This issue tracks the tasks for implementing the Gloas fork in Prysm. Expect changes to this issue and the checklists as work evolves. Also changes are expected after some recent proposed changes in the specs will get merged (e.g. ethereum/consensus-specs#4807 & ethereum/consensus-specs#4788)

EIP-7732: execution Payload-Block Separation

Beacon Chain

Custom Types

• BuilderIndex SSZ type (#16169)

Constants, Preset & Configuration

• Domain types (DOMAIN_BEACON_BUILDER, DOMAIN_PTC_ATTESTER)
• Misc constants (BUILDER_PAYMENT_THRESHOLD_NUMERATOR, BUILDER_PAYMENT_THRESHOLD_DENOMINATOR)
• Withdrawal prefix (BUILDER_WITHDRAWAL_PREFIX)
• Preset values (PTC_SIZE, MAX_PAYLOAD_ATTESTATIONS, BUILDER_PENDING_WITHDRAWALS_LIMIT)

Containers

• Protobuf definitions: #15601

New Containers

• BuilderPendingPayment
• BuilderPendingWithdrawal
• PayloadAttestationData
• PayloadAttestation
• PayloadAttestationMessage
• IndexedPayloadAttestation
• ExecutionPayloadBid
• SignedExecutionPayloadBid
• ExecutionPayloadEnvelope
• SignedExecutionPayloadEnvelope

Modified Containers

• BeaconBlockBody (#15618 - In Progress)
• BeaconState (#15611, #16164 - In Progress)

Helper Functions

Predicates

• New is_builder_withdrawal_credential
• New has_builder_withdrawal_credential
• Modified has_compounding_withdrawal_credential
• New is_attestation_same_slot
• New is_valid_indexed_payload_attestation
• New is_parent_block_full

Misc

• Modified get_pending_balance_to_withdraw
• New compute_balance_weighted_selection
• New compute_balance_weighted_acceptance
• Modified compute_proposer_indices

Beacon State Accessors

• Modified get_next_sync_committee_indices
• Modified get_attestation_participation_flag_indices
• New get_ptc
• New get_indexed_payload_attestation
• New get_builder_payment_quorum_threshold

State Transition Function

Process Slot

• Modified process_slot (#15730) - In Progress (Draft)

Epoch Processing

• Modified process_epoch
• New process_builder_pending_payments (#15655) - In Progress (Draft)

Block Processing - Withdrawals

• New is_builder_payment_withdrawable
• New get_builder_withdrawable_balance
• New get_builder_withdrawals
• Modified get_expected_withdrawals
• New update_payload_expected_withdrawals
• New update_builder_pending_withdrawals
• Modified process_withdrawals

Block Processing - Execution Payload Bid

• New verify_execution_payload_bid_signature
• New process_execution_payload_bid (#15638) - In Progress

Block Processing - Operations

• Modified process_operations
• Modified process_attestation (#15736) - In Progress (Draft)
• New process_payload_attestation (#15650) - In Progress (Draft)
• Modified process_proposer_slashing

Execution Payload Processing

• New verify_execution_payload_envelope_signature
• New process_execution_payload (#15656) - In Progress (Draft)

Fork Choice

Custom Types & Constants

• PayloadStatus type
• Constants (PAYLOAD_TIMELY_THRESHOLD, PAYLOAD_STATUS_PENDING, PAYLOAD_STATUS_EMPTY, PAYLOAD_STATUS_FULL)

Containers

• New ForkChoiceNode
• Modified LatestMessage
• Modified Store (added execution_payload_states, ptc_vote)

Functions

• Modified update_latest_messages
• Modified get_forkchoice_store
• New notify_ptc_messages
• New is_payload_timely
• New get_parent_payload_status
• New is_parent_node_full
• Modified get_ancestor
• Modified get_checkpoint_block
• New is_supporting_vote
• New should_extend_payload
• New get_payload_status_tiebreaker
• Modified get_weight
• New get_node_children
• Modified get_head

Fork-choice Helpers

• Modified get_attestation_due_ms
• Modified get_aggregate_due_ms
• Modified get_sync_message_due_ms
• Modified get_contribution_due_ms
• New get_payload_attestation_due_ms

Fork-choice Handlers

• Modified on_block
• New on_execution_payload
• New on_payload_attestation_message
• Modified validate_on_attestation

Validator

Time Parameters

• Time parameters (ATTESTATION_DUE_BPS_GLOAS, AGGREGATE_DUE_BPS_GLOAS, SYNC_MESSAGE_DUE_BPS_GLOAS, CONTRIBUTION_DUE_BPS_GLOAS, PAYLOAD_ATTESTATION_DUE_BPS)

Validator Assignment

• Payload timeliness committee (get_ptc_assignment)
• PTC lookahead

Beacon Chain Responsibilities

• Attestation (new data.index usage for payload status)
• Sync committee participations deadline change
• Block proposal
  • Constructing signed_execution_payload_bid
  • Constructing payload_attestations
• Blob sidecars - Proposers no longer broadcast DataColumnSidecar objects
• Payload timeliness attestation
  • Constructing a payload attestation

Modified Functions

• Modified prepare_execution_payload

Data Column Sidecars

• Modified get_data_column_sidecars_from_column_sidecar

P2P Interface

Helper Functions

• Modified compute_fork_version

Configuration

• MAX_REQUEST_PAYLOADS

Containers

• Modified DataColumnSidecar (removed signed_block_header, kzg_commitments_inclusion_proof; added slot, beacon_block_root)

Helpers

• Modified verify_data_column_sidecar

Gossip Topics

• beacon_aggregate_and_proof validation changes
• beacon_block validation changes
• New execution_payload topic
• New payload_attestation_message topic
• New execution_payload_bid topic
• data_column_sidecar_{subnet_id} validation changes
• beacon_attestation_{subnet_id} validation changes

Req/Resp

• BeaconBlocksByRange v2 (add GLOAS_FORK_VERSION)
• BeaconBlocksByRoot v2 (add GLOAS_FORK_VERSION)
• New ExecutionPayloadEnvelopesByRange v1
• New ExecutionPayloadEnvelopesByRoot v1

Builder

Becoming a Builder

• Builder withdrawal credentials (BUILDER_WITHDRAWAL_PREFIX)
• Submit deposit
• Process deposit (incl. builder index assignment)
• Activation

Builder Activities

• Constructing SignedExecutionPayloadBid
• Constructing DataColumnSidecars
  • Modified get_data_column_sidecars
  • Modified get_data_column_sidecars_from_block
• Constructing SignedExecutionPayloadEnvelope
• Honest payload withheld messages

Fork

• GLOAS_FORK_VERSION
• GLOAS_FORK_EPOCH
• upgrade_to_gloas state transition

---

Related PRs

PR	Description	Status
#15601	Gloas protobuf definitions with spec tests	Merged
#15611	Gloas beacon state package	Merged
#15618	Gloas consensus type block package	Merged
#16169	BuilderIndex SSZ type	Merged
#16164	Builders registry + state fields	Open
#15736	Process attestation	Draft
#15730	Process slot	Draft
#15656	Process execution payload envelope	Draft
#15655	Process pending payment	Draft
#15650	Process payload attestation	Draft
#15638	Execution payload header processing	Open