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Hsiao-Wei Wang 2024-05-07 20:26:56 +08:00
parent 950136c50d
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specs/_features/eip7594/das-core.md
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@ -106,19 +106,18 @@ def get_custody_columns(node_id: NodeID, custody_subnet_count: uint64) -> Sequen
assert custody_subnet_count <= DATA_COLUMN_SIDECAR_SUBNET_COUNT
subnet_ids: List[uint64] = []
i = uint256(node_id)
current_id = uint256(node_id)
while len(subnet_ids) < custody_subnet_count:
# Overflow prevention
if i == UINT256_MAX:
i = NodeID(0)
subnet_id = (
bytes_to_uint64(hash(uint_to_bytes(uint256(i)))[0:8])
bytes_to_uint64(hash(uint_to_bytes(uint256(current_id)))[0:8])
% DATA_COLUMN_SIDECAR_SUBNET_COUNT
)
if subnet_id not in subnet_ids:
subnet_ids.append(subnet_id)
i += 1
if current_id == UINT256_MAX:
# Overflow prevention
current_id = NodeID(0)
current_id += 1
assert len(subnet_ids) == len(set(subnet_ids))