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authorZmnSCPxj <ZmnSCPxj@protonmail.com>2023-10-23 11:10:56 +0000
committerbitcoindev <bitcoindev@gnusha.org>2023-10-23 11:11:08 +0000
commit790df5d8ddff10385d5ed881529f1084b7cbb5dc (patch)
tree4d6ab1de80d8a7860a7da0b6a943f9478a15d9cb
parentc431aee39edc701da31ff46e7067aa708ac61fba (diff)
downloadpi-bitcoindev-790df5d8ddff10385d5ed881529f1084b7cbb5dc.tar.gz
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Re: [bitcoin-dev] [Lightning-dev] OP_Expire and Coinbase-Like Behavior: Making HTLCs Safer by Letting Transactions Expire Safely
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+Date: Mon, 23 Oct 2023 11:10:56 +0000
+To: Peter Todd <pete@petertodd.org>
+From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
+Message-ID: <o2Dp_FkSCCwB6Mo9dePXgvxwQeKcmDwK_fNK6bhHPrsYIC6KaoeTtfHh8kv2NGHqkJhppNmEvRZGTly1Zs3Of1gIfl76iNQgCZaNJ-bJqgE=@protonmail.com>
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+Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>,
+ security@ariard.me, "lightning-dev\\\\\\\\@lists.linuxfoundation.org"
+ <lightning-dev@lists.linuxfoundation.org>
+Subject: Re: [bitcoin-dev] [Lightning-dev] OP_Expire and Coinbase-Like
+ Behavior: Making HTLCs Safer by Letting Transactions Expire Safely
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+
+Hi all,
+
+This was discussed partially on the platform formerly known as twitter, but=
+ an alternate design goes like this:
+
+* Add an `nExpiryTime` field in taproot annex.
+ * This indicates that the transaction MUST NOT exist in a block at or abo=
+ve the height specified.
+ * Mempool should put txes buckets based on `nExpiryTime`, and if the bloc=
+k is reached, drop all the buckets with `nExpiryTime` less than that block =
+height.
+* Add an `OP_CHECKEXPIRYTIMEVERIFY` opcode, mostly similar in behavior to `=
+OP_EXPIRE` proposed by Peter Todd:
+ * Check if `nExpiryTime` exists and has value equal or less than the stac=
+k top.
+
+The primary difference is simply that while Peter proposes an implicit fiel=
+d for the value that `OP_EXPIRE` will put in `CTransaction`, I propose an e=
+xplicit field for it in the taproot annex.
+
+The hope is that "explicit is better than implicit" and that the design wil=
+l be better implemented as well by non-Bitcoin-core implementations, as the=
+ use of tx buckets is now explicit in treating the `nExpiryTime` field.
+
+Regards,
+ZmnSCPxj
+