Build your own Proof Of Stake Blockchain

Implement a static signature validation method and a helper to export the public key to a string in the world class, then test detecting invalid transactions via signature verification.

Implement a payload method to ensure a consistent transaction representation with an empty signature, then build a wallet create_transaction method to sign and return transactions in one step.

Initialize a block class with transactions, last hash, and a forger fortune placeholder; build a human readable block via a to chasten method and test in main.

Explore the blockchain as an ever-growing list of blocks with hashes, the account model, and the proof-of-stake consensus powering peer-to-peer networks.

Build a blockchain by implementing a block chain class in Python, initialize an empty blocks list, add blocks without validation, and generate a human readable representation, then print the chain.

Introduce exchange transactions and update the account model by executing transactions in blocks, ensuring exchange occurs in the first block before the transfer in the next.

Implement a socket communication class as a node subclass to enable peer-to-peer connections using a circuit communication object, initialize with IP and port, and start and stop the port.

Explore peer discovery in a p2p network by building a discovery handler, initializing threads for discovery and status, and integrating with a socket communication class to broadcast and track peers.

Finish P2P demonstrates adapting the discovery handler, encoding and decoding handshake messages, and broadcasting discovery messages to build and test a blockchain peer-to-peer network.

Implement a node API class with Flask to expose a REST API for blockchain communication. Create a basic /info endpoint and test it in the browser at localhost.

Extend the socket and node messaging to handle transaction broadcasts, add received transactions to the node's pool, and propagate them over the peer-to-peer network using encoded transaction messages.

The lecture introduces the proof of stake algorithm as a consensus method for untrusted networks, explaining random, stake-proportional selection to determine the next block forger.

Explain how to preserve stability in a proof-of-stake block chain by enabling nodes to request the current block chain state when joining or reconnecting after outages.