Block Structure

Comparison of TL-B Schemas in TON and Tycho

Tycho maintains compatibility with the TON ecosystem at the cell and TVM levels, but introduces several targeted changes to the block format and network configuration parameters.

These modifications are designed to make the consensus and collator pipeline more efficient. In particular, Tycho provides:

• higher-precision timestamps,

• additional metadata about message queue processing progress.

The practical implication is important:

A parser that strictly expects the canonical TON schemas from block.tlb will not correctly decode a Tycho block.

Tycho changes constructors and adds new fields, therefore blocks must be parsed using Tycho TL-B schemas and a parser that explicitly supports them.

---

TL-B Schema Differences

BlockInfo changes

Tycho adds millisecond precision to the block generation time.

-block_info#9bc7a987 ... shard:ShardIdent gen_utime:uint32 start_lt:uint64 end_lt:uint64 ... = BlockInfo;
+block_info_tycho#9bc7a988 ... shard:ShardIdent gen_utime:uint32 gen_utime_ms:uint16 start_lt:uint64 end_lt:uint64 ... = BlockInfo;

---

Block changes

Tycho replaces the Block constructor and introduces a separate structure describing outgoing message queue updates.

-block#11ef55aa global_id:int32
+block_tycho#11ef55bb global_id:int32
   info:^BlockInfo value_flow:^ValueFlow
+  ^[
   state_update:^(MERKLE_UPDATE ShardState)
+  out_msg_queue_updates:OutMsgQueueUpdates
+  ]
   extra:^BlockExtra = Block;

+out_msg_queue_updates#1 diff_hash:bits256 tail_len:uint32 = OutMsgQueueUpdates;

---

ShardDescr changes

Tycho modifies the constructor and extends fields related to message processing progress tracking.

-shard_descr#b seq_no:uint32 reg_mc_seqno:uint32
+shard_descr_tycho#a seq_no:uint32 reg_mc_seqno:uint32
   start_lt:uint64 end_lt:uint64
   root_hash:bits256 file_hash:bits256
   before_split:Bool before_merge:Bool
   want_split:Bool want_merge:Bool
-  nx_cc_updated:Bool flags:(## 3) { flags = 0 }
-  next_catchain_seqno:uint32 next_validator_shard:uint64
+  nx_cc_updated:Bool top_sc_block_updated:Bool flags:(## 2) { flags = 0 }
+  next_catchain_seqno:uint32 ext_processed_to_anchor_id:uint32
   min_ref_mc_seqno:uint32 gen_utime:uint32
   ...
   = ShardDescr;

---

ShardState changes

Tycho updates the ShardStateUnsplit constructor and replaces the outgoing message queue structure with a detailed processing progress structure. Tycho also adds millisecond-level timestamps inside the shard state.

-shard_state#9023afe2 global_id:int32
+shard_state_tycho#9023aeee global_id:int32
   shard_id:ShardIdent
   seq_no:uint32 vert_seq_no:#
-  gen_utime:uint32 gen_lt:uint64
+  gen_utime:uint32 gen_utime_ms:uint16 gen_lt:uint64
   min_ref_mc_seqno:uint32
-  out_msg_queue_info:^OutMsgQueueInfo
+  processed_upto:^ProcessedUptoInfo
   ...
   = ShardStateUnsplit;

+processed_upto_info#00
+  partitions:(HashmapE 16 ProcessedUptoPartition)
+  msgs_exec_params:(Maybe ^MsgsExecutionParams)
+  = ProcessedUptoInfo;
+
+processedUptoPartition#00
+  externals:ExternalsProcessedUpto
+  internals:InternalsProcessedUpto
+  = ProcessedUptoPartition;
+
+externalsProcessedUpto#00
+  processed_to_anchor_id:uint32
+  processed_to_msgs_offset:uint64
+  ranges:(HashmapE 32 ExternalsRange)
+  = ExternalsProcessedUpto;
+
+externalsRange#00
+  from_anchor_id:uint32
+  from_msgs_offset:uint64
+  to_anchor_id:uint32
+  to_msgs_offset:uint64
+  chain_time:uint64
+  skip_offset:uint32
+  processed_offset:uint32
+  = ExternalsRange;
+
+internalsProcessedUpto#00
+  processed_to:(HashmapE 96 ProcessedUpto)
+  ranges:(HashmapE 32 InternalsRange)
+  = InternalsProcessedUpto;
+
+internalsRange#00
+  skip_offset:uint32
+  processed_offset:uint32
+  shards:(HashmapE 96 ShardRange)
+  = InternalsRange;
+
+shardRange#00 from:uint64 to:uint64 = ShardRange;

---

McStateExtra and consensus data changes

Tycho updates the masterchain_state_extra . The flags range is extended and an optional consensus_info field appears:

 masterchain_state_extra#cc26
   shard_hashes:ShardHashes
   config:ConfigParams
-  ^[ flags:(## 16) { flags <= 1 }
+  ^[ flags:(## 16) { flags <= 4 }
      validator_info:ValidatorInfo
      prev_blocks:OldMcBlocksInfo
      after_key_block:Bool
      last_key_block:(Maybe ExtBlkRef)
-     block_create_stats:(flags . 0)?BlockCreateStats ]
+     block_create_stats:(flags . 0)?BlockCreateStats
+     consensus_info:(flags . 2)?ConsensusInfo ]
   global_balance:CurrencyCollection
 = McStateExtra;

+consensus_info#_
+  vset_switch_round:uint32
+  prev_vset_switch_round:uint32
+  genesis_info:GenesisInfo
+  prev_shuffle_mc_validators:Bool
+  = ConsensusInfo;
+
+genesis_info#_
+  start_round:uint32
+  genesis_millis:uint64
+  = GenesisInfo;

---

CatchainConfig data changes

Tycho change of ConfigParam 28 change. Instead of CatchainConfig, CollationConfig is introduced with the collation_config_tycho and collation_config_tycho_v2 schemas.

-_ CatchainConfig = ConfigParam 28;
+_ CollationConfig = ConfigParam 28;

+collation_config_tycho#a6
+  shuffle_mc_validators:Bool
+  mc_block_min_interval_ms:uint32
+  empty_sc_block_interval_ms:uint32
+  max_uncommitted_chain_length:uint8
+  wu_used_to_import_next_anchor:uint64
+  msgs_exec_params:MsgsExecutionParams
+  work_units_params:WorkUnitsParams
+  = CollationConfig;
+
+collation_config_tycho_v2#a7
+  shuffle_mc_validators:Bool
+  mc_block_min_interval_ms:uint32
+  mc_block_max_interval_ms:uint32
+  empty_sc_block_interval_ms:uint32
+  max_uncommitted_chain_length:uint8
+  wu_used_to_import_next_anchor:uint64
+  msgs_exec_params:MsgsExecutionParams
+  work_units_params:WorkUnitsParams
+  = CollationConfig;
+
+msgs_execution_params_tycho#00
+  buffer_limit:uint32
+  group_limit:uint16
+  group_vert_size:uint16
+  externals_expire_timeout:uint16
+  open_ranges_limit:uint16
+  par_0_int_msgs_count_limit:uint32
+  par_0_ext_msgs_count_limit:uint32
+  group_slots_fractions:(HashmapE 16 uint8)
+  = MsgsExecutionParams;
+
+msgs_execution_params_tycho_v2#01
+  buffer_limit:uint32
+  group_limit:uint16
+  group_vert_size:uint16
+  externals_expire_timeout:uint16
+  open_ranges_limit:uint16
+  par_0_int_msgs_count_limit:uint32
+  par_0_ext_msgs_count_limit:uint32
+  group_slots_fractions:(HashmapE 16 uint8)
+  range_messages_limit:uint32
+  = MsgsExecutionParams;
+
+work_units_params_tycho#00
+  prepare:WorkUnitParamsPrepare
+  execute:WorkUnitParamsExecute
+  finalize:WorkUnitParamsFinalize
+  = WorkUnitsParams;
+
+work_units_params_prepare_tycho#00
+  fixed:uint32
+  msgs_stats:uint16
+  remaning_msgs_stats:uint16
+  read_ext_msgs:uint16
+  read_int_msgs:uint16
+  read_new_msgs:uint16
+  add_to_msg_groups:uint16
+  = WorkUnitsParamsPrepare;
+
+work_units_params_execute_tycho#00
+  prepare:uint32
+  execute:uint16
+  execute_err:uint16
+  execute_delimiter:uint32
+  serialize_enqueue:uint16
+  serialize_dequeue:uint16
+  insert_new_msgs:uint16
+  subgroup_size:uint16
+  = WorkUnitsParamsExecute;
+
+work_units_params_finalize_tycho#00
+  build_transactions:uint16
+  build_accounts:uint16
+  build_in_msg:uint16
+  build_out_msg:uint16
+  serialize_min:uint32
+  serialize_accounts:uint16
+  serialize_msg:uint16
+  state_update_min:uint32
+  state_update_accounts:uint16
+  state_update_msg:uint16
+  create_diff:uint16
+  serialize_diff:uint16
+  apply_diff:uint16
+  diff_tail_len:uint16
+  = WorkUnitsParamsFinalize;

---

ConsensusConfig data changes

Tycho change of ConfigParam 29 change. The consensus_config_tycho schema is used for ConsensusConfig.

+consensus_config_tycho#d8
+  clock_skew_millis:uint16 { clock_skew_millis != 0 }
+  payload_batch_bytes:uint32 { payload_batch_bytes != 0 }
+  commit_history_rounds:uint8 { commit_history_rounds != 0 }
+  deduplicate_rounds:uint16
+  max_consensus_lag_rounds:uint16 { max_consensus_lag_rounds != 0 }
+  payload_buffer_bytes:uint32 { payload_buffer_bytes != 0 }
+  broadcast_retry_millis:uint8 { broadcast_retry_millis != 0 }
+  download_retry_millis:uint8 { download_retry_millis != 0 }
+  download_peers:uint8 { download_peers != 0 }
+  min_sign_attempts:uint8 { min_sign_attempts != 0 }
+  download_peer_queries:uint8 { download_peer_queries != 0 }
+  sync_support_rounds:uint16 { sync_support_rounds != 0 }
+  = ConsensusConfig;

 _ ConsensusConfig = ConfigParam 29;

-consensus_config#d6 round_candidates:# { round_candidates >= 1 }
-  next_candidate_delay_ms:uint32 consensus_timeout_ms:uint32
-  fast_attempts:uint32 attempt_duration:uint32 catchain_max_deps:uint32
-  max_block_bytes:uint32 max_collated_bytes:uint32 = ConsensusConfig;
-
-consensus_config_new#d7 flags:(## 7) { flags = 0 } new_catchain_ids:Bool
-  round_candidates:(## 8) { round_candidates >= 1 }
-  next_candidate_delay_ms:uint32 consensus_timeout_ms:uint32
-  fast_attempts:uint32 attempt_duration:uint32 catchain_max_deps:uint32
-  max_block_bytes:uint32 max_collated_bytes:uint32 = ConsensusConfig;
-
-consensus_config_v3#d8 flags:(## 7) { flags = 0 } new_catchain_ids:Bool
-  round_candidates:(## 8) { round_candidates >= 1 }
-  next_candidate_delay_ms:uint32 consensus_timeout_ms:uint32
-  fast_attempts:uint32 attempt_duration:uint32 catchain_max_deps:uint32
-  max_block_bytes:uint32 max_collated_bytes:uint32
-  proto_version:uint16 = ConsensusConfig;
-
-consensus_config_v4#d9 flags:(## 7) { flags = 0 } new_catchain_ids:Bool
-  round_candidates:(## 8) { round_candidates >= 1 }
-  next_candidate_delay_ms:uint32 consensus_timeout_ms:uint32
-  fast_attempts:uint32 attempt_duration:uint32 catchain_max_deps:uint32
-  max_block_bytes:uint32 max_collated_bytes:uint32
-  proto_version:uint16 catchain_max_blocks_coeff:uint32 = ConsensusConfig;

---

block.tlb full diff

 master_info$_ master:ExtBlkRef = BlkMasterInfo;

-shard_state#9023afe2 global_id:int32
+shard_state_tycho#9023aeee global_id:int32
   shard_id:ShardIdent
   seq_no:uint32 vert_seq_no:#
-  gen_utime:uint32 gen_lt:uint64
+  gen_utime:uint32 gen_utime_ms:uint16 gen_lt:uint64
   min_ref_mc_seqno:uint32
-  out_msg_queue_info:^OutMsgQueueInfo
+  processed_upto:^ProcessedUptoInfo
   before_split:(## 1)
   accounts:^ShardAccounts
   ^[ overload_history:uint64 underload_history:uint64
@@ -442,10 +442,49 @@ shard_state#9023afe2 global_id:int32
 _ ShardStateUnsplit = ShardState;
 split_state#5f327da5 left:^ShardStateUnsplit right:^ShardStateUnsplit = ShardState;

+processed_upto_info#00
+  partitions:(HashmapE 16 ProcessedUptoPartition)
+  msgs_exec_params:(Maybe ^MsgsExecutionParams)
+  = ProcessedUptoInfo;
+
+processedUptoPartition#00
+  externals:ExternalsProcessedUpto
+  internals:InternalsProcessedUpto
+  = ProcessedUptoPartition;
+
+externalsProcessedUpto#00
+  processed_to_anchor_id:uint32
+  processed_to_msgs_offset:uint64
+  ranges:(HashmapE 32 ExternalsRange)
+  = ExternalsProcessedUpto;
+
+externalsRange#00
+  from_anchor_id:uint32
+  from_msgs_offset:uint64
+  to_anchor_id:uint32
+  to_msgs_offset:uint64
+  chain_time:uint64
+  skip_offset:uint32
+  processed_offset:uint32
+  = ExternalsRange;
+
+internalsProcessedUpto#00
+  processed_to:(HashmapE 96 ProcessedUpto)
+  ranges:(HashmapE 32 InternalsRange)
+  = InternalsProcessedUpto;
+
+internalsRange#00
+  skip_offset:uint32
+  processed_offset:uint32
+  shards:(HashmapE 96 ShardRange)
+  = InternalsRange;
+
+shardRange#00 from:uint64 to:uint64 = ShardRange;
+
 shared_lib_descr$00 lib:^Cell publishers:(Hashmap 256 True)
   = LibDescr;

-block_info#9bc7a987 version:uint32
+block_info_tycho#9bc7a988 version:uint32
   not_master:(## 1)
   after_merge:(## 1) before_split:(## 1)
   after_split:(## 1)
@@ -455,6 +494,7 @@ block_info#9bc7a987 version:uint32
   seq_no:# vert_seq_no:# { vert_seq_no >= vert_seqno_incr }
   { prev_seq_no:# } { ~prev_seq_no + 1 = seq_no }
   shard:ShardIdent gen_utime:uint32
+  gen_utime_ms:uint16
   start_lt:uint64 end_lt:uint64
   gen_validator_list_hash_short:uint32
   gen_catchain_seqno:uint32
@@ -469,12 +509,17 @@ block_info#9bc7a987 version:uint32
 prev_blk_info$_ prev:ExtBlkRef = BlkPrevInfo 0;
 prev_blks_info$_ prev1:^ExtBlkRef prev2:^ExtBlkRef = BlkPrevInfo 1;

-block#11ef55aa global_id:int32
+block_tycho#11ef55bb global_id:int32
   info:^BlockInfo value_flow:^ValueFlow
+  ^[
   state_update:^(MERKLE_UPDATE ShardState)
+  out_msg_queue_updates:OutMsgQueueUpdates
+  ]
   extra:^BlockExtra = Block;

-block_extra in_msg_descr:^InMsgDescr
+out_msg_queue_updates#1 diff_hash:bits256 tail_len:uint32 = OutMsgQueueUpdates;
+
+block_extra_tycho#4a33f6fc in_msg_descr:^InMsgDescr
   out_msg_descr:^OutMsgDescr
   account_blocks:^ShardAccountBlocks
   rand_seed:bits256
@@ -516,25 +561,13 @@ fsm_none$0 = FutureSplitMerge;
 fsm_split$10 split_utime:uint32 interval:uint32 = FutureSplitMerge;
 fsm_merge$11 merge_utime:uint32 interval:uint32 = FutureSplitMerge;

-shard_descr#b seq_no:uint32 reg_mc_seqno:uint32
+shard_descr_tycho#a seq_no:uint32 reg_mc_seqno:uint32
   start_lt:uint64 end_lt:uint64
   root_hash:bits256 file_hash:bits256
   before_split:Bool before_merge:Bool
   want_split:Bool want_merge:Bool
-  nx_cc_updated:Bool flags:(## 3) { flags = 0 }
-  next_catchain_seqno:uint32 next_validator_shard:uint64
-  min_ref_mc_seqno:uint32 gen_utime:uint32
-  split_merge_at:FutureSplitMerge
-  fees_collected:CurrencyCollection
-  funds_created:CurrencyCollection = ShardDescr;
-
-shard_descr_new#a seq_no:uint32 reg_mc_seqno:uint32
-  start_lt:uint64 end_lt:uint64
-  root_hash:bits256 file_hash:bits256
-  before_split:Bool before_merge:Bool
-  want_split:Bool want_merge:Bool
-  nx_cc_updated:Bool flags:(## 3) { flags = 0 }
-  next_catchain_seqno:uint32 next_validator_shard:uint64
+  nx_cc_updated:Bool top_sc_block_updated:Bool flags:(## 2) { flags = 0 }
+  next_catchain_seqno:uint32 ext_processed_to_anchor_id:uint32
   min_ref_mc_seqno:uint32 gen_utime:uint32
   split_merge_at:FutureSplitMerge
   ^[ fees_collected:CurrencyCollection
@@ -577,15 +610,28 @@ block_create_stats_ext#34 counters:(HashmapAugE 256 CreatorStats uint32) = Block
 masterchain_state_extra#cc26
   shard_hashes:ShardHashes
   config:ConfigParams
-  ^[ flags:(## 16) { flags <= 1 }
+  ^[ flags:(## 16) { flags <= 4 }
      validator_info:ValidatorInfo
      prev_blocks:OldMcBlocksInfo
      after_key_block:Bool
      last_key_block:(Maybe ExtBlkRef)
-     block_create_stats:(flags . 0)?BlockCreateStats ]
+     block_create_stats:(flags . 0)?BlockCreateStats
+     consensus_info:(flags . 2)?ConsensusInfo ]
   global_balance:CurrencyCollection
 = McStateExtra;

+consensus_info#_
+  vset_switch_round:uint32
+  prev_vset_switch_round:uint32
+  genesis_info:GenesisInfo
+  prev_shuffle_mc_validators:Bool
+  = ConsensusInfo;
+
+genesis_info#_
+  start_round:uint32
+  genesis_millis:uint64
+  = GenesisInfo;
+
 ed25519_pubkey#8e81278a pubkey:bits256 = SigPubKey;  // 288 bits
 ed25519_signature#5 R:bits256 s:bits256 = CryptoSignatureSimple;  // 516 bits
 _ CryptoSignatureSimple = CryptoSignature;
@@ -747,39 +793,110 @@ config_mc_fwd_prices#_ MsgForwardPrices = ConfigParam 24;
 // used for all other messages
 config_fwd_prices#_ MsgForwardPrices = ConfigParam 25;

-consensus_config#d6 round_candidates:# { round_candidates >= 1 }
-  next_candidate_delay_ms:uint32 consensus_timeout_ms:uint32
-  fast_attempts:uint32 attempt_duration:uint32 catchain_max_deps:uint32
-  max_block_bytes:uint32 max_collated_bytes:uint32 = ConsensusConfig;
-
-consensus_config_new#d7 flags:(## 7) { flags = 0 } new_catchain_ids:Bool
-  round_candidates:(## 8) { round_candidates >= 1 }
-  next_candidate_delay_ms:uint32 consensus_timeout_ms:uint32
-  fast_attempts:uint32 attempt_duration:uint32 catchain_max_deps:uint32
-  max_block_bytes:uint32 max_collated_bytes:uint32 = ConsensusConfig;
-
-consensus_config_v3#d8 flags:(## 7) { flags = 0 } new_catchain_ids:Bool
-  round_candidates:(## 8) { round_candidates >= 1 }
-  next_candidate_delay_ms:uint32 consensus_timeout_ms:uint32
-  fast_attempts:uint32 attempt_duration:uint32 catchain_max_deps:uint32
-  max_block_bytes:uint32 max_collated_bytes:uint32
-  proto_version:uint16 = ConsensusConfig;
-
-consensus_config_v4#d9 flags:(## 7) { flags = 0 } new_catchain_ids:Bool
-  round_candidates:(## 8) { round_candidates >= 1 }
-  next_candidate_delay_ms:uint32 consensus_timeout_ms:uint32
-  fast_attempts:uint32 attempt_duration:uint32 catchain_max_deps:uint32
-  max_block_bytes:uint32 max_collated_bytes:uint32
-  proto_version:uint16 catchain_max_blocks_coeff:uint32 = ConsensusConfig;
-
-_ CatchainConfig = ConfigParam 28;
+collation_config_tycho#a6
+  shuffle_mc_validators:Bool
+  mc_block_min_interval_ms:uint32
+  empty_sc_block_interval_ms:uint32
+  max_uncommitted_chain_length:uint8
+  wu_used_to_import_next_anchor:uint64
+  msgs_exec_params:MsgsExecutionParams
+  work_units_params:WorkUnitsParams
+  = CollationConfig;
+
+collation_config_tycho_v2#a7
+  shuffle_mc_validators:Bool
+  mc_block_min_interval_ms:uint32
+  mc_block_max_interval_ms:uint32
+  empty_sc_block_interval_ms:uint32
+  max_uncommitted_chain_length:uint8
+  wu_used_to_import_next_anchor:uint64
+  msgs_exec_params:MsgsExecutionParams
+  work_units_params:WorkUnitsParams
+  = CollationConfig;
+
+msgs_execution_params_tycho#00
+  buffer_limit:uint32
+  group_limit:uint16
+  group_vert_size:uint16
+  externals_expire_timeout:uint16
+  open_ranges_limit:uint16
+  par_0_int_msgs_count_limit:uint32
+  par_0_ext_msgs_count_limit:uint32
+  group_slots_fractions:(HashmapE 16 uint8)
+  = MsgsExecutionParams;
+
+msgs_execution_params_tycho_v2#01
+  buffer_limit:uint32
+  group_limit:uint16
+  group_vert_size:uint16
@@ -793,6 +917,7 @@ config_fwd_prices#_ MsgForwardPrices = ConfigParam 25;
   par_0_int_msgs_count_limit:uint32
   par_0_ext_msgs_count_limit:uint32
   group_slots_fractions:(HashmapE 16 uint8)
+  range_messages_limit:uint32
   = MsgsExecutionParams;
+
+work_units_params_tycho#00
+  prepare:WorkUnitParamsPrepare
+  execute:WorkUnitParamsExecute
+  finalize:WorkUnitParamsFinalize
+  = WorkUnitsParams;
+
+work_units_params_prepare_tycho#00
+  fixed:uint32
+  msgs_stats:uint16
+  remaning_msgs_stats:uint16
+  read_ext_msgs:uint16
+  read_int_msgs:uint16
+  read_new_msgs:uint16
+  add_to_msg_groups:uint16
+  = WorkUnitsParamsPrepare;
+
+work_units_params_execute_tycho#00
+  prepare:uint32
+  execute:uint16
+  execute_err:uint16
+  execute_delimiter:uint32
+  serialize_enqueue:uint16
+  serialize_dequeue:uint16
+  insert_new_msgs:uint16
+  subgroup_size:uint16
+  = WorkUnitsParamsExecute;
+
+work_units_params_finalize_tycho#00
+  build_transactions:uint16
+  build_accounts:uint16
+  build_in_msg:uint16
+  build_out_msg:uint16
+  serialize_min:uint32
+  serialize_accounts:uint16
+  serialize_msg:uint16
+  state_update_min:uint32
+  state_update_accounts:uint16
+  state_update_msg:uint16
+  create_diff:uint16
+  serialize_diff:uint16
+  apply_diff:uint16
+  diff_tail_len:uint16
+  = WorkUnitsParamsFinalize;
+
+consensus_config_tycho#d8
+  clock_skew_millis:uint16 { clock_skew_millis != 0 }
+  payload_batch_bytes:uint32 { payload_batch_bytes != 0 }
+  commit_history_rounds:uint8 { commit_history_rounds != 0 }
+  deduplicate_rounds:uint16
+  max_consensus_lag_rounds:uint16 { max_consensus_lag_rounds != 0 }
+  payload_buffer_bytes:uint32 { payload_buffer_bytes != 0 }
+  broadcast_retry_millis:uint8 { broadcast_retry_millis != 0 }
+  download_retry_millis:uint8 { download_retry_millis != 0 }
+  download_peers:uint8 { download_peers != 0 }
+  min_sign_attempts:uint8 { min_sign_attempts != 0 }
+  download_peer_queries:uint8 { download_peer_queries != 0 }
+  sync_support_rounds:uint16 { sync_support_rounds != 0 }
+  = ConsensusConfig;
+
+_ CollationConfig = ConfigParam 28;
 _ ConsensusConfig = ConfigParam 29;

 _ fundamental_smc_addr:(HashmapE 256 True) = ConfigParam 31;