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add: basic validator custody #6929

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Merged
tersec merged 3 commits into from
Feb 17, 2025
Merged

add: basic validator custody #6929

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782031d
add: basic validator custody
agnxsh Feb 16, 2025
a295568
address review comments
agnxsh Feb 17, 2025
cb4d787
renaming to snake case
agnxsh Feb 17, 2025
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10 changes: 9 additions & 1 deletion beacon_chain/spec/datatypes/fulu.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -59,11 +59,19 @@ const
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.10/specs/fulu/p2p-interface.md#configuration
DATA_COLUMN_SIDECAR_SUBNET_COUNT* = 128

# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.10/specs/fulu/das-core.md#custody-setting
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-beta.2/specs/fulu/das-core.md#custody-setting
SAMPLES_PER_SLOT* = 8
CUSTODY_REQUIREMENT* = 4
NUMBER_OF_CUSTODY_GROUPS* = 128

# Minimum number of custody groups an honest node with
# validators attached custodies and serves samples from
VALIDATOR_CUSTODY_REQUIREMENT* = 8
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# Balance increment corresponding to one additional group to custody
# 2**5 * 10**9 (= 32,000,000,000) Gwei
BALANCE_PER_ADDITIONAL_CUSTODY_GROUP*: uint64 = 32000000000'u64

# Number of columns in the network per custody group
COLUMNS_PER_GROUP* = NUMBER_OF_COLUMNS div NUMBER_OF_CUSTODY_GROUPS

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10 changes: 10 additions & 0 deletions beacon_chain/spec/peerdas_helpers.nim
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Expand Up @@ -342,3 +342,13 @@ proc verify_data_column_sidecar_kzg_proofs*(sidecar: DataColumnSidecar):
return err("DataColumnSidecar: validation failed")

ok()

# https://github.com/ethereum/consensus-specs/blob/v1.5.0-beta.2/specs/fulu/das-core.md#validator-custody
func get_validators_custody_requirement*(state: fulu.BeaconState,
validator_indices: openArray[ValidatorIndex]):
uint64 =
var total_node_balance: Gwei
for index in validator_indices:
total_node_balance += state.balances[index]
let count = total_node_balance div BALANCE_PER_ADDITIONAL_CUSTODY_GROUP
min(max(count.uint64, VALIDATOR_CUSTODY_REQUIREMENT.uint64), NUMBER_OF_CUSTODY_GROUPS.uint64)