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wallet privacy
50fc4df6c4e8a84bdda13ade7bed7a2131796f00 [mempool] Persist unbroadcast set to mempool.dat (Amiti Uttarwar)
297a1785360c4db662a7f3d3ade7b6b503258d39 [test] Integration tests for unbroadcast functionality (Amiti Uttarwar)
6851502472d3625416f0e7796e9f2a0379d14d49 [refactor/test] Extract P2PTxInvStore into test framework (Amiti Uttarwar)
dc1da48dc5e5526215561311c184a8cbc345ecdc [wallet] Update the rebroadcast frequency to be ~1/day. (Amiti Uttarwar)
e25e42f20a3aa39651fbc1f9fa3df1a49f1f5868 [p2p] Reattempt initial send of unbroadcast transactions (Amiti Uttarwar)
7e93eecce3bc5a1b7bb0284e06f9e2e69454f5ba [util] Add method that returns random time in milliseconds (Amiti Uttarwar)
89eeb4a3335f8e871cc3f5286af4546dff66172a [mempool] Track "unbroadcast" transactions (Amiti Uttarwar)
Pull request description:
This PR introduces mempool tracking of unbroadcast transactions and periodic reattempts at initial broadcast. This is a part of the rebroadcast project, and a standalone privacy win.
The current rebroadcast logic is terrible for privacy because 1. only the source wallet rebroadcasts transactions and 2. it does so quite frequently. In the current system, if a user submits a transaction that does not immediately get broadcast to the network (eg. they are offline), this "rebroadcast" behavior is the safety net that can actually serve as the initial broadcast. So, keeping the attempts frequent is important for initial delivery within a reasonable timespan.
This PR aims to improve # 2 by reducing the wallet rebroadcast frequency to ~1/day from ~1/15 min. It achieves this by separating the notion of initial broadcast from rebroadcasts. With these changes, the mempool tracks locally submitted transactions & periodically reattempts initial broadcast. Transactions submitted via the wallet or RPC are added to an "unbroadcast" set & are removed when a peer sends a `getdata` request, or the transaction is removed from the mempool. Every 10-15 minutes, the node reattempts an initial broadcast. This enables reducing the wallet rebroadcast frequency while ensuring the transactions will be propagated to the network.
For privacy improvements around # 1, please see #16698.
Thank you to gmaxwell for the idea of how to break out this subset of functionality (https://github.com/bitcoin/bitcoin/pull/16698#issuecomment-571399346)
ACKs for top commit:
fjahr:
Code review ACK 50fc4df6c4e8a84bdda13ade7bed7a2131796f00
MarcoFalke:
ACK 50fc4df6c4e8a84bdda13ade7bed7a2131796f00, I think this is ready for merge now 👻
amitiuttarwar:
The current tip `50fc4df` currently has 6 ACKs on it, so I've opened #18807 to address the last bits.
jnewbery:
utACK 50fc4df6c4e8a84bdda13ade7bed7a2131796f00.
ariard:
Code Review ACK 50fc4df (minor points no need to invalid other ACKs)
robot-visions:
ACK 50fc4df6c4e8a84bdda13ade7bed7a2131796f00
sipa:
utACK 50fc4df6c4e8a84bdda13ade7bed7a2131796f00
naumenkogs:
utACK 50fc4df
Tree-SHA512: 2dd935d645d5e209f8abf87bfaa3ef0e4492705ce7e89ea64279cb27ffd37f4727fa94ad62d41be331177332f8edbebf3c7f4972f8cda10dd951b80a28ab3c0f
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Since the mempool unbroadcast mechanism handles the reattempts for initial
broadcast, the wallet rebroadcast attempts can be much less frequent
(previously ~1/30 min)
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-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-
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fafe5f0d09 test: Remove unused imports (MarcoFalke)
fa16a09215 scripted-diff: use self.sync_* methods (MarcoFalke)
faf77f9b90 test: Pass self to test_simple_bumpfee_succeeds (MarcoFalke)
fa6dc7c5c3 test: Add BitcoinTestFramework::sync_* methods (MarcoFalke)
fafe008cb4 test: Pass at most one node group to sync_all (MarcoFalke)
fa4680ed09 scripted-diff: Rename sync_blocks to send_blocks to avoid name collisions and confusion (MarcoFalke)
Pull request description:
This adds methods to the test framework that can be called by just `self.sync_*()`.
This avoids having to import the underlying util method. Also, in the default case, where all nodes are synced this avoid having to pass `self.nodes` explicitly.
So the effective changes are:
```diff
@@
-from test_framework.util import sync_blocks, sync_mempools
@@
- sync_blocks(self.nodes)
+ self.sync_blocks()
@@
- sync_mempools(self.nodes)
+ self.sync_mempools()
ACKs for commit fafe5f:
promag:
utACK fafe5f0.
jonatack:
ACK https://github.com/bitcoin/bitcoin/pull/15773/commits/fafe5f0d09db6778173a1079d93c314e9317708c, nice simplification.
Tree-SHA512: 5c81840edf9fb3c5de2d7bf95ca36a5a8d23567cd1479a0f4044547c2080e9a3c5cf375357bc8eebb5b68829be050a171ab2512cfd47b89feed51fe3bad2cd72
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Removes the now-unused Broadcast/ResendWalletTransactions interface from
validationinterface.
The wallet_resendwallettransactions.py needs a sleep added at the start
to make sure that the rebroadcast scheduler is warmed up before the next
block is mined.
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The existing wallet_resendwallettransactions.py test only tests the
resendwallettransactions RPC. It does not test whether transactions are
actually rebroadcast, or whether the rebroadcast logic is called on a
timer.
This commit updates the test to not use the resendwallettransactions RPC and
test that transactions are rebroadcast on a timer.
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