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29029df5c700e6940c712028303761d91ae15847 [doc] v3 signaling in mempool-replacements.md (glozow)
e643ea795e4b6fea4a6bbb3d72870ee6a4c836b1 [fuzz] v3 transactions and sigop-adjusted vsize (glozow)
1fd16b5c62f54c7f4c60122acd65d852f63d1e8b [functional test] v3 transaction submission (glozow)
27c8786ba918a42c860e6a50eaee9fdf56d7c646 test framework: Add and use option for tx-version in MiniWallet methods (MarcoFalke)
9a1fea55b29fe025355b06b45e3d77d192acc635 [policy/validation] allow v3 transactions with certain restrictions (glozow)
eb8d5a2e7d939dd3ee683486e98702079e0dfcc0 [policy] add v3 policy rules (glozow)
9a29d470fbb62bbb27d517efeafe46ff03c25f54 [rpc] return full string for package_msg and package-error (glozow)
158623b8e0726dff7eae4288138f1710e727db9c [refactor] change Workspace::m_conflicts and adjacent funcs/structs to use Txid (glozow)
Pull request description:
See #27463 for overall package relay tracking.
Delving Bitcoin discussion thread: https://delvingbitcoin.org/t/v3-transaction-policy-for-anti-pinning/340
Delving Bitcoin discussion for LN usage: https://delvingbitcoin.org/t/lightning-transactions-with-v3-and-ephemeral-anchors/418
Rationale:
- There are various pinning problems with RBF and our general ancestor/descendant limits. These policies help mitigate many pinning attacks and make package RBF feasible (see #28984 which implements package RBF on top of this). I would focus the most here on Rule 3 pinning. [1][2]
- Switching to a cluster-based mempool (see #27677 and #28676) requires the removal of CPFP carve out, which applications depend on. V3 + package RBF + ephemeral anchors + 1-parent-1-child package relay provides an intermediate solution.
V3 policy is for "Priority Transactions." [3][4] It allows users to opt in to more restrictive topological limits for shared transactions, in exchange for the more robust fee-bumping abilities that offers. Even though we don't have cluster limits, we are able to treat these transactions as having as having a maximum cluster size of 2.
Immediate benefits:
- You can presign a transaction with 0 fees (not just 1sat/vB!) and add a fee-bump later.
- Rule 3 pinning is reduced by a significant amount, since the attacker can only attach a maximum of 1000vB to your shared transaction.
This also enables some other cool things (again see #27463 for overall roadmap):
- Ephemeral Anchors
- Package RBF for these 1-parent-1-child packages. That means e.g. a commitment tx + child can replace another commitment tx using the child's fees.
- We can transition to a "single anchor" universe without worrying about package limit pinning. So current users of CPFP carve out would have something else to use.
- We can switch to a cluster-based mempool [5] (#27677 #28676), which removes CPFP carve out [6].
[1]: Original mailing list post and discussion about RBF pinning problems https://gist.github.com/glozow/25d9662c52453bd08b4b4b1d3783b9ff, https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-January/019817.html
[2]: A FAQ is "we need this for cluster mempool, but is this still necessary afterwards?" There are some pinning issues that are fixed here and not fully fixed in cluster mempool, so we will still want this or something similar afterward.
[3]: Mailing list post for v3 https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-September/020937.html
[4]: Original PR #25038 also contains a lot of the discussion
[5]: https://delvingbitcoin.org/t/an-overview-of-the-cluster-mempool-proposal/393/7
[6]: https://delvingbitcoin.org/t/an-overview-of-the-cluster-mempool-proposal/393#the-cpfp-carveout-rule-can-no-longer-be-supported-12
ACKs for top commit:
sdaftuar:
ACK 29029df5c700e6940c712028303761d91ae15847
achow101:
ACK 29029df5c700e6940c712028303761d91ae15847
instagibbs:
ACK 29029df5c700e6940c712028303761d91ae15847 modulo that
Tree-SHA512: 9664b078890cfdca2a146439f8835c9d9ab483f43b30af8c7cd6962f09aa557fb1ce7689d5e130a2ec142235dbc8f21213881baa75241c5881660f9008d68450
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DEFAULT_PERMIT_BAREMULTISIG
7b45744df33c6a4759eae1a3984f389cbac837c2 tests: ensure functional tests set permitbaremultisig=1 when needed (Anthony Towns)
7dfabdcf860c529772a54b0e8fa235cbb4a78b4d tests: test both settings for permitbaremultisig in p2sh tests (Anthony Towns)
Pull request description:
Update unit and functional tests so that they continue to work if the default for `-permitbaremultisig` is changed.
ACKs for top commit:
maflcko:
lgtm ACK 7b45744df33c6a4759eae1a3984f389cbac837c2
instagibbs:
crACK https://github.com/bitcoin/bitcoin/pull/29088/commits/7b45744df33c6a4759eae1a3984f389cbac837c2
ajtowns:
> crACK [7b45744](https://github.com/bitcoin/bitcoin/commit/7b45744df33c6a4759eae1a3984f389cbac837c2)
achow101:
ACK 7b45744df33c6a4759eae1a3984f389cbac837c2
glozow:
ACK 7b45744df33c6a4759eae1a3984f389cbac837c2, changed default locally and all tests passed
Tree-SHA512: f89f9e2bb11f07662cfd57390196df9e531064e1bd662e1db7dcfc97694394ae5e8014e9d209b9405aa09195bf46fc331b7fba10378065cdb270cbd0669ae904
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The mempool_dust and mempool_sigoplimits functional tests both use bare
multisig txs, so ensure they're allowed by policy.
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Behavior prior to this commit allows some transactions to
enter into the local mempool but not be reported to the user
when encountering a PackageValidationResult::PCKG_TX result.
This is further compounded with the fact that any transactions
submitted to the mempool during this call would also not be
relayed to peers, resulting in unexpected behavior.
Fix this by, if encountering a package error, reporting all
wtxids, along with a new error field, and broadcasting every
transaction that was found in the mempool after submission.
Note that this also changes fees and vsize to optional,
which should also remove an issue with other-wtxid cases.
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