segwit

Transaction: txid -> hash(List[TxIn] || List[TxOut]) List[TxIn] List[TxOut]

TxIn: OutputPoint: Previous txid out_index (Signature, Script)

TxOut: Satoshis public address

Segwit Transaction: txid -> hash(List[TxIn] || List[TxOut]) List[SegTxIn] List[TxOut] Witness data (List[(Signature, Script)])

SegTxIn: OutputPoint: Previous txid out_index NULL

Why Segwit was introduced?

• Scalability

• Transaction malleability

Digital signature is handled by ECDSA secp256k1 because the equations looks like y^2 = x^3 + 7.

new nodes will caluclate weight of a transaction like this

3 * (txsize - witeness data size) + 1 * txsize

p2pk p2pkh p2sh is used to employ segwit initially and it is called native segwit