An important piece of the process of transforming a Bitcoin private key into a public address, as outlined in the fantastic Mastering Bitcoin base64 encode bookis the Base58Check encoding algorithm.
The Bitcoin wiki has a great article on Base58Check encoding, and even gives an example implementation of the underlying Base58 encoding algorithm in C. For example, the characters O and 0or I and l can look similar or identical to some readers or users of certain fonts.
Instead, our Base58 encoding algorithm works by treating our binary as a single large number. We repeatedly divide that number by the size of our alphabet fifty eightand use the remainder of that division to map onto a character in our alphabet. This kind of algorithm can neatly be expressed in Elixir. We use that remainder to map into our alphabetand prepend the resulting bitcoin base64 encode onto our hash:. This implementation of our Base58 encoded mostly works.
We can encode any text bitcoin base64 encode and receive correct results:. Sign up for Pete's mailing list and have fresh bitcoin base64 encode delivered to you, hot off the presses every week! However when we try to encode binaries bitcoin base64 encode leading zero bytes, those bytes vanish from our resulting hash:.
That zero should become a leading " 1" in our resulting hash, but our process of converting the initial binary into a number is truncating those leading bytes. This index value is equivalent to the number of leading zero bytes in our binary. We simply grab the character in our alphabet that maps to a zero byte " 1"and duplicate it as many times as we need. Now we should be able to encode binaries with leading zero bytes and see their resulting " 1" values in our final hash:.
Now that we have a working implementation of the Base58 encoding algorithm, we can implement our Base58Check algorithm! Base58Check encoding is really just Base58 with an added checksum. At a high level, the process of Base58Check bitcoin base64 encode a blob of binary data involves hashing that data, taking the first four bytes of the resulting hash and appending them to the end of the binary, and Base58 encoding the result.
We can implement Base58Check fairly easily using our newly written Base58 module. Bitcoin uses the version byte to specify the type of address being encoded. We concatenate our versiondataand the result of bitcoin base64 encode checksum function together, and Base58 encode the result. We can go further and verify our implementation with an example pulled from the Bitcoin wiki:.
ElixirBitcoinMastering Bitcoin. Property Testing our Base58Check Encoder with an External Oracle — Property-based testing is an amazingly powerful tool to add to your testing toolbox. Check out how we can use it to verify the correctness of our Base58Check encoder against an external oracle. Generating Bitcoin Private Keys and Public Addresses with Elixir — Elixir ships with the tools required to generate a bitcoin base64 encode secure private key and transform it into a bitcoin base64 encode address.
Check out this step-by-step walkthrough. I had a lot of fun solving each of this year's challenges with Elixir. Secure Meteor — I'm announcing a new project: Learn to how to secure your Meteor application from a Meteor security professional.
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Written by Pete Corey on Jan 8,
Creation API, Analytics Platform Cryptocurrency market cap rankings, charts, transfer of coins is based on The Ethereum BlockChain Explorer more Name. I wish this wasn't JS, one of the coding languages i totally suck at. In exchange the researchers will pay those willing to lend their computing power to them with SPARC.