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lnwallet: remove CLTV funding tx gen

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This commit is contained in:
Olaoluwa Osuntokun 2015-12-31 00:32:33 -06:00
parent 41f4992218
commit 5a7b98a9e4
1 changed files with 0 additions and 57 deletions
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57
lnwallet/channel.go
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@ -182,60 +182,3 @@ func lockTimeToSequence(isSeconds bool, locktime uint32) uint32 {
// 33,554,431 seconds, or 1.06 years. // 33,554,431 seconds, or 1.06 years.
return SequenceLockTimeSeconds | (locktime >> 9) return SequenceLockTimeSeconds | (locktime >> 9)
} }
//TODO(j): Creates a CLTV-only funding Tx (reserve is *REQUIRED*)
//This works for only CLTV soft-fork (no CSV/segwit soft-fork in yet)
//
//Commit funds to Funding Tx, will timeout after the fundingTimeLock and refund
//back using CLTV. As there is no way to enforce HTLCs, we rely upon a reserve
//and have each party's HTLCs in-transit be less than their Commitment reserve.
//In the event that someone incorrectly broadcasts an old Commitment TX, then
//the counterparty claims the full reserve. It may be possible for either party
//to claim the HTLC(!!! But it's okay because the "honest" party is made whole
//via the reserve). If it's two-funder there are two outputs and the
//Commitments spends from both outputs in the Funding Tx. Two-funder requires
//the ourKey/theirKey sig positions to be swapped (should be in 1 funding tx).
//
//Quick note before I forget: The revocation hash is used in CLTV-only for
//single-funder (without an initial payment) *as part of an additional output
//in the Commitment Tx for the reserve*. This is to establish a unidirectional
//channel UNITL the recipient has sufficient funds. When the recipient has
//sufficient funds, the revocation is exchanged and allows the recipient to
//claim the full reserve as penalty if the incorrect Commitment is broadcast
//(otherwise it's timelocked refunded back to the sender). From then on, there
//is no additional output in Commitment Txes. [side caveat, first payment must
//be above minimum UTXO output size in single-funder] For now, let's keep it
//simple and assume dual funder (with both funding above reserve)
func createCLTVFundingTx(fundingTimeLock int64, ourKey *btcec.PublicKey, theirKey *btcec.PublicKey) (*wire.MsgTx, error) {
script := txscript.NewScriptBuilder()
//In the scriptSig on the top of the stack, there will be either a 0 or
//1 pushed.
//So the scriptSig will be either:
//<BobSig> <AliceSig> <1>
//<BobSig> <RevocationHash> <0>
//(Alice and Bob can be swapped depending on who's funding)
//If this is a 2-of-2 multisig, read the first sig
script.AddOp(txscript.OP_IF)
//Sig2 (not P2PKH, the pubkey is in the redeemScript)
script.AddData(ourKey.SerializeCompressed())
script.AddOp(txscript.OP_CHECKSIGVERIFY) //gotta be verify!
//If this is timed out
script.AddOp(txscript.OP_ELSE)
script.AddInt64(fundingTimeLock)
script.AddOp(txscript.OP_NOP2) //CLTV
//Sig (not P2PKH, the pubkey is in the redeemScript)
script.AddOp(txscript.OP_CHECKSIG)
script.AddOp(txscript.OP_DROP)
script.AddOp(txscript.OP_ENDIF)
//Read the other sig if it's 2-of-2, only one if it's timed out
script.AddData(theirKey.SerializeCompressed())
script.AddOp(txscript.OP_CHECKSIG)
fundingTx := wire.NewMsgTx()
//TODO(j) Add the inputs/outputs
return fundingTx, nil
}