Im trying to understand how to obtain the p2SH address when decoding an output script.
As far as I understand CScriptID is the hash160 of the script.
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So, a P2SH scriptPubKey looks like this:
OP_HASH160 <20 byte script hash> OP_EQUAL
Serialized, in hex, that looks like:
17a9140000000000000000000000000000000000000087 ^ ScriptPubkey len ^ OP_HASH160 ^ Data element len ^ Data element ^ OP_EQUAL
where the zeros can be any byte.
How does that transform into an address starting with 3? You transform it the same way you would a normal Bitcoin address, but with a different version byte. Instead of
00, you would use
See also the P2SH address specification.