## Low participation in Hive issue ### Anomalies overview 1. Hive counts participation in another manner, not like us. Hive participation data for 1 epoch: ``` ["7","7","7","7","7","7","7","7", "7","0","7","7","7","7","7","7", "7","7","7","7","7","7","7","7", "7","7","7","7","0","7","7","7", "7","0","7","7","7","7","7","7", "7","7","7","7","7","7","7","7", "7","7","7","0","7","7","7","7", "7","7","7","7","7","7","7","7"] ``` While our data shows 2 non-7 misses in participation of the same epoch: 9 and 33. Hive counts 2 more gaps. - Clarified: Hive always misses 1 slot attestations in calculation, so maximum participation is 0.97, though requirement is 0.95, so there is some area for client to miss. So when we get 0.97, it's not an our issue of missing 0.03 2. ~~4 seconds delay in 6 seconds slot between aggregation and attestation~~. All ok, Early attestation feature 3. Failed to publish attestation on gossip topic error while no disconnections were detected - Clarified: subscription to the topic was initiated later by another peer, submitted PR https://github.com/ethereum/hive/pull/653 4. Aggregations were not gossiped, clarified, Adrian made fix: https://github.com/ConsenSys/teku/pull/6276 5. There is 1 known case when locally produced aggregation was not used on the next and subsequent slots when producing blocks - investigating --- ### 1 detailed case Participation by Hive view: ``` ["7","7","7","0","7","7","7","7", "7","3","7","7","0","7","7","7", "7","7","7","7","7","7","7","7", "7","7","7","7","3","7","7","7", "7","7","7","7","0","7","7","7", "0","7","7","7","7","7","7","7", "7","7","7","7","7","7","7","7", "7","7","7","7","7","7","7","7"] ``` Aggregate inclusions in block by slot: ``` slot: vc-2ca2,vc-bc61 64: ,2 65: 0, 66: 2, 67: ,4 (found from 64) 68: ,2 69: ,2 70: ,2 71: ,2 72: ,2 73: ,2 74: ,2 75: 2, 76: 2, 77: ,2 78: ,2 79: ,2 80: 2, 81: 2, 82: 2, 83: 2, 84: ,2 85: 2, 86: 2, 87: 2, 88: 2, 89: 2, 90: ,2 91: ,0 (lost forever) 92: ,2 93: ,2 94: ,2 95: ,2 96: 0, 97: ,4 (found from 95) ``` #### 64th slot attestation **vc-bc61** (connected to **bn-d7fc**): ``` 2022-09-29 18:44:45.147 INFO - Signing attestation in slot 64 with data AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}} for validator a5a3303 2022-09-29 18:44:45.161 INFO - Signing attestation in slot 64 with data AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}} for validator 89ff903 2022-09-29 18:44:45.194 INFO - Validator *** Published attestation Count: 2, Slot: 64, Root: c97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125 2022-09-29 18:44:49.006 INFO - Attestation aggregate bits: SszBitlist{size=2, 11} 2022-09-29 18:44:49.086 INFO - Validator *** Published aggregate Count: 1, Slot: 64, Root: c97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125 ``` later ``` 2022-09-29 18:45:03.023 INFO - Block attestations: Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=66, index=0, beacon_block_root=0x507fdfe9585c224af9c85164ca51f820a21ab36fa1175907de4b08aec54b4575, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8294877f3531af27106713eb0d233b2b845878e5b140aa398ea1aa53d3b76ee03c9bfd33deb3a11aea7e6424a52ba9c60079fa25614b735fea083c6e3e3bd184e86a0010b2b6162dd0894bb70d75664cb16738a1527e7306755e0a56b79b84ea}},Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x865b80bd99a9d90f180a0010f87c77384c504046bccb9f1f7b3785574c1cc807fb57a571263eddd739f74542c23c82550609d74b6921950dd9e70a7fa799f3ee0a37e986f3da4c166e1c2bcc6b93059a91d8cc72e481131738d12b4a1966f7f0}} 2022-09-29 18:45:03.047 INFO - Validator *** Published block Count: 1, Slot: 67, Root: b82d1bdd0f18423f70a831ea704b456f109e923b194c871691dd2d1a8f3ba9f9, 0 (0%) gas, EL block: f9dbfcac96c758f9bac8e44cc2cef4846ccccb2f64afb8fe906583ae9db88e3e (105) ``` **vc-2ca2** (connected to **bn-defe**): ``` 2022-09-29 18:44:51.007 INFO - Block attestations: 2022-09-29 18:44:51.041 INFO - Validator *** Published block Count: 1, Slot: 65, Root: 77cafc3d58c328ba9d0eb321c9dacae3ea6edde3d6f810be8e1cf9a3fb21dde2, 0 (0%) gas, EL block: a8b2e46eddb0c361bd7da04124db4d3237e5b6b5c37b2030d7901a3e3f99797b (103) ``` **bn-d7fc:** ``` 2022-09-29 18:44:45.192 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@f0daefd3, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 01}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xb8f019837b7f6415d1507b86a7581b4ba3a064ff2c191086c80a307fd06e49ac73c1fdc265adf0d469d9562e298fe0800229c67c51fbe1e10713291cdba86387bfbc2b13413f7c15b3cb7f6477fe2095d19eac6f1846e8650c8b71b805fd66a1}}, maybeAggregate=Optional.empty, hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2412/0x0000000800916908@6efde367), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=1: 28}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xb8f019837b7f6415d1507b86a7581b4ba3a064ff2c191086c80a307fd06e49ac73c1fdc265adf0d469d9562e298fe0800229c67c51fbe1e10713291cdba86387bfbc2b13413f7c15b3cb7f6477fe2095d19eac6f1846e8650c8b71b805fd66a1}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} 2022-09-29 18:44:45.193 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@f0daefd3, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 10}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xb02ea5b143586d41fb10eba88f4a50430ed17cccfeb4673468eeab8e3188eae1134d1ca10771186c637e62687b1dad9d147e34520100b51c14da9155fac00694102d0a1b6e4834d04cc5bb9897be072e1a53af8bbfd78de460ce61d32c400780}}, maybeAggregate=Optional.empty, hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2412/0x0000000800916908@240e0fdf), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=1: 9}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xb02ea5b143586d41fb10eba88f4a50430ed17cccfeb4673468eeab8e3188eae1134d1ca10771186c637e62687b1dad9d147e34520100b51c14da9155fac00694102d0a1b6e4834d04cc5bb9897be072e1a53af8bbfd78de460ce61d32c400780}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} 2022-09-29 18:44:49.085 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@f0daefd3, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x865b80bd99a9d90f180a0010f87c77384c504046bccb9f1f7b3785574c1cc807fb57a571263eddd739f74542c23c82550609d74b6921950dd9e70a7fa799f3ee0a37e986f3da4c166e1c2bcc6b93059a91d8cc72e481131738d12b4a1966f7f0}}, maybeAggregate=Optional[SignedAggregateAndProof{message=AggregateAndProof{aggregator_index=28, aggregate=Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x865b80bd99a9d90f180a0010f87c77384c504046bccb9f1f7b3785574c1cc807fb57a571263eddd739f74542c23c82550609d74b6921950dd9e70a7fa799f3ee0a37e986f3da4c166e1c2bcc6b93059a91d8cc72e481131738d12b4a1966f7f0}}, selection_proof=SszByteVector{0xabba52f2908d9667a84f7ea7139f0be5423717db8c8a36148287c2851df14fe3b58a0ffa271f3efc065c62ba1a40531c1858516209ee2159812e05ddc7847a3e6bd2e686de632f3a96f7b265ee581c61d106a71182d84abc06164c449feda59d}}, signature=SszByteVector{0xb5f312a9ee25d560cf3be3f0e40d2eccddf030c8b0370b0a322d7e08609a47428327a4e593c878c01b5b0f14f6de8f2d118b15a1f608817f7af44303b3931a8b1fd380065a52d5a71c7314d9ccd34e31ef93fd223299ede036506324472afbf7}}], hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2412/0x0000000800916908@66da7ea9), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=2: 9, 28}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x865b80bd99a9d90f180a0010f87c77384c504046bccb9f1f7b3785574c1cc807fb57a571263eddd739f74542c23c82550609d74b6921950dd9e70a7fa799f3ee0a37e986f3da4c166e1c2bcc6b93059a91d8cc72e481131738d12b4a1966f7f0}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} ``` **bn-defe**: ``` 2022-09-29 18:44:45.193 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@b67d91ed, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 01}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xb8f019837b7f6415d1507b86a7581b4ba3a064ff2c191086c80a307fd06e49ac73c1fdc265adf0d469d9562e298fe0800229c67c51fbe1e10713291cdba86387bfbc2b13413f7c15b3cb7f6477fe2095d19eac6f1846e8650c8b71b805fd66a1}}, maybeAggregate=Optional.empty, hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2237/0x00000008008ec0c8@253b80fc), gossiped=false, producedLocally=false, isValidIndexedAttestation=false, indexedAttestation=Optional.empty, committeeShufflingSeed=Optional.empty, receivedSubnetId=OptionalInt[0]} 2022-09-29 18:44:45.194 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@b67d91ed, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 10}, data=AttestationData{slot=64, index=0, beacon_block_root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xb02ea5b143586d41fb10eba88f4a50430ed17cccfeb4673468eeab8e3188eae1134d1ca10771186c637e62687b1dad9d147e34520100b51c14da9155fac00694102d0a1b6e4834d04cc5bb9897be072e1a53af8bbfd78de460ce61d32c400780}}, maybeAggregate=Optional.empty, hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2237/0x00000008008ec0c8@109ba294), gossiped=false, producedLocally=false, isValidIndexedAttestation=false, indexedAttestation=Optional.empty, committeeShufflingSeed=Optional.empty, receivedSubnetId=OptionalInt[0]} ``` **Summary**: Aggregate attestation was not received by other peer by unknown reason, but was later included in block when the same vc was chosen as the next block producer. I should find the reason why aggegate attestations are lost in such cases. #### 90th slot attestation **vc-2ca2** (connected to **bn-defe**): ``` 2022-09-29 18:47:21.348 INFO - Signing attestation in slot 90 with data AttestationData{slot=90, index=0, beacon_block_root=0x1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}} for validator 8429e93 2022-09-29 18:47:21.374 INFO - Validator *** Published attestation Count: 2, Slot: 90, Root: 1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004 2022-09-29 18:47:25.007 INFO - Attestation aggregate bits: SszBitlist{size=2, 11} 2022-09-29 18:47:25.089 INFO - Validator *** Published aggregate Count: 1, Slot: 90, Root: 1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004 ``` **vc-bc61** (connected to **bn-d7fc**): ``` 2022-09-29 18:47:27.024 INFO - Block attestations: [] 2022-09-29 18:47:27.047 INFO - Validator *** Published block Count: 1, Slot: 91, Root: b332f3a89cd6ca56e343c5e13f8df105e8cd3c16be9a68ab331485d9e0bbc956, 0 (0%) gas, EL block: c56739dea5f94d26cb1739dc8b8a3625d3957d7d2a02380de158ebeb4324d3a9 (129) ``` **bn-defe**: ``` 2022-09-29 18:47:21.374 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@b67d91ed, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 10}, data=AttestationData{slot=90, index=0, beacon_block_root=0x1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xaf56c2a438d7ddd495df71ac77b9235f94b650d6a349321b98f6f59a47a73cee27d1f47a359b72a971e8058e9a2e40ee03aa29aa370a13f6949e6afe36c47924acd8d0d8e2b4452c63884d3b62b57549479310be6037ed26e28d4e0db0dc0583}}, maybeAggregate=Optional.empty, hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2237/0x00000008008ec0c8@de90bf8), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=1: 36}, data=AttestationData{slot=90, index=0, beacon_block_root=0x1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xaf56c2a438d7ddd495df71ac77b9235f94b650d6a349321b98f6f59a47a73cee27d1f47a359b72a971e8058e9a2e40ee03aa29aa370a13f6949e6afe36c47924acd8d0d8e2b4452c63884d3b62b57549479310be6037ed26e28d4e0db0dc0583}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} 2022-09-29 18:47:21.374 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@b67d91ed, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 01}, data=AttestationData{slot=90, index=0, beacon_block_root=0x1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xa1a097df43dc83675037fafff9ba9d88dfc16efc35deca49889dfef69b9383ce6a61a1fdaa91c973a1805214ca7c99b400b9d3d5ec8aac844a1486bd4d3df377703817190a154db85675cf3de2565117c190bad0493563199b94b3c795a15b87}}, maybeAggregate=Optional.empty, hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2237/0x00000008008ec0c8@17ed901f), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=1: 40}, data=AttestationData{slot=90, index=0, beacon_block_root=0x1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0xa1a097df43dc83675037fafff9ba9d88dfc16efc35deca49889dfef69b9383ce6a61a1fdaa91c973a1805214ca7c99b400b9d3d5ec8aac844a1486bd4d3df377703817190a154db85675cf3de2565117c190bad0493563199b94b3c795a15b87}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} 2022-09-29 18:47:21.374 WARN - Failed to publish attestations(s) for slot 90 because no peers were available on the required gossip topic 2022-09-29 18:47:23.312 INFO - Slot Event *** Slot: 90, Block: 1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, Justified: 0, Finalized: 0, Peers: 1 2022-09-29 18:47:25.089 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@b67d91ed, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=90, index=0, beacon_block_root=0x1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x92d959bfc94228347dd791ed821c037d409a24f0dac740313cadb3566cdba1326f3a49a5eb409a6ec216393aeeea89ee1566f928d6b9dccf615656debbbbba14e4e7aa670ccbd98f9c5eada7724b73e0417f154f396519c04249971295c165c0}}, maybeAggregate=Optional[SignedAggregateAndProof{message=AggregateAndProof{aggregator_index=36, aggregate=Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=90, index=0, beacon_block_root=0x1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x92d959bfc94228347dd791ed821c037d409a24f0dac740313cadb3566cdba1326f3a49a5eb409a6ec216393aeeea89ee1566f928d6b9dccf615656debbbbba14e4e7aa670ccbd98f9c5eada7724b73e0417f154f396519c04249971295c165c0}}, selection_proof=SszByteVector{0xad067c9ee3e82ee31d827a356977cef8eaab644050e72d0319d77a1364dfaed55b5a2d2991a93f2e7a95aa777730a2dc0ddc60eea5ca0dfc99cbb7b65069f9fad11f352fe5f8ef076e697006236da92ec986ee50b851817f0aacbc4a2c9881a4}}, signature=SszByteVector{0xa12b39f1e77857e58fa9a900bf11e7a65c93edc599d52adb6a90e54fb26b9fba13f723ba0dbe627871aff24cb5cbbaff14a6aba43ade89ccbbf3982ab433782b2a3695c79a6a797d0369711953b45516ffd14f75f53d45512f7579975e62577b}}], hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2237/0x00000008008ec0c8@551a953a), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=2: 36, 40}, data=AttestationData{slot=90, index=0, beacon_block_root=0x1b24042514e7c3f1a1e0383d5d50a59d5a2dbf126482da9da404935ff46fc004, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x92d959bfc94228347dd791ed821c037d409a24f0dac740313cadb3566cdba1326f3a49a5eb409a6ec216393aeeea89ee1566f928d6b9dccf615656debbbbba14e4e7aa670ccbd98f9c5eada7724b73e0417f154f396519c04249971295c165c0}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} ``` **bn-d7fc**: nothing interesting **Summary**: Single attestations was not gossiped with error reason "no peers were available on the required gossip topic". Aggregate attestation was produced but was not later included in block when same vc was chosen as the next block producer. I should find the reason why there were no peers on this topic, why gossip was not replayed later. I should find the reason why being later a block producer vc didn't include this attestation in block. #### 95th slot attestation **vc-bc61** (connected to **bn-d7fc**): ``` 2022-09-29 18:47:51.152 INFO - Signing attestation in slot 95 with data AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}} for validator 8dcd8d9 2022-09-29 18:47:51.162 INFO - Signing attestation in slot 95 with data AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}} for validator 8ffa99a 2022-09-29 18:47:51.206 INFO - Validator *** Published attestation Count: 2, Slot: 95, Root: 3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b 2022-09-29 18:47:55.005 INFO - Attestation aggregate bits: SszBitlist{size=2, 11} 2022-09-29 18:47:55.080 INFO - Validator *** Published aggregate Count: 1, Slot: 95, Root: 3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b ``` later ``` 2022-09-29 18:48:03.017 INFO - Block attestations: Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=96, index=0, beacon_block_root=0x96c59d7bdf7e0009d0954491c563243a89ec144c73ab356c713810f0268120d3, source=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}, target=Checkpoint{epoch=3, root=0x96c59d7bdf7e0009d0954491c563243a89ec144c73ab356c713810f0268120d3}}, signature=SszByteVector{0xb77809f622334b7b1f9b17bfbe16a964ca9e453d450f92c080f73952fade5801d5ff703f745cb085f4cf81a0f2acb47a11f8d72f06dd7ac55f90908a81ccc0782efabf9ee5c82990f514cedaa244a34aef77a6236ec79dbf8b8d8c61c1b9cd34}},Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8f93f39c11345f89a3a72f5656398aa864077daaaacad0a5f3c3cd2f2ba83851d395067a9db6b2033f50107bf3a36cf0114209c5f15888da506395d7de18ca3ff204d36dd4d012a0ee827e99e47b154c1dd6260008cfd0f8fc6a2a1f1ecddbb5}} 2022-09-29 18:48:03.029 INFO - Validator *** Published block Count: 1, Slot: 97, Root: daf49fbc69fb755d1e0f806e8692877c49670e4bd21a6a2a7d0c41217ea4faf6, 0 (0%) gas, EL block: 49129590c64cc96b4493ee392dd07f3eba9c6c2fc1d5d77b8ab3069844aa5834 (135) ``` **vc-2ca2** (connected to **bn-defe**): ``` 2022-09-29 18:47:57.015 INFO - Block attestations: [] 2022-09-29 18:47:57.035 INFO - Validator *** Published block Count: 1, Slot: 96, Root: 96c59d7bdf7e0009d0954491c563243a89ec144c73ab356c713810f0268120d3, 0 (0%) gas, EL block: 840ccd1d13f7b76ce7facb612e00e350978cd895e3b1e1c359409c265d010bc6 (134) ``` **bn-d7fc**: ``` 2022-09-29 18:47:51.201 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@f0daefd3, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 10}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x87fd632118a45446a1fa94960a359e9b210ca63283e866ec80b6259c9df5bfb4d3a2ebe3573c00050db96fb0ea7c5caf0a34d6eaedb7c80f999ba463873ff330bacfa7373518c3fdfd25175f96abb49bd33b1a5caa37a843ef2861c135986dab}}, maybeAggregate=Optional.empty, hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2412/0x0000000800916908@1d22a0c3), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=1: 3}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x87fd632118a45446a1fa94960a359e9b210ca63283e866ec80b6259c9df5bfb4d3a2ebe3573c00050db96fb0ea7c5caf0a34d6eaedb7c80f999ba463873ff330bacfa7373518c3fdfd25175f96abb49bd33b1a5caa37a843ef2861c135986dab}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} 2022-09-29 18:47:51.201 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@f0daefd3, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 01}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8012aa468fbcb413e7280aa844f416144e4154d4e14a136903e75e41e1914a2ea4375ec1f95005ec1712f6c812dde5c715c0e73def919b5fb0dee5e1496a9c5dbb30fb92b1560d561889546a13ddbda1832d50f27f0d14d0f9331b5c1d74634e}}, maybeAggregate=Optional.empty, hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2412/0x0000000800916908@38866cb7), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=1: 12}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8012aa468fbcb413e7280aa844f416144e4154d4e14a136903e75e41e1914a2ea4375ec1f95005ec1712f6c812dde5c715c0e73def919b5fb0dee5e1496a9c5dbb30fb92b1560d561889546a13ddbda1832d50f27f0d14d0f9331b5c1d74634e}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} 2022-09-29 18:47:51.202 WARN - Failed to publish attestations(s) for slot 95 because no peers were available on the required gossip topic 2022-09-29 18:47:53.134 INFO - Slot Event *** Slot: 95, Block: 3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, Justified: 0, Finalized: 0, Peers: 1 2022-09-29 18:47:55.080 INFO - onAttestation: ValidateableAttestation{spec=tech.pegasys.teku.spec.Spec@f0daefd3, attestation=Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8f93f39c11345f89a3a72f5656398aa864077daaaacad0a5f3c3cd2f2ba83851d395067a9db6b2033f50107bf3a36cf0114209c5f15888da506395d7de18ca3ff204d36dd4d012a0ee827e99e47b154c1dd6260008cfd0f8fc6a2a1f1ecddbb5}}, maybeAggregate=Optional[SignedAggregateAndProof{message=AggregateAndProof{aggregator_index=12, aggregate=Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8f93f39c11345f89a3a72f5656398aa864077daaaacad0a5f3c3cd2f2ba83851d395067a9db6b2033f50107bf3a36cf0114209c5f15888da506395d7de18ca3ff204d36dd4d012a0ee827e99e47b154c1dd6260008cfd0f8fc6a2a1f1ecddbb5}}, selection_proof=SszByteVector{0xaaaedcd09ab741d6521af325dcefc019a1e8e917bc60bcf6f8318697eeafe5274330819f1a7781de1e264f2584c6404812776a54bb0f19427a3da6d0c6ae07947b3cba40241623c10af19b0f19e6a0e4e2ff34c141651c496de97f3a444076d1}}, signature=SszByteVector{0xaecf3fe0854d8977335b26b254ec0cffd96dfe2a3fef7b882dc5cbfa8ab855e6c04894074ab2d15687dd665d98f84489116c01f33157bf0859337b441b481fc5d808fc124639f9dee434f4cb0b263988d49998d494cc7c870ff9c9aa0f1c2b25}}], hashTreeRoot=Suppliers.memoize(tech.pegasys.teku.spec.datastructures.attestation.ValidateableAttestation$$Lambda$2412/0x0000000800916908@53760002), gossiped=false, producedLocally=true, isValidIndexedAttestation=true, indexedAttestation=Optional[IndexedAttestation{attesting_indices=SszList{size=2: 3, 12}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8f93f39c11345f89a3a72f5656398aa864077daaaacad0a5f3c3cd2f2ba83851d395067a9db6b2033f50107bf3a36cf0114209c5f15888da506395d7de18ca3ff204d36dd4d012a0ee827e99e47b154c1dd6260008cfd0f8fc6a2a1f1ecddbb5}}], committeeShufflingSeed=Optional[0xc9117116154b22040e8a5228bb7ac0eb67968e5ad97f598649806f0c9c9eb3d7], receivedSubnetId=OptionalInt.empty} ``` later ``` 2022-09-29 18:48:03.015 INFO - Processing attestation Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8f93f39c11345f89a3a72f5656398aa864077daaaacad0a5f3c3cd2f2ba83851d395067a9db6b2033f50107bf3a36cf0114209c5f15888da506395d7de18ca3ff204d36dd4d012a0ee827e99e47b154c1dd6260008cfd0f8fc6a2a1f1ecddbb5}} 2022-09-29 18:48:03.015 INFO - Setting flag 3 for index 3 from attestation Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8f93f39c11345f89a3a72f5656398aa864077daaaacad0a5f3c3cd2f2ba83851d395067a9db6b2033f50107bf3a36cf0114209c5f15888da506395d7de18ca3ff204d36dd4d012a0ee827e99e47b154c1dd6260008cfd0f8fc6a2a1f1ecddbb5}} 2022-09-29 18:48:03.015 INFO - Processing attestation Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8f93f39c11345f89a3a72f5656398aa864077daaaacad0a5f3c3cd2f2ba83851d395067a9db6b2033f50107bf3a36cf0114209c5f15888da506395d7de18ca3ff204d36dd4d012a0ee827e99e47b154c1dd6260008cfd0f8fc6a2a1f1ecddbb5}} 2022-09-29 18:48:03.015 INFO - Setting flag 3 for index 12 from attestation Attestation{aggregation_bits=SszBitlist{size=2, 11}, data=AttestationData{slot=95, index=0, beacon_block_root=0x3018bdffaf4dd0274ee876153152005866520e143b670aff30fe80746b4a791b, source=Checkpoint{epoch=0, root=0x0000000000000000000000000000000000000000000000000000000000000000}, target=Checkpoint{epoch=2, root=0xc97c30a280902b88cb40a4dcda8e5a56efcf1b62ba679fcfebdf11e3fb706125}}, signature=SszByteVector{0x8f93f39c11345f89a3a72f5656398aa864077daaaacad0a5f3c3cd2f2ba83851d395067a9db6b2033f50107bf3a36cf0114209c5f15888da506395d7de18ca3ff204d36dd4d012a0ee827e99e47b154c1dd6260008cfd0f8fc6a2a1f1ecddbb5}} ``` **bn-defe**: nothing interesting **Summary**: Single attestations was not gossiped with error reason "no peers were available on the required gossip topic". Aggregate attestion was produced and was later included in block when the same vc was chosen as next block producer. I should find the reason why there were no peers on this topic, why gossip was not replayed later.
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Dmitry S.
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Eth2 to Eth1 Validator's withdrawal design [WIP]

Currently Ethereum 2 supports deposits with the only option, deposits from Ethereum 1 and there are no options for validator's stack or its part to be withdrawn. We want to add an option for Ethereum 1 withdrawals following validator exit as the simplest approach for validator owners to get their deposit back with rewards. No option for partial withdrawal is suggested due to higher complexity and lower safety of possible solutions and minor losses on reentry which should take about a day. Our highest priority is to make deposit-withdrawal processes handled with maximum level of autonomy and separation of validator and funder's roles to make possible creation of shared owned validators. Concept of Ethereum shared stacking pool is created according to the specification and currently in testing. Withdrawal implementation requires a set of changes in both ETH2 BeaconChain and ETH1. Contents: 1. Changes in BeaconChain   1.1 Withdrawal credentials for Eth1 withdrawal     1.1.1 Message for changing withdrawal credentials   1.2 Withdrawals   1.3 Withdrawal processing

9/7/2021
Using total difficulty threshold for hardfork anchor: what could go wrong?

[by TXRX Team, Dmitriy Shmatko and Mikhail Kalinin(link), evaluation code is here] In the upcoming Merge Fork which encloses the current PoW chain into the Beacon chain as an Execution Layer, total difficulty was chosen as a point of transition instead of a block number (see Terminal total difficulty vs block number). This approach negotiates the risk of forking a wrong chain backed by minor hash-power but could lead to other risks during transition. In this post we are going to measure these risks and propose changes to fork schema if any is required to decrease the possibility of unforeseen transition flow. Happy flow It's expected that merge client settings will be known in a month before merge happens, so client developers could update their software and validator owners could update their nodes. At some announced epoch number, say, MERGE_FORK_EPOCH the action begins: Beacon chain nodes calculates votes in the last voting period to get some major-backed Eth1Data with block_hash reference to the block in the Mainnet. The corresponding block is called anchor block and becomes a point from which merge total_difficulty on PoW chain side is calculated with the following formula (see spec): def compute_transition_total_difficulty(anchor_pow_block: PowBlock) -> uint256: seconds_per_voting_period = EPOCHS_PER_ETH1_VOTING_PERIOD * SLOTS_PER_EPOCH * SECONDS_PER_SLOT pow_blocks_per_voting_period = seconds_per_voting_period // SECONDS_PER_ETH1_BLOCK

8/16/2021
Purging BeaconState ever-growing Lists

In our approach for providing Validator withdrawal feature we use BeaconState List to store withdrawal receipts from processed requests and automatical withdrawal tasks. Such method assumes data is growing with the time and nothing limits its size. The obvious downside of it is growing size of BeaconState, when every non-light client needs to keep old Withdrawals in state. We propose to purge old Wihdrawals up to client settings, so some clients could store all historical Withdrawals and others could be ok with storing only latest few thousands. Also similar approach could be applied not only for Withdrawals but for other growing parts of state. Accumulators Accumulators are already proposed solution for growing state data. It works in following manner: we have circle buffer for items, for, say, 16384 entities. And we have list for old buffer roots. So, this list grows with time but 16384 times slower in this example. There are several downsides we see in accumulators and want to solve it with purging approach: Old items are still needed by some clients. There should be a mechanism to sync them, there should be a mechanism for clients to request old item which is more than buffer size older. Buffer size is part of a specification. Every client should follow it and cannot have its custom history settings. Accumulators still grows with time. It could be not an issue at the launch, but with grown usage it could become an issue to.

6/7/2021
Issue: Add operation for withdrawal credentials change operation

What? New operation and signed message is proposed for Eth2, BLSSetWithdrawal, which could permanently change withdrawal_credentials: BLSSetWithdrawal class BLSSetWithdrawal(Container): bls_withdrawal_pubkey: Bytes32 # Reveal of withdrawal public key withdrawal_credentials: Bytes32 # New withdrawal credentials, shouldn't start with BLS_WITHDRAWAL_PREFIX (0x00) validator_index: ValidatorIndex And SignedBLSSetWithdrawal message:

2/24/2021
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