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On a local elements testnet I've sent some coins to a p2sh address, now I'd like to build the scriptSig to spend them. Here is the code I'm trying to build:
let redeem_script = elements::script::Builder::new().push_key(&pubkey_a) .push_opcode(elements::opcodes::all::OP_CHECKSIG) .push_opcode(elements::opcodes::all::OP_IFDUP) .push_opcode(elements::opcodes::all::OP_NOTIF) .push_key(&pubkey_b) .push_opcode(elements::opcodes::all::OP_CHECKSIGVERIFY) .push_int(locktime_int) .push_opcode(elements::opcodes::all::OP_CSV) .push_opcode(elements::opcodes::all::OP_ENDIF) .into_script(); let redeem_script_bytes = redeem_script.as_bytes(); //sign the redeem script and create the script_sig let privka_key = bitcoin::PrivateKey::from_wif(&privkey_a).unwrap(); let redeem_message = bitcoin::secp256k1::Message::from_slice(redeem_script_bytes).unwrap(); let curve = bitcoin::secp256k1::SECP256K1; let signature = curve.sign(&redeem_message, &privka_key.key); let sig_bytes = signature.serialize_compact(); let script_sig = elements::script::Builder::new()//.push_opcode(elements::opcodes::all::OP_0) //.push_opcodes(elements::opcodes::all::OP_PUSHBYTES_64) .push_slice(&sig_bytes) .push_slice(redeem_script_bytes);
Questions are:
- First of all, does this make sense? I'm re-building the script used to obtain the address, then I use the private key linked to pubkey_a to sign the full script in bytes, finally try to build the scripSig that will be used in the Txin
- Is
sig_bytesthe correct way to get the bytes of the signed message and put them into the script?(serialise_compact()returns 64 bytes: 32 from r and 32 from s signature elements) - the script_sig, I think, should be
OP_0 <sig_a> <redeem_script>, is this correct (sig_a is the signed redeem script with privkey a)? There's apparently noOP_0in elements opcodes, also, ispush_sliceenough or should I explicitly say how many bytes I'm pushing?
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