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What Is Defi?

Cryptocurrency’s promise is to make money and payments universally accessible– to anyone, no matter where they are in the world.
The Decentralized Finance (DeFi) or Open Finance movement takes that promise a step further. Imagine a global, open alternative to every financial service you use today — savings, loans, trading, insurance and more — accessible to anyone in the world with a smartphone and internet connection.
This is now possible on smart contract blockchains, like Ethereum. “Smart contracts” are programs running on the blockchain that can execute automatically when certain conditions are met. These smart contracts enable developers to build far more sophisticated functionality than simply sending and receiving cryptocurrency. These programs are what we now call decentralized apps, or dapps.
You can think of a dapp as an app that is built on decentralized technology, rather than being built and controlled by a single, centralized entity or company. (Get used to this word, dapp, you’ll be seeing it a lot from here on out.)
While some of these concepts might sound futuristic–automated loans negotiated directly between two strangers in different parts of the world, without a bank in the middle– many of these dapps are already live today. There are DeFi dapps that allow you to create stablecoins (cryptocurrency whose value is pegged to the US dollar), lend out money and earn interest on your crypto, take out a loan, exchange one asset for another, go long or short assets, and implement automated, advanced investment strategies.

What differentiates these DeFi dapps from their traditional bank or Wall Street counterparts?

At their core, the operations of these businesses are not managed by an institution and its employees — instead the rules are written in code (or smart contract, as mentioned above). Once the smart contract is deployed to the blockchain, DeFi dapps can run themselves with little to no human intervention (although in practice developers often do maintain the dapps with upgrades or bug fixes).
The code is transparent on the blockchain for anyone to audit. This builds a different kind of trust with users, because anyone has the opportunity to understand the contract’s functionality or find bugs. All transaction activity is also public for anyone to view. While this may raise privacy questions, transactions are pseudonymous by default, i.e. not tied directly to your real-life identity.
Dapps are designed to be global from day one — Whether you’re in Texas or Tanzania, you have access to the same DeFi services and networks. Of course, local regulations may apply but, technically speaking, most DeFi apps are available to anyone with an internet connection.
Permissionless” to create, “permissionless” to participate — anyone can create DeFi apps, and anyone can use them. Unlike finance today, there are no gatekeepers or accounts with lengthy forms. Users interact directly with the smart contracts from their crypto wallets.
Flexible user experience — don’t like the interface to a certain dapp? No problem — you can use a third party interface, or build your own. Smart contracts are like an open API that anyone can build an app for.
Interoperable — new DeFi applications can be built or composed by combining other DeFi products like Lego pieces — e.g. stablecoins, decentralized exchanges, and prediction markets can be combined to form entirely new products.
DeFi is now one of the fastest growing sectors in crypto. Industry observers measure traction with a unique new metric — “ETH locked in DeFi”. At the time of writing, users have deposited over $600 million worth of crypto into these smart contracts.
Intrigued? Let’s take a closer look at just a few of the popular DeFi dapps out there that you can try today. You’ll need a cryptocurrency wallet with a built-in dapp browser (like Coinbase Wallet) to connect to these dapps. You can also use most of these dapps on desktop by selecting the Coinbase Wallet option and scanning a QR code.
It’s still early days for dapps, so DeFi users should do their research on new products and services. Like any computer code, smart contracts can be vulnerable to both unintended programming mistakes and malicious hacks.

Stablecoin and Decentralized Reserve Bank: MakerDAO

Maker is a stablecoin project where each stablecoin (called DAI) is pegged to the US Dollar and is backed by collateral in the form of crypto. Stablecoins offer the programmability of crypto without the downside of volatility that you see with “traditional” cryptocurrencies like Bitcoin or Ethereum.
You can try creating your own DAI stablecoin on the Maker Oasis dapp. Maker is more than just a stablecoin project, though–it aspires to be a decentralized reserve bank. People who hold a separate but related token, MKR, can vote on important decisions like the Stability Fee (similar to how the Federal Reserve’s Federal Open Market Committee votes on the Fed Funds rate).
Another stablecoin with a different architecture is USD Coin (USDC), where every USDC token is backed by one US dollar held in an audited bank account.
Borrow and Lend: Compound
Compound is a blockchain-based borrowing and lending dapp — you can lend your crypto out and earn interest on it. Or maybe you need some money to pay the rent or buy groceries, but your funds are tied up in your crypto investments? You can deposit your crypto to the Compound smart contract as collateral, and borrow against it. The Compound contract automatically matches borrowers and lenders, and adjusts interest rates dynamically based on supply and demand.
Other popular borrow/lend dapps are Dharma and dYdX. Aggregators like LoanScan track borrow/lend interest rates across the various dapps, so you can shop around for the best rates.
Automated Token Exchange: Uniswap
Uniswap is a cryptocurrency exchange run entirely on smart contracts, letting you trade popular tokens directly from your wallet. This is different from an exchange like Coinbase, which stores your crypto for you and holds your private keys for safekeeping. Uniswap uses an innovative mechanism known as Automated Market Making to automatically settle trades near the market price. In addition to trading, any user can become a liquidity provider, by supplying crypto to the Uniswap contract and earning a share of the exchange fees. This is called “pooling”.
Other popular Decentralized Exchange platforms (DEXes) include 0x, AirSwap, Bancor, Kyber, IDEX, Paradex and Radar Relay. All have slightly different architectures.
Prediction Markets: Augur
Augur is a decentralized prediction market protocol. With Augur, you can vote on the outcome of events, except you put ‘skin in the game’ by attaching a value to your vote. Prediction market platforms like Augur and Guesser are nascent, but offer a view into a future where users can make better predictions by tapping into the wisdom of the crowd.
Synthetic Assets: Synthetix
Synthetix is a platform that lets users create and exchange synthetic versions of assets like gold, silver, cryptocurrencies and traditional currencies like the Euro. The synthetic assets are backed by excess collateral locked into the Synthetix contracts.
No-loss savings games: PoolTogether
The composability of DeFi lends itself to infinite new possibilities. PoolTogether is a no-loss game where participants deposit the DAI stablecoin into a common pot. At the end of each month, one lucky participant wins all the interest earned, and everyone gets their initial deposits back.

So what’s next for DeFi?

Money and finance have been around in one form or the other since the dawn of human civilization. Crypto is just the latest digital avatar. In upcoming years, we might see every financial service that we use in today’s fiat system being rebuilt for the crypto ecosystem. We’ve already seen asset issuance and exchange, borrowing, lending, custody, and derivatives built for crypto. What’s next?
The first generation of DeFi dapps rely heavily on collateral as a safeguard. That is, you need to already own crypto and provide it as collateral in order to borrow more crypto. More traditional unsecured borrowing and lending will need to rely on an identity system, so that borrowers can build up credit and increase their borrowing power, much like today’s SSN and FICO scores. Unlike today’s identity and credit systems however, a decentralized identity will have to be both universal and privacy-preserving.
We’re also seeing innovation in the insurance space. Many of today’s DeFi loans are overcollateralized (meaning that loans seem inherently safe because of the generous cushion of assets held in reserve). But the black swan for DeFi is smart contract vulnerabilities. If a hacker finds and exploits a bug in the open source code for a dapp, millions of dollars could be drained in an instant. Teams like Nexus Mutual are building decentralized insurance that would make users whole in the event of smart contract hacks.
Another trend we’re seeing is better user experience. The first generation of dapps was built by blockchain enthusiasts for blockchain enthusiasts. These dapps did a great job of demonstrating exciting new DeFi possibilities, but the usability left something to be desired. The latest iterations of DeFi apps are prioritizing design and ease of use in order to take open finance to a wider audience.
In the future, we expect that crypto wallets will be the portal to all your digital asset activity, just like an internet browser today is your portal to the world’s news and information. Imagine a dashboard that shows you not just what assets you own, but how much you have locked up in different open finance protocols–loans, pools, and insurance contracts.
Across the DeFi ecosystem, we’re also seeing a move towards decentralizing governance and decision-making. Despite the word “decentralized” in DeFi, many projects today have master keys for the developers to shut down or disable dapps. This was done to allow for easy upgrades and provide an emergency shutoff valve in case of buggy code. However, as the code becomes more battle-tested, we expect developers will give up these backdoor switches. The DeFi community is experimenting with ways to allow stakeholders to vote on decisions, including through the use of blockchain-based Decentralized Autonomous Organizations (DAOs).
Something magical is happening in the open financial system — crypto is bringing money online, and we’re seeing a quantum leap in what’s possible when it comes to the functionality of money. It’s a rare opportunity to see an entirely new industry blossom from scratch. The DeFi space will at first play catch up with today’s financial services industry. But over time, it’s hard to even fathom what innovations will come about when the power to build financial services is democratized to anyone who can write code.
submitted by jakkkmotivator to Latest_Defi_News [link] [comments]

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eCommerce integrations | Coinbase Help {1-812-785-1006}
I sent funds to the wrong address. How do I get them back? | Coinbase Help {1-812-785-1006}
Why aren't sells available in my country? | Coinbase Help {1-812-785-1006}
Security keys FAQ | Coinbase Help {1-812-785-1006}
Why do I have to provide extra information when I send money? | Coinbase Help {1-812-785-1006}
Ethereum Classic (ETC) FAQ | Coinbase Help {1-812-785-1006}
I've installed a smartphone 2-factor app. How do I stop receiving SMS codes? | Coinbase Help {1-812-785-1006}
What is phishing? | Coinbase Help {1-812-785-1006}
Where is my Coinbase crypto address? | Coinbase Help {1-812-785-1006}
Is Coinbase present on social media? | Coinbase Help {1-812-785-1006}
How long does a sell or withdrawal take to complete? | Coinbase Help {1-812-785-1006}
Is a wallet address safe to display publicly? | Coinbase Help {1-812-785-1006}
I see the error "account temporarily disabled." What should I do? | Coinbase Help {1-812-785-1006}
What countries are buys and sells available in? | Coinbase Help {1-812-785-1006}
Invest responsibly: recommended account management practices | Coinbase Help {1-812-785-1006}
What is Litecoin? | Coinbase Help {1-812-785-1006}
How do I make a purchase using a 3D secure card on the mobile app? | Coinbase Help {1-812-785-1006}
What is ERC20? | Coinbase Help {1-812-785-1006}
How do I move assets between my Wallet and my Coinbase.com account? | Coinbase Help {1-812-785-1006}
Payments | Coinbase Help {1-812-785-1006}
Coinbase update on November 2018 BCH Hard Fork | Coinbase Help {1-812-785-1006}
What is Ethereum? | Coinbase Help {1-812-785-1006}
Why did Coinbase cancel my order? | Coinbase Help {1-812-785-1006}
Troubleshooting SEPA deposits and withdrawals | Coinbase Help {1-812-785-1006}
Why isn't my authy device recognized? | Coinbase Help {1-812-785-1006}
Trading rules | Coinbase Pro Help {1-812-785-1006}
Market summary | Coinbase Pro Help {1-812-785-1006}
OmiseGo (OMG) FAQ | Coinbase Pro Help {1-812-785-1006}
What is Bitcoin Cash? | Coinbase Pro Help {1-812-785-1006}
What is ERC20? | Coinbase Pro Help {1-812-785-1006}
What is Ethereum? | Coinbase Pro Help {1-812-785-1006}
Who at Coinbase can see my open orders? | Coinbase Pro Help {1-812-785-1006}
Email address verification | Coinbase Pro Help {1-812-785-1006}
What is margin trading? | Coinbase Pro Help {1-812-785-1006}
Does Coinbase use customer deposits for anything? | Coinbase Pro Help {1-812-785-1006}
What mobile devices does Coinbase support? | Coinbase Help {1-812-785-1006}
How does whitelisting in the address book work? | Coinbase Pro Help {1-812-785-1006}
How do I change my email address? | Coinbase Pro Help {1-812-785-1006}
Why didn't I receive a verification email? | Coinbase Pro Help {1-812-785-1006}
What two-step authentication apps can I use? | Coinbase Pro Help {1-812-785-1006}
Using and managing security keys | Coinbase Pro Help {1-812-785-1006}
Portfolios FAQ | Coinbase Pro Help {1-812-785-1006}
Funding your account with EUR | Coinbase Pro Help {1-812-785-1006}
What is phishing? | Coinbase Pro Help {1-812-785-1006}
Bitcoin Cash FAQ | Coinbase Pro Help {1-812-785-1006}
How can I disclose a security vulnerability to Coinbase? | Coinbase Pro Help {1-812-785-1006}
How does the address book work? | Coinbase Pro Help {1-812-785-1006}
How do I gain access to a deceased family members Coinbase account? | Coinbase Pro Help {1-812-785-1006}
Stellar Lumens (XLM) FAQ | Coinbase Pro Help {1-812-785-1006}
How does margin trading work on Coinbase? | Coinbase Pro Help {1-812-785-1006}
Applying to the correct Coinbase entity in your business application | Coinbase Pro Help {1-812-785-1006}
How to enable a webcam | Coinbase Pro Help {1-812-785-1006}
Is a wallet address safe to display publicly? | Coinbase Pro Help {1-812-785-1006}
XRP (XRP) FAQ | Coinbase Pro Help {1-812-785-1006}
Restoring 2-step verification from a secret seed | Coinbase Pro Help {1-812-785-1006}
How is my bank account information protected? | Coinbase Pro Help {1-812-785-1006}
Why did I receive an unexpected device confirmation email? | Coinbase Pro Help {1-812-785-1006}
0x FAQ | Coinbase Pro Help {1-812-785-1006}
Funding your account with USD | Coinbase Pro Help {1-812-785-1006}
Understanding your Margin Portfolio | Coinbase Pro Help {1-812-785-1006}
Ethereum Hard Fork | Coinbase Pro Help {1-812-785-1006}
How do I create an API key for Coinbase Pro | Coinbase Pro Help {1-812-785-1006}
Supported Cryptocurrencies | Coinbase Pro Help {1-812-785-1006}
What is the GDPR? | Coinbase Pro Help {1-812-785-1006}
Managing open orders | Coinbase Pro Help {1-812-785-1006}
What is Ethereum Classic? | Coinbase Pro Help {1-812-785-1006}
Algorand (ALGO) FAQ | Coinbase Pro Help {1-812-785-1006}
I see the error "account temporarily disabled." What should I do? | Coinbase Pro Help {1-812-785-1006}
Coinbase Bundles FAQ | Coinbase Pro Help {1-812-785-1006}
Coinbase pricing and fees disclosures | Coinbase Help {1-812-785-1006}
Where can I find the API documentation for Coinbase Pro? | Coinbase Pro Help {1-812-785-1006}
Bitcoin Gold FAQ | Coinbase Pro Help {1-812-785-1006}
Verifying your residential address | Coinbase Pro Help {1-812-785-1006}
Whats the difference between fix API and rest API? | Coinbase Pro Help {1-812-785-1006}
How to send and receive cryptocurrency | Coinbase Help {1-812-785-1006}
Phone-based attacks | Coinbase Help {1-812-785-1006}
Why will my password reset require 24 hours to process? | Coinbase Pro Help {1-812-785-1006}
Zcash (ZEC) FAQ | Coinbase Pro Help {1-812-785-1006}
What are the limits on Coinbase Pro? | Coinbase Pro Help {1-812-785-1006}
Does Coinbase freeze accounts? | Coinbase Pro Help {1-812-785-1006}
Tezos (XTZ) FAQ | Coinbase Pro Help {1-812-785-1006}
Account history and reports | Coinbase Pro Help {1-812-785-1006}
Password requirements | Coinbase Pro Help {1-812-785-1006}
ETH Byzantium Fork FAQ | Coinbase Pro Help {1-812-785-1006}
Is a 2-step verification code required for every login? | Coinbase Pro Help {1-812-785-1006}
Coinbase accounts-Hawaii | Coinbase Pro Help {1-812-785-1006}
Is Coinbase present on social media? | Coinbase Pro Help {1-812-785-1006}
Is this email really from Coinbase? | Coinbase Pro Help {1-812-785-1006}
How to contact Coinbase Pro support | Coinbase Pro Help {1-812-785-1006}
Avoiding cryptocurrency scams | Coinbase Pro Help {1-812-785-1006}
What is a transaction hash/hash ID? | Coinbase Pro Help {1-812-785-1006}
What are the eligibility requirements for US Margin Trading? | Coinbase Pro Help {1-812-785-1006}
Security keys FAQ | Coinbase Pro Help {1-812-785-1006}
How can I make my account more secure? | Coinbase Pro Help {1-812-785-1006}
Pro mobile app overview | Coinbase Pro Help {1-812-785-1006}
How can I close my account? | Coinbase Pro Help {1-812-785-1006}
How do I change my country or state? | Coinbase Pro Help {1-812-785-1006}
What is Litecoin? | Coinbase Pro Help {1-812-785-1006}
Signing up for a Coinbase Card | Coinbase Pro Help {1-812-785-1006}
Can I create a Coinbase Pro account in the name of a trust? | Coinbase Pro Help {1-812-785-1006}
How do I get a crypto address? | Coinbase Pro Help {1-812-785-1006}
What is Bitcoin? | Coinbase Pro Help {1-812-785-1006}
Best practices | Coinbase Pro Help {1-812-785-1006}
No verification link in email | Coinbase Pro Help {1-812-785-1006}
How does Coinbase use my ID? | Coinbase Pro Help {1-812-785-1006}
Address book and crypto withdrawal address whitelisting FAQ | Coinbase Pro Help {1-812-785-1006}
Coinbase User Margin Trading Agreement | Coinbase Pro Help {1-812-785-1006}
W8 information | Coinbase Pro Help {1-812-785-1006}
Submit a Complaint | Coinbase Help {1-812-785-1006}
Compound (COMP) FAQ | Coinbase Pro Help {1-812-785-1006}
Bankruptcy trustee guide | Coinbase Pro Help {1-812-785-1006}
SegWit FAQ | Coinbase Pro Help {1-812-785-1006}
Device confirmation troubleshooting | Coinbase Pro Help {1-812-785-1006}
How to send a complaint | Coinbase Pro Help {1-812-785-1006}
Reporting phishing sites | Coinbase Pro Help {1-812-785-1006}
Coinbase Money Transmission and e-Money Regulatory Compliance | Coinbase Pro Help {1-812-785-1006}
What is Coinbase card? | Coinbase Pro Help {1-812-785-1006}
Overview of the trade view | Coinbase Pro Help {1-812-785-1006}
Bitcoin glossary | Coinbase Pro Help {1-812-785-1006}
Bitcoin SegWit2x Fork FAQ for merchants | Coinbase Pro Help {1-812-785-1006}
Coinbase Tax Resource Center | Coinbase Pro Help {1-812-785-1006}
Security key restrictions | Coinbase Pro Help {1-812-785-1006}
Form 1099-K Tax Information for Coinbase Pro and Prime | Coinbase Pro Help {1-812-785-1006}
Funding your account with GBP | Coinbase Pro Help {1-812-785-1006}
Address formatting standards | Coinbase Custody Help
Who do I contact for a subpoena request or dispute or to send a legal document? | Coinbase Pro Help {1-812-785-1006}
Funding your account with cryptocurrency | Coinbase Pro Help {1-812-785-1006}
Why am I unable to upload my ID? | Coinbase Pro Help {1-812-785-1006}
EOS (EOS) FAQ | Coinbase Pro Help {1-812-785-1006}
ID document verification | Coinbase Pro Help {1-812-785-1006}
Bitcoin Fork FAQ | Coinbase Pro Help {1-812-785-1006}
International support | Coinbase Pro Help {1-812-785-1006}
International support for Coinbase Pro | Coinbase Pro Help {1-812-785-1006}
Ethereum Classic (ETC) FAQ | Coinbase Pro Help {1-812-785-1006}
Destination Tag/memo FAQ | Coinbase Pro Help {1-812-785-1006}
Coinbase update on November 2018 BCH Hard Fork | Coinbase Pro Help {1-812-785-1006}
Orchid FAQ | Coinbase Pro Help {1-812-785-1006}
Payment methods for US customers | Coinbase Help {1-812-785-1006}
DAI FAQ | Coinbase Pro Help {1-812-785-1006}
Coinbase Help {1-812-785-1006}
CashAddr FAQ | Coinbase Pro Help {1-812-785-1006}
How to open a Coinbase Pro account | Coinbase Pro Help {1-812-785-1006}
Coinbase Custody Help
How to access privacy settings and make requests | Coinbase Pro Help {1-812-785-1006}
Managing Google Authenticator | Coinbase Pro Help {1-812-785-1006}
Stellar Lumens (XLM) FAQ | Coinbase Help {1-812-785-1006}
Supported cryptocurrencies | Coinbase Pro Help {1-812-785-1006}
API developer terms | Coinbase Pro Help {1-812-785-1006}
2-step verification FAQ | Coinbase Help {1-812-785-1006}
How can I update my legal name? | Coinbase Pro Help {1-812-785-1006}
How do I set up 2-factor authentication? | Coinbase Pro Help {1-812-785-1006}
Lost email access | Coinbase Pro Help {1-812-785-1006}
FAQ on API | Coinbase Pro Help {1-812-785-1006}
Applying for a Coinbase business account | Coinbase Pro Help {1-812-785-1006}
Bitcoin SV FAQ | Coinbase Pro Help {1-812-785-1006}
How to withdraw funds from a closed account | Coinbase Pro Help {1-812-785-1006}
I can't remember my password | Coinbase Pro Help {1-812-785-1006}
Slippage warning | Coinbase Pro Help {1-812-785-1006}
How do I verify my identity when using the mobile app? | Coinbase Help {1-812-785-1006}
Margin Trading FAQ | Coinbase Pro Help {1-812-785-1006}
Where can I spend Bitcoin? | Coinbase Pro Help {1-812-785-1006}
What is the Bitcoin Blockchain? | Coinbase Pro Help {1-812-785-1006}
Invest responsibly: recommended account management practices | Coinbase Pro Help {1-812-785-1006}
Privacy data request FAQ | Coinbase Pro Help {1-812-785-1006}
Landlines and 2-step verification | Coinbase Pro Help {1-812-785-1006}
Reset my password | Coinbase Pro Help {1-812-785-1006}
I have lost or need to update my phone or 2-step verification device | Coinbase Pro Help {1-812-785-1006}
Is Bitcoin secure? Has this network ever been hacked? | Coinbase Pro Help {1-812-785-1006}
Account recovery FAQ | Coinbase Pro Help {1-812-785-1006}
Dash (DASH) FAQ | Coinbase Pro Help {1-812-785-1006}
Cosmos (ATOM) FAQ | Coinbase Pro Help {1-812-785-1006}
Verifying your identity | Coinbase Pro Help {1-812-785-1006}
How is Coinbase insured? | Coinbase Pro Help {1-812-785-1006}
Minimum age requirement | Coinbase Pro Help {1-812-785-1006}
What is a Bitcoin wallet? | Coinbase Pro Help {1-812-785-1006}
Adding a payment method | Coinbase Pro Help {1-812-785-1006}
Basic Attention Token FAQ | Coinbase Pro Help {1-812-785-1006}
Prohibited regions | Coinbase Pro Help {1-812-785-1006}
Coinbase Pro Help {1-812-785-1006}
2-step verification FAQ | Coinbase Pro Help {1-812-785-1006}
Kyber (KNC) 101 | Coinbase Pro Help {1-812-785-1006}
Using Destination Tag on Coinbase Pro | Coinbase Pro Help {1-812-785-1006}
Does Coinbase Pro support smart contracts? | Coinbase Pro Help {1-812-785-1006}
Phone-based attacks | Coinbase Help {1-812-785-1006}
What are the eligibility requirements for US Margin Trading? | Coinbase Pro Help {1-812-785-1006}
submitted by PersonalDoctor to u/PersonalDoctor [link] [comments]

Coinbase account was hacked

Here are the details: I was using an 18 character randomly generated password (that I've just changed). And I had 2-factor authentication enabled via SMS to my phone. My passwords are stored in 1Password with a very long long master password that is not reused.
20 minutes ago I received an email from Coinbase saying that my entire account balance had been transferred to the following Bitcoin address: 1ApNaCE43dF1Ltw391cXsw2CKQEMAR3Yeo.
After logging into my account, I found a purchase order had also been made for 5 Bitcoins drawing from my bank account.
I've contacted Coinbase for support, but it's the middle of the night on a weekend so I doubt I'll be hearing from them anytime soon. In the meantime, I've changed my Coinbase password and removed the bank account, credit card, and billing info that was saved in it.
Since I have no reason to suspect my 1Password vault was compromised (nothing else has been messed with), I just thought I'd warn everyone that Coinbase may have a vulnerability (especially as whoever did this also bypassed the 2 factor).
Edit: Coinbase contacted me almost 2 hours after submitting my initial report, which I consider to be pretty fast for a request sent in the middle of the night. They've canceled the purchase for 5 BTC, though they didn't mention the amount that was stolen (I know I'm probably not going to get that back). They did confirm that the hacker gained access to the account via the API key.
However, I created the key a while ago on a whim (something I now realize was not the best idea) and never used it for anything or with anything. It was never stored outside of Coinbase. So I think it was probably compromised by a vulnerability at Coinbase (brute force, maybe?).
Fortunately, it's an easy fix. Disable the API key and the account is safe again. I just wish I hadn't paid $500 to learn that...
Edit 2: Coinbase said the IP address of the person who got the API key is: 194.158.204.194.
submitted by goodnews_everybody to Bitcoin [link] [comments]

So I finally gave Honeyminer a try. (my personal semi-review)

This review was last updated 11-30-18
When I first was interested in trying this program I couldn't find anything about it. it seems a lot of people were too scared to try it since their is like no information about it other then from the web page itself. to be honest I was a bit scared to try it. I've tried many other software of this kind, on a "test" machine I'm not afraid to lose on a secondary network and router... incase its a scam or gonna give me a virus and I suggest anyone installing mining software do the same as a rule of thumb. please keep in mind the software is still relatively new and they are working to improve it still. They seem to be hiring as well if your interested in helping them grow by working for them look near the bottom for their contact e-mail. ____________________________________________________________________________________________________
This review is for the windows version of Honyminer Because its still relatively new I knew could go one of two ways "sacm software" like most every mobile mining app or even quite a few desktop ones - Or legit. I'm glad to say after using it for a month it seems legit. I was able to withdraw from it no problem. If your system is really crappy It might not work that well on your computer or mining rig. There are no ads and the program doesn't seem to disrupt any day to day activity at least not on my main system, however you can of course expect increased heat production of your system as with any mining software, adequate cooling is important in mining. Anyways Honyminer is as close to an easy one click mining software as I have come. they seem to be making a "pro" version too for more hardcore miners. They do take a fee which is to be expected *look near the bottom for fee information\* but that fee goes down significantly if you have multiple GPU's mining.. The good thing about it for me was it let me kind of set my rig to "autopilot" so to speak. If you wish to see the H/s numbers in real time, go to you settings and view the "expert logs" which will also tell what coin is being mined at the time ____________________________________________________________________________________________________________
Pros
Pro and or con (depending on how you look at it)
Cons:
_________________________________________________________________________________________________
COMPATIBILITY: (sorry it keeps adding asterisks to the card model for no reason)
WORKED ON: every nvidia card tested so far with card models dating back from 20014 to now..
Worked on some surprising low end and or old CPU and GPUs. like the
AMD Radeon R9 380 card in addition to a AMD Athlon II X3 450 Processor and it mines just fine.. of course that processor doesn't make much on its own lol.. but thats an extra 2 or 3 cents per day by itself. I've also tested it with an i3, i2 Most AMD cards worked but I ran into issues with a few so maybe it's easier for me to just tell you what did not work.
DID NOT WORK ON:
--- any of the AMD ATI Radeon HD 4250's tested so far (2) that particular card It didn't work at all for mining like never enabled the gpu but the cpu on that machine did work however it would generate an "error" on start up but otherwise did not disrupt the mining on that system except if I turned on idle earning mode, I would get a bunch of errors as it was trying to access the GPU. we need the functionality to enable or disable hardware individually I think. (errors or no errors it just seems like a good thing to have.)
OR a system that had both a AMD Radeon R7 Graphics and a AMD A8-7650K Radeon R7, (4C+6G) which surprised me considering some of the things that did work lol... but I think it might just might be that one system, but either way can't vouch that it will work. That system was pre-built and wont allow the parts to be changed or easily removed to be worth the effort since I have to use it for other things so unfortunately I can't test these on another mainboard at least not with wasting some time, money and patients that Id rather dedicate elsewhere for now.
I had some issues using one RX Vega 56 card but i think it's was just that card because another one did work just fine.________________________________________________________________________
FEES W/ comparison to nicehash
I'm not sure if this post will be helpful to anyone looking into this software or anyone whos looking to try a different mining software but if it dose great.
-- nicehash charges the following fees as far as "selling/mining" or withdrawing.
Payouts for balances less than 0.1 to external wallet 5%
Payouts for balances greater than or equal to 0.1 BTC to external wallet 3%
Payouts for balances greater than or equal to 0.001 BTC to NiceHash wallet 2%
Withdrawal fees from NiceHash wallet
Withdrawals from NiceHash wallet are subjected to the withdrawal fee, which depends on the withdrawn amount and withdrawal option.
WITHDRAWAL OPTION AMOUNT TO WITHDRAW FEE Any BTC wallet From 0.002 (min) to 0.05 BTC 0.0001 BTC
Any BTC wallet More than 0.05 BTC 0.2% of withdrawn amount
Coinbase More than 0.001 BTC FREE - No fee. but they also say Minimum Coinbase withdrawal limit is adjusted dynamically according to the API overload._____________________________________________________________________________
honyminer fees are based on number of GPU's working.
8% for 1 GPU or for 2 GPUs or more the fee is 2.5%.
The only withdrawal fee is the standard BTC transaction fee that bitcoin charges and it doesn't go to honyminer. When they add the other withdrawal functions that fee cam be avoided I suppose.
_________________________
Earnings: in comparison to nicehash
Update: sometimes software / test networks will give a view that can be off + or - a few percent compared to actual. A lot of different things can affect your earnings including where you are located in the world, I'm not sure how many of you uses more than one mining software day to day , ISP issues, crypto price fluctuation, updates to fee's, and inaccuracies in test software/networks can affect results. but I go back and forth between different ones from time to time and I think that's good practice to keep options open. I notice that honey miner seems to do better for me at night-time and early morning/afternoon is when it has the most trouble raking in the crypto's
That said I've been trying to test to see how this compares to nice hash earnings, with two of my buddies. So this is an average between the 3 of our profits vs loss compared to nice hash, I'm using a two 10 GPU/ 3 cpu setups, while one of my buddies is using two 1 gpu, 2 cpu setups and the other is using two 30 gpu mini farm's. We each have 2 networks each located relatively close by *less than .5 mile the furthest one* one with honyminer running and the other with nice hash and we are looking over 24 hour periods When all three of us have the results for one day, we average our results together. In all we will be looking over a 14 day period. UPDATE: the results below were done well long before the latest update to the software so I do not know if they have changed, Id have to do another round or perhaps some from the community could give me their results and save me a bit of work. I'm not sure when Id have the time to dig into it again. Sorry that it took me so long before I could get on here to post the results of the last few days of the tests.
Seem to be a bit smaller then nicehash at times and higher at other times. it seems to for me at least payquicker and it gets deposited in my nicehash account sooner than I expected.
hopefully when they let up pick which coin to mine on our own it may help somewhat, and any of you who want to move smaller volume will probably benefit when they add the functionality to withdraw other coin/usd.
anyways when their autopilot system works it works great but when it doesn't it's just "okay" for lack of a better word...
_____________________________________________________
Contact: they have a contact us part on their webpage and they also have a reddit page which I was made aware of from contacting them https://www.reddit.com/HoneyMine
Careers: If anyone is interested in working for them the job listings at the time of this typing were for Senior Java Developer(s) and Customer Service Representative(s) the email listed is [[email protected]](mailto:[email protected]). id suggest you check their site for the requirements I just added this part to the review as a courtesy if anyone's interested its not meant to be a focus of it. But I know we have some really talented people on reddit who care about the crypto world passionately so id rather give honyminer a chance to have some of those sort on their team since it might help improve the software faster for the end users.. if that makes sense.
_________________________________________________________
UPDATE: If a question reminds me I left out something I think should have mentioned Ill try to add it here so ppl don't have to scroll all over the place.. I don't write many reviews (for anything) so I don't know if this one was any good or not but I hope it was okay.. and I'm still a new reddit user relatively. I just wanted to make this review mainly because there is next to no information on honyminer when I looked for it and maybe it can help anyone whos interested in it.
browolf2 asked Is it basically like nicehash then? :
A: In a way, its like nice hash that its cloud based, but you get paid not just when your pool completes an order. there are no "buyers" only "sellers" if you look at it that way...I hope I'm wording this the right way.. It's just straight up mining and they take their fee but compared to nicehash the fees for "mining" are different
karl0525 asked: do you know if we can contact the honeyminer dev team and see if they will communicate here on Reddit. Might give them some good ideas what us miners are looking for? Worth a try maybe? Thanks:
A: I submitted a question to their "contact us" part of their webpage and I got a reply from them, this is the message I received below:
Thank you for writing in and for your interest in Honeyminer. We always welcome feedback and suggestions from our users. We are currently planning on expanding our online and social media presence.
Please check our our Reddit page: https://www.reddit.com/HoneyMine
submitted by Joe_Cow to gpumining [link] [comments]

Account Closure - Violation of Terms of Service???

I received a very disturbing email from coinbase stating that they closed my account for violating terms of service. I have no idea how it could be possible because I haven't been selling, just buying using Coinbase Pro only, not coinbase.

The only thing I can think of is that I use the coinbase API with cointracking.info which is tax-related software that queries the coinbase api (read-only) each and every day automatically.

So now when I sign in to coinbase pro it redirects me to coinbase account closure page https://www.coinbase.com/close_account and says I have no balance but my balance is in Coinbase Pro, not Coinbase and I have no way to access it because visiting coinbase pro keeps redirecting me back to account closure page.

Two problems I have
  1. I have no idea why coinbase closed my account because I have done nothing deliberate against terms of service
  2. Cannot gain access to my assets because my assets are in Coinbase Pro, not Coinbase.
I'm just so bewildered as to why they could think I have been violating their terms of service when I've been only buying (not selling) bitcoin recently. If the problem was the api from cointracking.info will they allow me to keep my coinbase account open? I have now just disabled cointracking.info


submitted by DigitalMan76 to CoinBase [link] [comments]

Authy Is an awesome App - BUT there is one major security flaw.

tl;dr: Authy is flawed in that it's own native tokens are not as well protected as Google Authenticator / RFC 6238 tokens that you can add
Preface
I see Authy getting recommended a lot here, and as one of the major supporters of this app, I couldn't be happier because I really do believe in having a good system of security that not only allows us to adopt better security (implementing 2FA for all our accounts), but to also do so without a loss in convenience (cloud backups). However, I do have to point out that one of its major flaws is that it doesn't protect Authy tokens with the same security it does with RFC 6238 / Google Authenticator tokens. I'll explain a little more in my post below, but let me first run through the details of Authy.
Authy's Security Model
I've always respected this model because it's a lot like LastPass' where your data is encrypted by a key that only you know. I studied this quite a bit and was impressed by their use of this concept. It gives me reassurance that accounts are protected and moreover by a password that only I know. Authy even explains it in a lot of detail here to tell us how secure the backup passwords are.
Authy Tokens vs RFC 6238 TOTP Tokens
Authy was originally made as an 2FA API itself. Now as a disclaimer, I'm not a software expert or anything, so I'm stepping on thin ice here in my discussion, but it seems Authy has its own token system that's slightly different from Google Authenticator / RFC 6238.
As one of the early users of Coinbase, they partnered up with Authy for 2FA initially, so all you had to do was tie your phone number to Coinbase and Authy and it would enable the Authy token automatically. A few other services today continue to use Authy tokens (Gemini, Twitch, Twilio obviously, BitGo, and maybe a few select others). The problem I noticed was that these tokens are separate from Google Authenticator / RFC 6238 tokens that you typically add through a QR code or a seed phrase.
The Problem
These Authy tokens are NOT protected by the backup password that your other tokens are that you manually add via QR code..
Now you might not understand what an Authy token is, so feel free to look at those links for Gemini, Twitch, and Twilio that I posted above. You will notice that the setup involves typing in your phone number rather than a QR code. Since Authy also has your phone #, giving your number basically adds that token to your Authy account by linking the two together using that identifier. You may also notice that these Authy tokens are 7 digits instead of your typical 6 digit 2FA codes.
How to Replicate the Problem
What I hate more than anything else about PSAs is the people posting issues that only affect them, and don't do proper debugging to even reproduce the problem. While I thought I discovered this issue a while ago, I didn't make this post until I finally sat down and spent some time playing with multiple phones, tablets, computers, and accounts. I went ahead and tried this not only on my account but setting up a dummy account and confirmed both times that Authy tokens really aren't protected by a password. I encourage you to try the following steps:
  1. Setup a new Authy instance either on a new phone/tablet or Chrome. Or if you already have Authy on every device, just remove it from one and try setting it up again.
  2. Confirm your new device via an old device or via SMS
  3. Open up Authy and look for your Authy Tokens. I'll show you my Authy screen, This was a brand new laptop I had just setup and installed Chrome. You can notice that all my Google Authenticator tokens are LOCKED. I need to type in my backup password before I can even use those tokens. But BitGo there is an Authy token. It's fully unlocked. I can click on it without typing any password.
What's the problem with this?
Well I've seen many recommendations for Authy offer reassurance that even if your SMS is spoofed/hacked, that a hacker still needs a password to access your 2FA tokens. NOT ENTIRELY TRUE!!!!
Your Google Authenticator tokens will be protected by the secure backup passwords but your Authy tokens will not be. I'm going to guess this is why Coinbase started migrating over to Google Authenticator instead of defaulting to Authy due to the threat of SMS being so easily hijacked.
Damage Control
So because your Authy accounts can be accessed w/o a password, anyone who can intercept your SMS codes can get access to your Authy accounts. The best way to mitigate the damage is to disable the "Allow Multi Device" setting in the Coinbase app. This prevents any other user from setting up new Authy devices with your account. Turn it on when you need to setup a new phone/device, but turn it off immediately after.
While this seems to prevent anything bad from happening, it's a band-aid solution. Authy's tokens may be encrypted on their servers, but it's certainly not encrypted with a password that only you know (it's either that or they know your backup password in reality). It would seem if someone hacked their servers, that they could get control of your Authy tokens even if your Google Authenticator accounts are still protected. So in conclusion this puts in doubt their backup password security explainer:
This means that if our servers were to be compromised, no hacker would be able to steal your tokens unless he also knew your backups password.
submitted by dlerium to CryptoCurrency [link] [comments]

DogNZB invites discontinued for the time being

Dog has discontinued invites for the time being so asking for them won't do you any good. If this changes let the mod team know and we'll remove this message. Here is the message posted from Dog a few weeks ago:
>Ok, so I have some bad news. I'll get right to the point. Lifetime access as you know it will be changing. This was a hard decision to make, it's not easy going back on something previously offered, but the fact of the matter is the site is becoming hard to sustain with the current model, and just keeping registrations opened, and letting new users sign-up is not a good idea. The costs of operating, hosting, running and updating 6 servers are significant.
>I know probably a large majority of the user base will be alienated right of the bat, but what is the alternative? To close up a site that is unable to sustain itself in 6-12 months.
>So better to make the changes now, keep the current user base, and go back to keeping a low profile.
>So starting today, registrations are closed. Invites will come back in some form next year. An annual membership needs to be paid to have full access to all our features, and DOGpass subscriptions will be eliminated (all former DOGpass functionality will now be available to every member).
> In both cases, please check your profile pages for information on your updated expiration date. When the current subscription expires, any user that decides NOT TO renew their premium subscription will be moved to a LITE tier. Access to the website will still be possible, but daily download quota and API calls will be considerably limited, Watchlists and Custom Searches will be disabled, as well as IMDb and Trakt sync.
> You will still have lifetime access to the site, accounts will NOT be purged, but it will be a 'lite' account (perfect for occasional use, or for people that use us primarily as a backup).
> What does this mean for current users? It basically depends on when you originally registered.
> For members that registered after December 1st 2014, your lifetime payment, will be converted to a 1 year subscription, starting on the date of your registration. If you were also a DOGpass member your expiration dates will be increased by an additional year.
>If you registered before December 1st 2014, your subscriptions will expire on the same month/day of your registration, so expirations will be staggered during the next 12 months. If you're were also a DOGpass member, you will retain your current expiration date.
> Pricing is the same as DOGpass was: $15 for 1 year, $35 for 3 years, and $50 for 5 years. For now, payment still involves a third party website that manages the transactions for an extra $10 service charge (included with the cost of the T-Shirt). Unfortunately, I've been vocal here in the past about the problems we've had with PayPal, Coinbase etc. So it's better to just do a 3 or 5 year extension if you can.
> Bitcoin payments are also possible at this moment. We are looking into other payment alternatives.
> For users that registered recently (last 60 days), your expiration date has been bumped up manually. Also users that have separately donated in the past, you can contact any staff member for instructions on how to get bumped up also.
> These features, previously available only for DOGpass users, are now available for everyone: Exclusive regex rules and deobfuscation algorithms result in additional NZBs available Fine tune your Watchlist delay setting and retention limits. Sync from IMDb and Trakt watchlists every 60 minutes Trigger metadata refresh of any TV show or Movie Push notifications alerts to your mobile phone. iCal feeds of your TV Show Watchlist. Custom Searches and RSS feeds updated hourly. Passthrough and Emulation APIs for mobile phones. Primary and Secondary Push Queues. View NZB contents and perform partial downloads. Mobile Website Interface I understand this will not be a popular decision, and I expect a lot of complaints. But please try to understand, we are trying to make things work in the long run.
submitted by stufff to UsenetInvites [link] [comments]

Relative CHECKLOCKTIMEVERIFY (was CLTV proposal) | Matt Corallo | Mar 16 2015

Matt Corallo on Mar 16 2015:
In building some CLTV-based contracts, it is often also useful to have a
method of requiring, instead of locktime-is-at-least-N,
locktime-is-at-least-N-plus-the-height-of-my-input. ie you could imagine
an OP_RELATIVECHECKLOCKTIMEVERIFY that reads (does not pop) the top
stack element, adds the height of the output being spent and then has
identical semantics to CLTV.
A slightly different API (and different name) was described by maaku at
http://www.reddit.com/Bitcoin/comments/2z2l91/time_to_lobby_bitcoins_core_devs_sf_bitcoin_devs/cpgc154
which does a better job of saving softfork-available opcode space.
There are two major drawbacks to adding such an operation, however.
1) More transaction information is exposed inside the script (prior to
CLTV we only had the sigchecking operation exposed, with a CLTV and
RCLTV/OP_CHECK_MATURITY_VERIFY we expose two more functions).
2) Bitcoin Core's mempool invariant of "all transactions in the mempool
could be thrown into one overside block and aside from block size, it
would be valid" becomes harder to enforce. Currently, during reorgs,
coinbase spends need checked (specifically, anything spending THE
coinbase 100 blocks ago needs checked) and locktime transactions need
checked. With such a new operation, any script which used this new
opcode during its execution would need to be re-evaluated during reorgs.
I think both of these requirements are reasonable and not particularly
cumbersome, and the value of such an operation is quite nice for some
protocols (including settings setting up a contest interval in a
sidechain data validation operation).
Thoughts?
Matt
On 10/01/14 13:08, Peter Todd wrote:
I've written a reference implementation and BIP draft for a new opcode,
CHECKLOCKTIMEVERIFY. The BIP, reproduced below, can be found at:
https://github.com/petertodd/bips/blob/checklocktimeverify/bip-checklocktimeverify.mediawiki
The reference implementation, including a full-set of unittests for the
opcode semantics can be found at:
https://github.com/petertodd/bitcoin/compare/checklocktimeverify

BIP:
Title: OP_CHECKLOCKTIMEVERIFY
Author: Peter Todd <pete at petertodd.org>
Status: Draft
Type: Standards Track
Created: 2014-10-01

==Abstract==
This BIP describes a new opcode (OP_CHECKLOCKTIMEVERIFY) for the Bitcoin
scripting system that allows a transaction output to be made unspendable until
some point in the future.
==Summary==
CHECKLOCKTIMEVERIFY re-defines the existing NOP2 opcode. When executed it
compares the top item on the stack to the nLockTime field of the transaction
containing the scriptSig. If that top stack item is greater than the transation
nLockTime the script fails immediately, otherwise script evaluation continues
as though a NOP was executed.
The nLockTime field in a transaction prevents the transaction from being mined
until either a certain block height, or block time, has been reached. By
comparing the argument to CHECKLOCKTIMEVERIFY against the nLockTime field, we
indirectly verify that the desired block height or block time has been reached;
until that block height or block time has been reached the transaction output
remains unspendable.
==Motivation==
The nLockTime field in transactions makes it possible to prove that a
transaction output can be spent in the future: a valid signature for a
transaction with the desired nLockTime can be constructed, proving that it is
possible to spend the output with that signature when the nLockTime is reached.
An example where this technique is used is in micro-payment channels, where the
nLockTime field proves that should the receiver vanish the sender is guaranteed
to get all their escrowed funds back when the nLockTime is reached.
However the nLockTime field is insufficient if you wish to prove that
transaction output ''can-not'' be spent until some time in the future, as there
is no way to prove that the secret keys corresponding to the pubkeys controling
the funds have not been used to create a valid signature.
===Escrow===
If Alice and Bob jointly operate a business they may want to
ensure that all funds are kept in 2-of-2 multisig transaction outputs that
require the co-operation of both parties to spend. However, they recognise that
in exceptional circumstances such as either party getting "hit by a bus" they
need a backup plan to retrieve the funds. So they appoint their lawyer, Lenny,
to act as a third-party.
With a standard 2-of-3 CHECKMULTISIG at any time Lenny could conspire with
either Alice or Bob to steal the funds illegitimately. Equally Lenny may prefer
not to have immediate access to the funds to discourage bad actors from
attempting to get the secret keys from him by force.
However with CHECKLOCKTIMEVERIFY the funds can be stored in scriptPubKeys of
the form:
IF  CHECKLOCKTIMEVERIFY DROP  CHECKSIGVERIFY 1 ELSE 2 ENDIF   2 CHECKMULTISIG 
At any time the funds can be spent with the following scriptSig:
  0 
After 3 months have passed Lenny and one of either Alice or Bob can spend the
funds with the following scriptSig:
  1 
===Non-interactive time-locked refunds===
There exist a number of protocols where a transaction output is created that
the co-operation of both parties to spend the output. To ensure the failure of
one party does not result in the funds becoming lost refund transactions are
setup in advance using nLockTime. These refund transactions need to be created
interactively, and additionaly, are currently vulnerable to transaction
mutability. CHECKLOCKTIMEVERIFY can be used in these protocols, replacing the
interactive setup with a non-interactive setup, and additionally, making
transaction mutability a non-issue.
====Two-factor wallets====
Services like GreenAddress store Bitcoins with 2-of-2 multisig scriptPubKey's
such that one keypair is controlled by the user, and the other keypair is
controlled by the service. To spend funds the user uses locally installed
wallet software that generates one of the required signatures, and then uses a
2nd-factor authentication method to authorize the service to create the second
SIGHASH_NONE signature that is locked until some time in the future and sends
the user that signature for storage. If the user needs to spend their funds and
the service is not available, they wait until the nLockTime expires.
The problem is there exist numerous occasions the user will not have a valid
signature for some or all of their transaction outputs. With
CHECKLOCKTIMEVERIFY rather than creating refund signatures on demand
scriptPubKeys of the following form are used instead:
IF  CHECKSIGVERIFY ELSE  CHECKLOCKTIMEVERIFY DROP ENDIF  CHECKSIG 
Now the user is always able to spend their funds without the co-operation of
the service by waiting for the expiry time to be reached.
====Micropayment Channels====
Jeremy Spilman style micropayment channels first setup a deposit controlled by
2-of-2 multisig, tx1, and then adjust a second transaction, tx2, that spends
the output of tx1 to payor and payee. Prior to publishing tx1 a refund
transaction is created, tx3, to ensure that should the payee vanish the payor
can get their deposit back. The process by which the refund transaction is
created is currently vulnerable to transaction mutability attacks, and
additionally, requires the payor to store the refund. Using the same
scriptPubKey from as in the Two-factor wallets example solves both these issues.
===Trustless Payments for Publishing Data===
The PayPub protocol makes it possible to pay for information in a trustless way
by first proving that an encrypted file contains the desired data, and secondly
crafting scriptPubKeys used for payment such that spending them reveals the
encryption keys to the data. However the existing implementation has a
significant flaw: the publisher can delay the release of the keys indefinitely.
This problem can be solved interactively with the refund transaction technique;
with CHECKLOCKTIMEVERIFY the problem can be non-interactively solved using
scriptPubKeys of the following form:
IF HASH160  EQUALVERIFY  CHECKSIG ELSE  CHECKLOCKTIMEVERIFY DROP  CHECKSIG ENDIF 
The buyer of the data is now making a secure offer with an expiry time. If the
publisher fails to accept the offer before the expiry time is reached the buyer
can cancel the offer by spending the output.
===Proving sacrifice to miners' fees===
Proving the sacrifice of some limited resource is a common technique in a
variety of cryptographic protocols. Proving sacrifices of coins to mining fees
has been proposed as a ''universal public good'' to which the sacrifice could
be directed, rather than simply destroying the coins. However doing so is
non-trivial, and even the best existing technqiue - announce-commit sacrifices
create outputs that are provably spendable by anyone (thus to mining fees
assuming miners behave optimally and rationally) but only at a time
sufficiently far into the future that large miners profitably can't sell the
sacrifices at a discount.
===Replacing the nLockTime field entirely===
As an aside, note how if the SignatureHash() algorithm could optionally cover
part of the scriptSig the signature could require that the scriptSig contain
CHECKLOCKTIMEVERIFY opcodes, and additionally, require that they be executed.
(the CODESEPARATOR opcode came very close to making this possible in v0.1 of
Bitcoin) This per-signature capability could replace the per-transaction
nLockTime field entirely as a valid signature would now be the proof that a
transaction output ''can'' be spent.
==Detailed Specification==
Refer to the reference implementation, reproduced below, for the precise
semantics and detailed rationale for those semantics.
case OP_NOP2: { // CHECKLOCKTIMEVERIFY // // (nLockTime -- nLockTime ) if (!(flags & SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY)) break; // not enabled; treat as a NOP if (stack.size() < 1) return false; // Note that elsewhere numeric opcodes are limited to // operands in the range -2**31+1 to 2**31-1, however it is // legal for opcodes to produce results exceeding that // range. This limitation is implemented by CScriptNum's // default 4-byte limit. // // If we kept to that limit we'd have a year 2038 problem, // even though the nLockTime field in transactions // themselves is uint32 which only becomes meaningless // after the year 2106. // // Thus as a special case we tell CScriptNum to accept up // to 5-byte bignums, which are good until 2**32-1, the // same limit as the nLockTime field itself. const CScriptNum nLockTime(stacktop(-1), 5); // In the rare event that the argument may be < 0 due to // some arithmetic being done first, you can always use // 0 MAX CHECKLOCKTIMEVERIFY. if (nLockTime < 0) return false; // There are two times of nLockTime: lock-by-blockheight // and lock-by-blocktime, distinguished by whether // nLockTime < LOCKTIME_THRESHOLD. // // We want to compare apples to apples, so fail the script // unless the type of nLockTime being tested is the same as // the nLockTime in the transaction. if (!( (txTo.nLockTime < LOCKTIME_THRESHOLD && nLockTime < LOCKTIME_THRESHOLD) || (txTo.nLockTime >= LOCKTIME_THRESHOLD && nLockTime >= LOCKTIME_THRESHOLD) )) return false; // Now that we know we're comparing apples-to-apples, the // comparison is a simple numeric one. if (nLockTime > (int64_t)txTo.nLockTime) return false; // Finally the nLockTime feature can be disabled and thus // CHECKLOCKTIMEVERIFY bypassed if every txin has been // finalized by setting nSequence to maxint. The // transaction would be allowed into the blockchain, making // the opcode ineffective. // // Testing if this vin is not final is sufficient to // prevent this condition. Alternatively we could test all // inputs, but testing just this input minimizes the data // required to prove correct CHECKLOCKTIMEVERIFY execution. if (txTo.vin[nIn].IsFinal()) return false; break; } 
https://github.com/petertodd/bitcoin/commit/ab0f54f38e08ee1e50ff72f801680ee84d0f1bf4
==Upgrade and Testing Plan==
TBD
==Credits==
Thanks goes to Gregory Maxwell for suggesting that the argument be compared
against the per-transaction nLockTime, rather than the current block height and
time.
==References==
PayPub - https://github.com/unsystem/paypub
Jeremy Spilman Micropayment Channels - http://www.mail-archive.com/bitcoin-development%40lists.sourceforge.net/msg02028.html
==Copyright==
This document is placed in the public domain.
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original: http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-March/007714.html
submitted by bitcoin-devlist-bot to bitcoin_devlist [link] [comments]

Bitcoin Core 0.10.0 released | Wladimir | Feb 16 2015

Wladimir on Feb 16 2015:
Bitcoin Core version 0.10.0 is now available from:
https://bitcoin.org/bin/0.10.0/
This is a new major version release, bringing both new features and
bug fixes.
Please report bugs using the issue tracker at github:
https://github.com/bitcoin/bitcoin/issues
The whole distribution is also available as torrent:
https://bitcoin.org/bin/0.10.0/bitcoin-0.10.0.torrent
magnet:?xt=urn:btih:170c61fe09dafecfbb97cb4dccd32173383f4e68&dn;=0.10.0&tr;=udp%3A%2F%2Ftracker.openbittorrent.com%3A80%2Fannounce&tr;=udp%3A%2F%2Ftracker.publicbt.com%3A80%2Fannounce&tr;=udp%3A%2F%2Ftracker.ccc.de%3A80%2Fannounce&tr;=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr;=udp%3A%2F%2Fopen.demonii.com%3A1337&ws;=https%3A%2F%2Fbitcoin.org%2Fbin%2F
Upgrading and downgrading

How to Upgrade
If you are running an older version, shut it down. Wait until it has completely
shut down (which might take a few minutes for older versions), then run the
installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or
bitcoind/bitcoin-qt (on Linux).
Downgrading warning
Because release 0.10.0 makes use of headers-first synchronization and parallel
block download (see further), the block files and databases are not
backwards-compatible with older versions of Bitcoin Core or other software:
  • Blocks will be stored on disk out of order (in the order they are
received, really), which makes it incompatible with some tools or
other programs. Reindexing using earlier versions will also not work
anymore as a result of this.
  • The block index database will now hold headers for which no block is
stored on disk, which earlier versions won't support.
If you want to be able to downgrade smoothly, make a backup of your entire data
directory. Without this your node will need start syncing (or importing from
bootstrap.dat) anew afterwards. It is possible that the data from a completely
synchronised 0.10 node may be usable in older versions as-is, but this is not
supported and may break as soon as the older version attempts to reindex.
This does not affect wallet forward or backward compatibility.
Notable changes

Faster synchronization
Bitcoin Core now uses 'headers-first synchronization'. This means that we first
ask peers for block headers (a total of 27 megabytes, as of December 2014) and
validate those. In a second stage, when the headers have been discovered, we
download the blocks. However, as we already know about the whole chain in
advance, the blocks can be downloaded in parallel from all available peers.
In practice, this means a much faster and more robust synchronization. On
recent hardware with a decent network link, it can be as little as 3 hours
for an initial full synchronization. You may notice a slower progress in the
very first few minutes, when headers are still being fetched and verified, but
it should gain speed afterwards.
A few RPCs were added/updated as a result of this:
  • getblockchaininfo now returns the number of validated headers in addition to
the number of validated blocks.
  • getpeerinfo lists both the number of blocks and headers we know we have in
common with each peer. While synchronizing, the heights of the blocks that we
have requested from peers (but haven't received yet) are also listed as
'inflight'.
  • A new RPC getchaintips lists all known branches of the block chain,
including those we only have headers for.
Transaction fee changes
This release automatically estimates how high a transaction fee (or how
high a priority) transactions require to be confirmed quickly. The default
settings will create transactions that confirm quickly; see the new
'txconfirmtarget' setting to control the tradeoff between fees and
confirmation times. Fees are added by default unless the 'sendfreetransactions'
setting is enabled.
Prior releases used hard-coded fees (and priorities), and would
sometimes create transactions that took a very long time to confirm.
Statistics used to estimate fees and priorities are saved in the
data directory in the fee_estimates.dat file just before
program shutdown, and are read in at startup.
New command line options for transaction fee changes:
  • -txconfirmtarget=n : create transactions that have enough fees (or priority)
so they are likely to begin confirmation within n blocks (default: 1). This setting
is over-ridden by the -paytxfee option.
  • -sendfreetransactions : Send transactions as zero-fee transactions if possible
(default: 0)
New RPC commands for fee estimation:
  • estimatefee nblocks : Returns approximate fee-per-1,000-bytes needed for
a transaction to begin confirmation within nblocks. Returns -1 if not enough
transactions have been observed to compute a good estimate.
  • estimatepriority nblocks : Returns approximate priority needed for
a zero-fee transaction to begin confirmation within nblocks. Returns -1 if not
enough free transactions have been observed to compute a good
estimate.
RPC access control changes
Subnet matching for the purpose of access control is now done
by matching the binary network address, instead of with string wildcard matching.
For the user this means that -rpcallowip takes a subnet specification, which can be
  • a single IP address (e.g. 1.2.3.4 or fe80::0012:3456:789a:bcde)
  • a network/CIDR (e.g. 1.2.3.0/24 or fe80::0000/64)
  • a network/netmask (e.g. 1.2.3.4/255.255.255.0 or fe80::0012:3456:789a:bcde/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff)
An arbitrary number of -rpcallow arguments can be given. An incoming connection will be accepted if its origin address
matches one of them.
For example:
| 0.9.x and before | 0.10.x |
|--------------------------------------------|---------------------------------------|
| -rpcallowip=192.168.1.1 | -rpcallowip=192.168.1.1 (unchanged) |
| -rpcallowip=192.168.1.* | -rpcallowip=192.168.1.0/24 |
| -rpcallowip=192.168.* | -rpcallowip=192.168.0.0/16 |
| -rpcallowip=* (dangerous!) | -rpcallowip=::/0 (still dangerous!) |
Using wildcards will result in the rule being rejected with the following error in debug.log:
 Error: Invalid -rpcallowip subnet specification: *. Valid are a single IP (e.g. 1.2.3.4), a network/netmask (e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24). 
REST interface
A new HTTP API is exposed when running with the -rest flag, which allows
unauthenticated access to public node data.
It is served on the same port as RPC, but does not need a password, and uses
plain HTTP instead of JSON-RPC.
Assuming a local RPC server running on port 8332, it is possible to request:
In every case, EXT can be bin (for raw binary data), hex (for hex-encoded
binary) or json.
For more details, see the doc/REST-interface.md document in the repository.
RPC Server "Warm-Up" Mode
The RPC server is started earlier now, before most of the expensive
intialisations like loading the block index. It is available now almost
immediately after starting the process. However, until all initialisations
are done, it always returns an immediate error with code -28 to all calls.
This new behaviour can be useful for clients to know that a server is already
started and will be available soon (for instance, so that they do not
have to start it themselves).
Improved signing security
For 0.10 the security of signing against unusual attacks has been
improved by making the signatures constant time and deterministic.
This change is a result of switching signing to use libsecp256k1
instead of OpenSSL. Libsecp256k1 is a cryptographic library
optimized for the curve Bitcoin uses which was created by Bitcoin
Core developer Pieter Wuille.
There exist attacks[1] against most ECC implementations where an
attacker on shared virtual machine hardware could extract a private
key if they could cause a target to sign using the same key hundreds
of times. While using shared hosts and reusing keys are inadvisable
for other reasons, it's a better practice to avoid the exposure.
OpenSSL has code in their source repository for derandomization
and reduction in timing leaks that we've eagerly wanted to use for a
long time, but this functionality has still not made its
way into a released version of OpenSSL. Libsecp256k1 achieves
significantly stronger protection: As far as we're aware this is
the only deployed implementation of constant time signing for
the curve Bitcoin uses and we have reason to believe that
libsecp256k1 is better tested and more thoroughly reviewed
than the implementation in OpenSSL.
[1] https://eprint.iacr.org/2014/161.pdf
Watch-only wallet support
The wallet can now track transactions to and from wallets for which you know
all addresses (or scripts), even without the private keys.
This can be used to track payments without needing the private keys online on a
possibly vulnerable system. In addition, it can help for (manual) construction
of multisig transactions where you are only one of the signers.
One new RPC, importaddress, is added which functions similarly to
importprivkey, but instead takes an address or script (in hexadecimal) as
argument. After using it, outputs credited to this address or script are
considered to be received, and transactions consuming these outputs will be
considered to be sent.
The following RPCs have optional support for watch-only:
getbalance, listreceivedbyaddress, listreceivedbyaccount,
listtransactions, listaccounts, listsinceblock, gettransaction. See the
RPC documentation for those methods for more information.
Compared to using getrawtransaction, this mechanism does not require
-txindex, scales better, integrates better with the wallet, and is compatible
with future block chain pruning functionality. It does mean that all relevant
addresses need to added to the wallet before the payment, though.
Consensus library
Starting from 0.10.0, the Bitcoin Core distribution includes a consensus library.
The purpose of this library is to make the verification functionality that is
critical to Bitcoin's consensus available to other applications, e.g. to language
bindings such as [python-bitcoinlib](https://pypi.python.org/pypi/python-bitcoinlib) or
alternative node implementations.
This library is called libbitcoinconsensus.so (or, .dll for Windows).
Its interface is defined in the C header [bitcoinconsensus.h](https://github.com/bitcoin/bitcoin/blob/0.10/src/script/bitcoinconsensus.h).
In its initial version the API includes two functions:
  • bitcoinconsensus_verify_script verifies a script. It returns whether the indicated input of the provided serialized transaction
correctly spends the passed scriptPubKey under additional constraints indicated by flags
  • bitcoinconsensus_version returns the API version, currently at an experimental 0
The functionality is planned to be extended to e.g. UTXO management in upcoming releases, but the interface
for existing methods should remain stable.
Standard script rules relaxed for P2SH addresses
The IsStandard() rules have been almost completely removed for P2SH
redemption scripts, allowing applications to make use of any valid
script type, such as "n-of-m OR y", hash-locked oracle addresses, etc.
While the Bitcoin protocol has always supported these types of script,
actually using them on mainnet has been previously inconvenient as
standard Bitcoin Core nodes wouldn't relay them to miners, nor would
most miners include them in blocks they mined.
bitcoin-tx
It has been observed that many of the RPC functions offered by bitcoind are
"pure functions", and operate independently of the bitcoind wallet. This
included many of the RPC "raw transaction" API functions, such as
createrawtransaction.
bitcoin-tx is a newly introduced command line utility designed to enable easy
manipulation of bitcoin transactions. A summary of its operation may be
obtained via "bitcoin-tx --help" Transactions may be created or signed in a
manner similar to the RPC raw tx API. Transactions may be updated, deleting
inputs or outputs, or appending new inputs and outputs. Custom scripts may be
easily composed using a simple text notation, borrowed from the bitcoin test
suite.
This tool may be used for experimenting with new transaction types, signing
multi-party transactions, and many other uses. Long term, the goal is to
deprecate and remove "pure function" RPC API calls, as those do not require a
server round-trip to execute.
Other utilities "bitcoin-key" and "bitcoin-script" have been proposed, making
key and script operations easily accessible via command line.
Mining and relay policy enhancements
Bitcoin Core's block templates are now for version 3 blocks only, and any mining
software relying on its getblocktemplate must be updated in parallel to use
libblkmaker either version 0.4.2 or any version from 0.5.1 onward.
If you are solo mining, this will affect you the moment you upgrade Bitcoin
Core, which must be done prior to BIP66 achieving its 951/1001 status.
If you are mining with the stratum mining protocol: this does not affect you.
If you are mining with the getblocktemplate protocol to a pool: this will affect
you at the pool operator's discretion, which must be no later than BIP66
achieving its 951/1001 status.
The prioritisetransaction RPC method has been added to enable miners to
manipulate the priority of transactions on an individual basis.
Bitcoin Core now supports BIP 22 long polling, so mining software can be
notified immediately of new templates rather than having to poll periodically.
Support for BIP 23 block proposals is now available in Bitcoin Core's
getblocktemplate method. This enables miners to check the basic validity of
their next block before expending work on it, reducing risks of accidental
hardforks or mining invalid blocks.
Two new options to control mining policy:
  • -datacarrier=0/1 : Relay and mine "data carrier" (OP_RETURN) transactions
if this is 1.
  • -datacarriersize=n : Maximum size, in bytes, we consider acceptable for
"data carrier" outputs.
The relay policy has changed to more properly implement the desired behavior of not
relaying free (or very low fee) transactions unless they have a priority above the
AllowFreeThreshold(), in which case they are relayed subject to the rate limiter.
BIP 66: strict DER encoding for signatures
Bitcoin Core 0.10 implements BIP 66, which introduces block version 3, and a new
consensus rule, which prohibits non-DER signatures. Such transactions have been
non-standard since Bitcoin v0.8.0 (released in February 2013), but were
technically still permitted inside blocks.
This change breaks the dependency on OpenSSL's signature parsing, and is
required if implementations would want to remove all of OpenSSL from the
consensus code.
The same miner-voting mechanism as in BIP 34 is used: when 751 out of a
sequence of 1001 blocks have version number 3 or higher, the new consensus
rule becomes active for those blocks. When 951 out of a sequence of 1001
blocks have version number 3 or higher, it becomes mandatory for all blocks.
Backward compatibility with current mining software is NOT provided, thus miners
should read the first paragraph of "Mining and relay policy enhancements" above.
0.10.0 Change log

Detailed release notes follow. This overview includes changes that affect external
behavior, not code moves, refactors or string updates.
RPC:
  • f923c07 Support IPv6 lookup in bitcoin-cli even when IPv6 only bound on localhost
  • b641c9c Fix addnode "onetry": Connect with OpenNetworkConnection
  • 171ca77 estimatefee / estimatepriority RPC methods
  • b750cf1 Remove cli functionality from bitcoind
  • f6984e8 Add "chain" to getmininginfo, improve help in getblockchaininfo
  • 99ddc6c Add nLocalServices info to RPC getinfo
  • cf0c47b Remove getwork() RPC call
  • 2a72d45 prioritisetransaction
  • e44fea5 Add an option -datacarrier to allow users to disable relaying/mining data carrier transactions
  • 2ec5a3d Prevent easy RPC memory exhaustion attack
  • d4640d7 Added argument to getbalance to include watchonly addresses and fixed errors in balance calculation
  • 83f3543 Added argument to listaccounts to include watchonly addresses
  • 952877e Showing 'involvesWatchonly' property for transactions returned by 'listtransactions' and 'listsinceblock'. It is only appended when the transaction involves a watchonly address
  • d7d5d23 Added argument to listtransactions and listsinceblock to include watchonly addresses
  • f87ba3d added includeWatchonly argument to 'gettransaction' because it affects balance calculation
  • 0fa2f88 added includedWatchonly argument to listreceivedbyaddress/...account
  • 6c37f7f getrawchangeaddress: fail when keypool exhausted and wallet locked
  • ff6a7af getblocktemplate: longpolling support
  • c4a321f Add peerid to getpeerinfo to allow correlation with the logs
  • 1b4568c Add vout to ListTransactions output
  • b33bd7a Implement "getchaintips" RPC command to monitor blockchain forks
  • 733177e Remove size limit in RPC client, keep it in server
  • 6b5b7cb Categorize rpc help overview
  • 6f2c26a Closely track mempool byte total. Add "getmempoolinfo" RPC
  • aa82795 Add detailed network info to getnetworkinfo RPC
  • 01094bd Don't reveal whether password is <20 or >20 characters in RPC
  • 57153d4 rpc: Compute number of confirmations of a block from block height
  • ff36cbe getnetworkinfo: export local node's client sub-version string
  • d14d7de SanitizeString: allow '(' and ')'
  • 31d6390 Fixed setaccount accepting foreign address
  • b5ec5fe update getnetworkinfo help with subversion
  • ad6e601 RPC additions after headers-first
  • 33dfbf5 rpc: Fix leveldb iterator leak, and flush before gettxoutsetinfo
  • 2aa6329 Enable customising node policy for datacarrier data size with a -datacarriersize option
  • f877aaa submitblock: Use a temporary CValidationState to determine accurately the outcome of ProcessBlock
  • e69a587 submitblock: Support for returning specific rejection reasons
  • af82884 Add "warmup mode" for RPC server
  • e2655e0 Add unauthenticated HTTP REST interface to public blockchain data
  • 683dc40 Disable SSLv3 (in favor of TLS) for the RPC client and server
  • 44b4c0d signrawtransaction: validate private key
  • 9765a50 Implement BIP 23 Block Proposal
  • f9de17e Add warning comment to getinfo
Command-line options:
  • ee21912 Use netmasks instead of wildcards for IP address matching
  • deb3572 Add -rpcbind option to allow binding RPC port on a specific interface
  • 96b733e Add -version option to get just the version
  • 1569353 Add -stopafterblockimport option
  • 77cbd46 Let -zapwallettxes recover transaction meta data
  • 1c750db remove -tor compatibility code (only allow -onion)
  • 4aaa017 rework help messages for fee-related options
  • 4278b1d Clarify error message when invalid -rpcallowip
  • 6b407e4 -datadir is now allowed in config files
  • bdd5b58 Add option -sysperms to disable 077 umask (create new files with system default umask)
  • cbe39a3 Add "bitcoin-tx" command line utility and supporting modules
  • dbca89b Trigger -alertnotify if network is upgrading without you
  • ad96e7c Make -reindex cope with out-of-order blocks
  • 16d5194 Skip reindexed blocks individually
  • ec01243 --tracerpc option for regression tests
  • f654f00 Change -genproclimit default to 1
  • 3c77714 Make -proxy set all network types, avoiding a connect leak
  • 57be955 Remove -printblock, -printblocktree, and -printblockindex
  • ad3d208 remove -maxorphanblocks config parameter since it is no longer functional
Block and transaction handling:
  • 7a0e84d ProcessGetData(): abort if a block file is missing from disk
  • 8c93bf4 LoadBlockIndexDB(): Require block db reindex if any blk*.dat files are missing
  • 77339e5 Get rid of the static chainMostWork (optimization)
  • 4e0eed8 Allow ActivateBestChain to release its lock on cs_main
  • 18e7216 Push cs_mains down in ProcessBlock
  • fa126ef Avoid undefined behavior using CFlatData in CScript serialization
  • 7f3b4e9 Relax IsStandard rules for pay-to-script-hash transactions
  • c9a0918 Add a skiplist to the CBlockIndex structure
  • bc42503 Use unordered_map for CCoinsViewCache with salted hash (optimization)
  • d4d3fbd Do not flush the cache after every block outside of IBD (optimization)
  • ad08d0b Bugfix: make CCoinsViewMemPool support pruned entries in underlying cache
  • 5734d4d Only remove actualy failed blocks from setBlockIndexValid
  • d70bc52 Rework block processing benchmark code
  • 714a3e6 Only keep setBlockIndexValid entries that are possible improvements
  • ea100c7 Reduce maximum coinscache size during verification (reduce memory usage)
  • 4fad8e6 Reject transactions with excessive numbers of sigops
  • b0875eb Allow BatchWrite to destroy its input, reducing copying (optimization)
  • 92bb6f2 Bypass reloading blocks from disk (optimization)
  • 2e28031 Perform CVerifyDB on pcoinsdbview instead of pcoinsTip (reduce memory usage)
  • ab15b2e Avoid copying undo data (optimization)
  • 341735e Headers-first synchronization
  • afc32c5 Fix rebuild-chainstate feature and improve its performance
  • e11b2ce Fix large reorgs
  • ed6d1a2 Keep information about all block files in memory
  • a48f2d6 Abstract context-dependent block checking from acceptance
  • 7e615f5 Fixed mempool sync after sending a transaction
  • 51ce901 Improve chainstate/blockindex disk writing policy
  • a206950 Introduce separate flushing modes
  • 9ec75c5 Add a locking mechanism to IsInitialBlockDownload to ensure it never goes from false to true
  • 868d041 Remove coinbase-dependant transactions during reorg
  • 723d12c Remove txn which are invalidated by coinbase maturity during reorg
  • 0cb8763 Check against MANDATORY flags prior to accepting to mempool
  • 8446262 Reject headers that build on an invalid parent
  • 008138c Bugfix: only track UTXO modification after lookup
P2P protocol and network code:
  • f80cffa Do not trigger a DoS ban if SCRIPT_VERIFY_NULLDUMMY fails
  • c30329a Add testnet DNS seed of Alex Kotenko
  • 45a4baf Add testnet DNS seed of Andreas Schildbach
  • f1920e8 Ping automatically every 2 minutes (unconditionally)
  • 806fd19 Allocate receive buffers in on the fly
  • 6ecf3ed Display unknown commands received
  • aa81564 Track peers' available blocks
  • caf6150 Use async name resolving to improve net thread responsiveness
  • 9f4da19 Use pong receive time rather than processing time
  • 0127a9b remove SOCKS4 support from core and GUI, use SOCKS5
  • 40f5cb8 Send rejects and apply DoS scoring for errors in direct block validation
  • dc942e6 Introduce whitelisted peers
  • c994d2e prevent SOCKET leak in BindListenPort()
  • a60120e Add built-in seeds for .onion
  • 60dc8e4 Allow -onlynet=onion to be used
  • 3a56de7 addrman: Do not propagate obviously poor addresses onto the network
  • 6050ab6 netbase: Make SOCKS5 negotiation interruptible
  • 604ee2a Remove tx from AlreadyAskedFor list once we receive it, not when we process it
  • efad808 Avoid reject message feedback loops
  • 71697f9 Separate protocol versioning from clientversion
  • 20a5f61 Don't relay alerts to peers before version negotiation
  • b4ee0bd Introduce preferred download peers
  • 845c86d Do not use third party services for IP detection
  • 12a49ca Limit the number of new addressses to accumulate
  • 35e408f Regard connection failures as attempt for addrman
  • a3a7317 Introduce 10 minute block download timeout
  • 3022e7d Require sufficent priority for relay of free transactions
  • 58fda4d Update seed IPs, based on bitcoin.sipa.be crawler data
  • 18021d0 Remove bitnodes.io from dnsseeds.
Validation:
  • 6fd7ef2 Also switch the (unused) verification code to low-s instead of even-s
  • 584a358 Do merkle root and txid duplicates check simultaneously
  • 217a5c9 When transaction outputs exceed inputs, show the offending amounts so as to aid debugging
  • f74fc9b Print input index when signature validation fails, to aid debugging
  • 6fd59ee script.h: set_vch() should shift a >32 bit value
  • d752ba8 Add SCRIPT_VERIFY_SIGPUSHONLY (BIP62 rule 2) (test only)
  • 698c6ab Add SCRIPT_VERIFY_MINIMALDATA (BIP62 rules 3 and 4) (test only)
  • ab9edbd script: create sane error return codes for script validation and remove logging
  • 219a147 script: check ScriptError values in script tests
  • 0391423 Discourage NOPs reserved for soft-fork upgrades
  • 98b135f Make STRICTENC invalid pubkeys fail the script rather than the opcode
  • 307f7d4 Report script evaluation failures in log and reject messages
  • ace39db consensus: guard against openssl's new strict DER checks
  • 12b7c44 Improve robustness of DER recoding code
  • 76ce5c8 fail immediately on an empty signature
Build system:
  • f25e3ad Fix build in OS X 10.9
  • 65e8ba4 build: Switch to non-recursive make
  • 460b32d build: fix broken boost chrono check on some platforms
  • 9ce0774 build: Fix windows configure when using --with-qt-libdir
  • ea96475 build: Add mention of --disable-wallet to bdb48 error messages
  • 1dec09b depends: add shared dependency builder
  • c101c76 build: Add --with-utils (bitcoin-cli and bitcoin-tx, default=yes). Help string consistency tweaks. Target sanity check fix
  • e432a5f build: add option for reducing exports (v2)
  • 6134b43 Fixing condition 'sabotaging' MSVC build
  • af0bd5e osx: fix signing to make Gatekeeper happy (again)
  • a7d1f03 build: fix dynamic boost check when --with-boost= is used
  • d5fd094 build: fix qt test build when libprotobuf is in a non-standard path
  • 2cf5f16 Add libbitcoinconsensus library
  • 914868a build: add a deterministic dmg signer
  • 2d375fe depends: bump openssl to 1.0.1k
  • b7a4ecc Build: Only check for boost when building code that requires it
Wallet:
  • b33d1f5 Use fee/priority estimates in wallet CreateTransaction
  • 4b7b1bb Sanity checks for estimates
  • c898846 Add support for watch-only addresses
  • d5087d1 Use script matching rather than destination matching for watch-only
  • d88af56 Fee fixes
  • a35b55b Dont run full check every time we decrypt wallet
  • 3a7c348 Fix make_change to not create half-satoshis
  • f606bb9 fix a possible memory leak in CWalletDB::Recover
  • 870da77 fix possible memory leaks in CWallet::EncryptWallet
  • ccca27a Watch-only fixes
  • 9b1627d [Wallet] Reduce minTxFee for transaction creation to 1000 satoshis
  • a53fd41 Deterministic signing
  • 15ad0b5 Apply AreSane() checks to the fees from the network
  • 11855c1 Enforce minRelayTxFee on wallet created tx and add a maxtxfee option
GUI:
  • c21c74b osx: Fix missing dock menu with qt5
  • b90711c Fix Transaction details shows wrong To:
  • 516053c Make links in 'About Bitcoin Core' clickable
  • bdc83e8 Ensure payment request network matches client network
  • 65f78a1 Add GUI view of peer information
  • 06a91d9 VerifyDB progress reporting
  • fe6bff2 Add BerkeleyDB version info to RPCConsole
  • b917555 PeerTableModel: Fix potential deadlock. #4296
  • dff0e3b Improve rpc console history behavior
  • 95a9383 Remove CENT-fee-rule from coin control completely
  • 56b07d2 Allow setting listen via GUI
  • d95ba75 Log messages with type>QtDebugMsg as non-debug
  • 8969828 New status bar Unit Display Control and related changes
  • 674c070 seed OpenSSL PNRG with Windows event data
  • 509f926 Payment request parsing on startup now only changes network if a valid network name is specified
  • acd432b Prevent balloon-spam after rescan
  • 7007402 Implement SI-style (thin space) thoudands separator
  • 91cce17 Use fixed-point arithmetic in amount spinbox
  • bdba2dd Remove an obscure option no-one cares about
  • bd0aa10 Replace the temporary file hack currently used to change Bitcoin-Qt's dock icon (OS X) with a buffer-based solution
  • 94e1b9e Re-work overviewpage UI
  • 8bfdc9a Better looking trayicon
  • b197bf3 disable tray interactions when client model set to 0
  • 1c5f0af Add column Watch-only to transactions list
  • 21f139b Fix tablet crash. closes #4854
  • e84843c Broken addresses on command line no longer trigger testnet
  • a49f11d Change splash screen to normal window
  • 1f9be98 Disable App Nap on OSX 10.9+
  • 27c3e91 Add proxy to options overridden if necessary
  • 4bd1185 Allow "emergency" shutdown during startup
  • d52f072 Don't show wallet options in the preferences menu when running with -disablewallet
  • 6093aa1 Qt: QProgressBar CPU-Issue workaround
  • 0ed9675 [Wallet] Add global boolean whether to send free transactions (default=true)
  • ed3e5e4 [Wallet] Add global boolean whether to pay at least the custom fee (default=true)
  • e7876b2 [Wallet] Prevent user from paying a non-sense fee
  • c1c9d5b Add Smartfee to GUI
  • e0a25c5 Make askpassphrase dialog behave more sanely
  • 94b362d On close of splashscreen interrupt verifyDB
  • b790d13 English translation update
  • 8543b0d Correct tooltip on address book page
Tests:
  • b41e594 Fix script test handling of empty scripts
  • d3a33fc Test CHECKMULTISIG with m == 0 and n == 0
  • 29c1749 Let tx (in)valid tests use any SCRIPT_VERIFY flag
  • 6380180 Add rejection of non-null CHECKMULTISIG dummy values
  • 21bf3d2 Add tests for BoostAsioToCNetAddr
  • b5ad5e7 Add Python test for -rpcbind and -rpcallowip
  • 9ec0306 Add CODESEPARATOFindAndDelete() tests
  • 75ebced Added many rpc wallet tests
  • 0193fb8 Allow multiple regression tests to run at once
  • 92a6220 Hook up sanity checks
  • 3820e01 Extend and move all crypto tests to crypto_tests.cpp
  • 3f9a019 added list/get received by address/ account tests
  • a90689f Remove timing-based signature cache unit test
  • 236982c Add skiplist unit tests
  • f4b00be Add CChain::GetLocator() unit test
  • b45a6e8 Add test for getblocktemplate longpolling
  • cdf305e Set -discover=0 in regtest framework
  • ed02282 additional test for OP_SIZE in script_valid.json
  • 0072d98 script tests: BOOLAND, BOOLOR decode to integer
  • 833ff16 script tests: values that overflow to 0 are true
  • 4cac5db script tests: value with trailing 0x00 is true
  • 89101c6 script test: test case for 5-byte bools
  • d2d9dc0 script tests: add tests for CHECKMULTISIG limits
  • d789386 Add "it works" test for bitcoin-tx
  • df4d61e Add bitcoin-tx tests
  • aa41ac2 Test IsPushOnly() with invalid push
  • 6022b5d Make script_{valid,invalid}.json validation flags configurable
  • 8138cbe Add automatic script test generation, and actual checksig tests
  • ed27e53 Add coins_tests with a large randomized CCoinViewCache test
  • 9df9cf5 Make SCRIPT_VERIFY_STRICTENC compatible with BIP62
  • dcb9846 Extend getchaintips RPC test
  • 554147a Ensure MINIMALDATA invalid tests can only fail one way
  • dfeec18 Test every numeric-accepting opcode for correct handling of the numeric minimal encoding rule
  • 2b62e17 Clearly separate PUSHDATA and numeric argument MINIMALDATA tests
  • 16d78bd Add valid invert of invalid every numeric opcode tests
  • f635269 tests: enable alertnotify test for Windows
  • 7a41614 tests: allow rpc-tests to get filenames for bitcoind and bitcoin-cli from the environment
  • 5122ea7 tests: fix forknotify.py on windows
  • fa7f8cd tests: remove old pull-tester scripts
  • 7667850 tests: replace the old (unused since Travis) tests with new rpc test scripts
  • f4e0aef Do signature-s negation inside the tests
  • 1837987 Optimize -regtest setgenerate block generation
  • 2db4c8a Fix node ranges in the test framework
  • a8b2ce5 regression test only setmocktime RPC call
  • daf03e7 RPC tests: create initial chain with specific timestamps
  • 8656dbb Port/fix txnmall.sh regression test
  • ca81587 Test the exact order of CHECKMULTISIG sig/pubkey evaluation
  • 7357893 Prioritize and display -testsafemode status in UI
  • f321d6b Add key generation/verification to ECC sanity check
  • 132ea9b miner_tests: Disable checkpoints so they don't fail the subsidy-change test
  • bc6cb41 QA RPC tests: Add tests block block proposals
  • f67a9ce Use deterministically generated script tests
  • 11d7a7d [RPC] add rpc-test for http keep-alive (persistent connections)
  • 34318d7 RPC-test based on invalidateblock for mempool coinbase spends
  • 76ec867 Use actually valid transactions for script tests
  • c8589bf Add actual signature tests
  • e2677d7 Fix smartfees test for change to relay policy
  • 263b65e tests: run sanity checks in tests too
Miscellaneous:
  • 122549f Fix incorrect checkpoint data for testnet3
  • 5bd02cf Log used config file to debug.log on startup
  • 68ba85f Updated Debian example bitcoin.conf with config from wiki + removed some cruft and updated comments
  • e5ee8f0 Remove -beta suffix
  • 38405ac Add comment regarding experimental-use service bits
  • be873f6 Issue warning if collecting RandSeed data failed
  • 8ae973c Allocate more space if necessary in RandSeedAddPerfMon
  • 675bcd5 Correct comment for 15-of-15 p2sh script size
  • fda3fed libsecp256k1 integration
  • 2e36866 Show nodeid instead of addresses in log (for anonymity) unless otherwise requested
  • cd01a5e Enable paranoid corruption checks in LevelDB >= 1.16
  • 9365937 Add comment about never updating nTimeOffset past 199 samples
  • 403c1bf contrib: remove getwork-based pyminer (as getwork API call has been removed)
  • 0c3e101 contrib: Added systemd .service file in order to help distributions integrate bitcoind
  • 0a0878d doc: Add new DNSseed policy
  • 2887bff Update coding style and add .clang-format
  • 5cbda4f Changed LevelDB cursors to use scoped pointers to ensure destruction when going out of scope
  • b4a72a7 contrib/linearize: split output files based on new-timestamp-year or max-file-size
  • e982b57 Use explicit fflush() instead of setvbuf()
  • 234bfbf contrib: Add init scripts and docs for Upstart and OpenRC
  • 01c2807 Add warning about the merkle-tree algorithm duplicate txid flaw
  • d6712db Also create pid file in non-daemon mode
  • 772ab0e contrib: use batched JSON-RPC in linarize-hashes (optimization)
  • 7ab4358 Update bash-completion for v0.10
  • 6e6a36c contrib: show pull # in prompt for github-merge script
  • 5b9f842 Upgrade leveldb to 1.18, make chainstate databases compatible between ARM and x86 (issue #2293)
  • 4e7c219 Catch UTXO set read errors and shutdown
  • 867c600 Catch LevelDB errors during flush
  • 06ca065 Fix CScriptID(const CScript& in) in empty script case
Credits

Thanks to everyone who contributed to this release:
  • 21E14
  • Adam Weiss
  • Aitor Pazos
  • Alexander Jeng
  • Alex Morcos
  • Alon Muroch
  • Andreas Schildbach
  • Andrew Poelstra
  • Andy Alness
  • Ashley Holman
  • Benedict Chan
  • Ben Holden-Crowther
  • Bryan Bishop
  • BtcDrak
  • Christian von Roques
  • Clinton Christian
  • Cory Fields
  • Cozz Lovan
  • daniel
  • Daniel Kraft
  • David Hill
  • Derek701
  • dexX7
  • dllud
  • Dominyk Tiller
  • Doug
  • elichai
  • elkingtowa
  • ENikS
  • Eric Shaw
  • Federico Bond
  • Francis GASCHET
  • Gavin Andresen
  • Giuseppe Mazzotta
  • Glenn Willen
  • Gregory Maxwell
  • gubatron
  • HarryWu
  • himynameismartin
  • Huang Le
  • Ian Carroll
  • imharrywu
  • Jameson Lopp
  • Janusz Lenar
  • JaSK
  • Jeff Garzik
  • JL2035
  • Johnathan Corgan
  • Jonas Schnelli
  • jtimon
  • Julian Haight
  • Kamil Domanski
  • kazcw
  • kevin
  • kiwigb
  • Kosta Zertsekel
  • LongShao007
  • Luke Dashjr
  • Mark Friedenbach
  • Mathy Vanvoorden
  • Matt Corallo
  • Matthew Bogosian
  • Micha
  • Michael Ford
  • Mike Hearn
  • mrbandrews
  • mruddy
  • ntrgn
  • Otto Allmendinger
  • paveljanik
  • Pavel Vasin
  • Peter Todd
  • phantomcircuit
  • Philip Kaufmann
  • Pieter Wuille
  • pryds
  • randy-waterhouse
  • R E Broadley
  • Rose Toomey
  • Ross Nicoll
  • Roy Badami
  • Ruben Dario Ponticelli
  • Rune K. Svendsen
  • Ryan X. Charles
  • Saivann
  • sandakersmann
  • SergioDemianLerner
  • shshshsh
  • sinetek
  • Stuart Cardall
  • Suhas Daftuar
  • Tawanda Kembo
  • Teran McKinney
  • tm314159
  • Tom Harding
  • Trevin Hofmann
  • Whit J
  • Wladimir J. van der Laan
  • Yoichi Hirai
  • Zak Wilcox
As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).
Also lots of thanks to the bitcoin.org website team David A. Harding and Saivann Carignan.
Wladimir
original: http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-February/007480.html
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Our API makes it easy to integrate bitcoin, bitcoin cash, litecoin and ethereum into both new and existing applications. Coinbase’s APIs enable a variety of capabilities; from simply gathering read-only data, to building something that’s never been done before. Capabilities: Generate bitcoin, bitcoin cash, litecoin and ethereum wallets and addresses; Buy/sell and send/receive bitcoin ... Did Coinbase discontinue their API Access or just Oauth2? Ask Question Asked 1 year, 4 ... , would be disabled as we can no longer provide support for these applications. We understand that this may be frustrating, especially with regards to the lack of communication over the disabling, but it was a decision that we had to make due to the change in levels of support that we can provide. At the ... PSA: Coinbase API Access Vunerability For the last few days from reading Coinbase user issues and the most recent post by /u/goodnews_everybody I highly recommend everyone to immediately go into your integrations page and make sure it is disabled (if you are using a key, kill it and disable it) and do not enable it until such time that Coinbase can verify any API leaks are fixed. Coinbase Commerce API, how to access the QR Code? I'm using the Coinbase Commerce API (PHP). I'm successfuly creating the Charge, but the response does not come with the QR Code (if i'm not wrong it's the "logo_url"). In their doc (https://... php laravel api coinbase-api. asked Sep 2 at 15:02. Morinohtar. 41 3 3 bronze badges. 0. votes. 1answer 79 views getting specific wallet balance from ... An API Key can be considered as a username. This is generated by the exchange once you declare your settings. An API Secret or API Private Key is simply another string of characters that must be used in combination with the API Key to establish the connection. An additional security layer can be added by generating an API Passphrase. While the ...

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Blockchain Hack Script 2020 GENERATES Unlimited 100% WORKING bitcoin hacked

The largest cryptocurrency exchange in the United States said its autoscaling was unable to keep up with a huge traffic spike that left many users unable to ... Hey friends! We will be using the GDAX API websocket to get real-time bitcoin market data. Stay tuned! Please excuse the poor audio. I had to amplify it because when I streamed live it was too low ... The tutorial will focus on three Cryptocurrencies, Ether, Bitcoin & Litecoin. First, we’ll look at how to create a wallet for each of these currencies using the Coinbase API, and then add code ... #bitcoin #blockchain #bitcoinearning #2020 #hacked #hack #blockchain #wallet #btc #how #to #free #crypto #generator #coinbase #script #bitsler #new #coin #binance #eth #hacking #withdraw #proof # ... In this video I talk about the basics of using Python requests by showing you how to call the Coinbase Bitcoin Price Index API. You can see the API docs here...

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