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author | Antoine Poinsot <darosior@protonmail.com> | 2021-09-02 13:41:28 +0200 |
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committer | Antoine Poinsot <darosior@protonmail.com> | 2021-09-02 13:41:28 +0200 |
commit | d873db7f8ff37c37f9c72482d8ecd52282f4438e (patch) | |
tree | 9b7a50cdb6a1e484cf8a3da018ff63e866903977 /src/policy/policy.cpp | |
parent | b997dd211ecfe5d0d6f757b8426ad81e40219143 (diff) | |
download | bitcoin-d873db7f8ff37c37f9c72482d8ecd52282f4438e.tar.xz |
policy: document we intentionally don't lower the dust threshold for Taproot
A "correction" of what seemed to be an overlook was initially proposed in
PR #22779. It was deemed unnecessary to further reduce the dust level,
so document the intention.
Signed-off-by: Antoine Poinsot <darosior@protonmail.com>
Diffstat (limited to 'src/policy/policy.cpp')
-rw-r--r-- | src/policy/policy.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp index 9e433584e7..fced397e51 100644 --- a/src/policy/policy.cpp +++ b/src/policy/policy.cpp @@ -22,7 +22,7 @@ CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFeeIn) // so dust is a spendable txout less than // 182*dustRelayFee/1000 (in satoshis). // 546 satoshis at the default rate of 3000 sat/kvB. - // A typical spendable segwit txout is 31 bytes big, and will + // A typical spendable segwit P2WPKH txout is 31 bytes big, and will // need a CTxIn of at least 67 bytes to spend: // so dust is a spendable txout less than // 98*dustRelayFee/1000 (in satoshis). @@ -34,6 +34,11 @@ CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFeeIn) int witnessversion = 0; std::vector<unsigned char> witnessprogram; + // Note this computation is for spending a Segwit v0 P2WPKH output (a 33 bytes + // public key + an ECDSA signature). For Segwit v1 Taproot outputs the minimum + // satisfaction is lower (a single BIP340 signature) but this computation was + // kept to not further reduce the dust level. + // See discussion in https://github.com/bitcoin/bitcoin/pull/22779 for details. if (txout.scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram)) { // sum the sizes of the parts of a transaction input // with 75% segwit discount applied to the script size. |