I've added a new examples / cookbook section to the little
crypto-lite gem / library .
The first example is a look inside the magic bubble machine
and shows you how to generate / calculate the bitcoin (base58) address
form the (elliptic curve) public key in 1-2-3 steps. 
From the readme:
Let's try again with the shortcut helpers:
- `HASH160 - RMD160(SHA256(X))`
- `BASE58CHECK - BASE58(X || SHA256(SHA256(X))[:4])`
# Lets start with the public key ("raw" hex string encoded) pk = "0250863ad64a87ae8a2fe83c1af1a8403cb53f53e486d8511dad8a04887e5b2352" # 1. Perform HASH-160 hashing on the public key # a) Perform SHA-256 hashing on the public key # b) Perform RIPEMD-160 hashing on the result of SHA-256 step1 = hash160( pk ) #=> "f54a5851e9372b87810a8e60cdd2e7cfd80b6e31" # 2. Add version byte in front of RIPEMD-160 hash (0x00 for Main Network) step2 = "00" + step1 #=> "00f54a5851e9372b87810a8e60cdd2e7cfd80b6e31" # 3. Encode with BASE58CHECK # a) Perform SHA-256 hash on the extended RIPEMD-160 result # b) Perform SHA-256 hash on the result of the previous SHA-256 hash # c) Take the first 4 bytes of the second SHA-256 hash. This is the address checksum # d) Add the 4 checksum bytes at the end of # extended RIPEMD-160 hash from step 2. # This is the 25-byte binary Bitcoin Address. # e) Convert the result from a byte string into a base58 string # using Base58 encoding. # This is the most commonly used Bitcoin Address format. addr = base58check( step2 ) #=> "1PMycacnJaSqwwJqjawXBErnLsZ7RkXUAs"
Cheers. Prosit 2021!
PS: Bitcon Tip - How to Buy Bitcoin (The CO₂-Friendly Way)
1. Take one $50 bill, five $10 bills, or ten $5 bills (I wouldn't
recommend change - stay with paper money).
2. Go to the bathroom.
3. Lift the lid of the loo.
4. Throw money in.
5. Flush down water.
Congrats! You just purchased $50 worth of Bitcoin - without fucking
-- Trolly McTrollface, Bitcon Greater Fool Court Jester