TODO:

• utxo changed to only include utxo offset instead of whole hash
• Transaction needs only one signature instead of signing each utxo input
• networking
• change pow algo from sha256 to something more asic resistant. (Maybe Nerva's algo?)
• can improve on security and memory O(n) -> O(1) by switching to Schnorr (so we can batch signatures in each tx since sum(sig) verifies on sum(keys))

Utxo based cryptocurrency using sha256 hashing algorithm and ecdsa signing on secp256k1 elliptic curve

• version -- 2 bytes
• value -- 4 bytes
• Owner -- 32 bytes

• utxo hash -- 32 bytes <-- this is created from Sha256([utxo, blockheader, index in utxos of block])
• sig size -- 1 byte
• signature^{sig size} -- 67-70 bytes

• version -- 2 bytes
• input countⁿ -- 1 byte
• serialized inputsⁿ -- 99-102 bytes
• output count^z -- 1 byte
• serialized outputs^z -- 42 bytes

• version -- 2 bytes
• prev block hash -- 32 bytes
• hash of all tx -- 32 bytes
• nonce -- 4 bytes
• serialized transactions^y