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Builder->Proposer Payment Transfer Unbundle
⚠️ TLDR; A blocknative proposer payment for slot X (mev-boost) was found in slot X + 84 (non-mev-boost) and detected in the public mempool. The validator for both slots belong to the same pool according to beaconcha.in.
working backwards
0xbae...
from our builder address0xbaf..
at slot =6260437
account balance delta > excess transfer gas
, only triggered when purposefully removing fundsFact finding lead to the following observations:
6260353
6260353
was missed on beacon chain160376265645027208 wei
in the future block at slot6260437
correlates to the bid value from blocknative builder at prior missed slot6260353
- our mempool archive detected the builder's payment tx hash
0xbae..
as pending at block 17084002 which is the canonical tip at time of missed slot:slot 6260353 relay timing info
Apr-19-2023 19:50:59
per beaconcha.inBelow times are UTC, above is UTC-4
2023-04-19T23:50:59.501719962Z
2023-04-19T23:51:00.306691172Z
2023-04-19T23:51:01.027018992Z
2023-04-19T23:51:02.027155397Z
23:51:02 - 23:50:59 = 2.02s
for the proposer to prop + assume~300ms
for relay -> proposer transport gives~1.75s
for proposer to propquestions
possible mitigations