Most transactions to p2sh address has the follwing scriptpubkey

HASH160 f45d94733d430261962932e0c847075195916a04 OP_EQUAL

As I understood, this transaction do not need to be signed. Is it true?

User just provide redeemscript which HASH160 equal to f45d94733d430261962932e0c847075195916a04

So, we know that the

HASH160(data1) = hash1
HASH160(data2) = hash2

So, the question is: If user do two transaction to p2sh with the scriptpubkey like

HASH160 f45d94733d430261962932e0c847075195916a04 OP_EQUAL

than scriptpubkey is static in this transactions, but why the redeemscript is always different?

HASH160(data1) = hash1
HASH160(data2) = hash1
  • 2
    Can you provide an example of two different redeem scripts with the same hash? – Mike D Nov 15 at 20:25

A P2SH transaction will execute whatever redeemScript you provide, which must be a standard transaction:

Transactions that redeem these pay-to-script outpoints are only considered standard if the serialized script - also referred to as the redeemScript - is, itself, one of the other standard transaction types. See BIP16

Those standard transactions, like a P2PKH does require a signature, so even though you provide the right redeemScript, if it doesn't execute successfully, the entire tx will become invalid.

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