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Add get_anchor_script

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This is a script builder to generate anchor output ones. They can be
satisfied either by a signature for the committed funding pubkey or anyone
after CSV delay expiration.

This is used at anchor output addition while generating commitment transaction.
This commit is contained in:
Antoine Riard 2020-05-26 09:55:03 +02:00 • committed by Devrandom
parent 4368b56eb6
commit 97c29cfd34
1 changed files with 17 additions and 0 deletions
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17
lightning/src/ln/chan_utils.rs
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@ -564,6 +564,23 @@ pub fn build_htlc_transaction(commitment_txid: &Txid, feerate_per_kw: u32, conte
}
}
/// Gets the witnessScript for an anchor output from the funding public key.
/// The witness in the spending input must be:
/// <BIP 143 funding_signature>
/// After 16 blocks of confirmation, an alternative satisfying witness could be:
/// <>
#[inline]
pub(crate) fn get_anchor_redeemscript(funding_pubkey: &PublicKey) -> Script {
Builder::new().push_slice(&funding_pubkey.serialize()[..])
.push_opcode(opcodes::all::OP_CHECKSIG)
.push_opcode(opcodes::all::OP_IFDUP)
.push_opcode(opcodes::all::OP_NOTIF)
.push_int(16)
.push_opcode(opcodes::all::OP_CSV)
.push_opcode(opcodes::all::OP_ENDIF)
.into_script()
}
/// Per-channel data used to build transactions in conjunction with the per-commitment data (CommitmentTransaction).
/// The fields are organized by holder/counterparty.
///