to BIP143 for the exact semantics Any witness stack items before the witnessScript are used as the input stack for script evaluation. 0x002032-byte scripthash) Same as P2SH-P2WSH, scripthash is SHA256 of the witnessScript. Non-witness and pre-segwit witness bytes weigh 4 WU, but each byte of Segwit witness data only weighs 1 WU, allowing blocks that are larger than 1 MB without a hardforking change. Native P2wpkh and P2WSH may be used as default change address, but this may allow other people to identify the change easily (see below) Until native P2wpkh and P2WSH are widely used, these address types may cause privacy concerns among users. It starts with a OP_0, followed by a canonical push of the scripthash (i.e.
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Each witness field starts with a compactSize integer to indicate the number of stack items for the corresponding txin. Such transactions, however, are invalid after activation of segwit and would not be accepted in a block. When spending a native P2WSH, the scriptSig must be empty, and the witness stack format and signature generating rules are same as P2SH-P2WSH (including the requirement of using compressed public key) Example Why and How to Use Native (Bech32) P2wpkh and P2WSH? 0x002032-byte scripthash) Same as any other P2SH, the scriptPubKey is OP_hash160 hash160(redeemScript) OP_equal, and the address is the corresponding P2SH address with prefix. This required some coordination amongst the economic majority, but was ultimately successful, activating Segwit on Bitcoin soon after 1st August 2017.