cryptography is a package which provides cryptographic recipes and primitives to Python developers.

How a Blockchain works?
It's an exciting project that help to understand what Blockchain really is.

Some issues that was developed:

• Generate, store and load private and public keys
• Private key optionaly encrypted while saving as file using a password
• Use SHA256 for wallet addresses
• Sign transaction using private key
• Check transaction signature using public key
• Get balance using input/output/open transactions
• Check balance before sending transaction
• Genesis Block
• Difficulty of mining (numbers of leading zeroes)
• Mining reward
• Previous block hash check
• Check Proof of Work using block nonce, transactions(excluding reward transaction), previous hash
• Adding peer nodes
• Broadcast transaction to other peer nodes
• Broadcast block to to other peer nodes
• Consensus - longest chain wins
• Check blockchain length on node start
• Prevent sending transaction if node Blockchain is short
• Prevent mining block if node Blockchain is short
• Don't accept any broadcast if node Blockchain is short
• Update to longest Blockchain from configured peer nodes