[Core Protocol] Block Deviation on Custom L1 Network

[0xAurelou]

Did you check the documentation and specs?

• Yes

Was there anything unclear or missing?

No response

Did you check for duplicate questions?

• Yes

Similar Questions or Issues Found

No response

Please select the type of request

• Bug Report
• Feature Request

Steps to Reproduce

1. Deploy Op Stack on an alternative L1 network with dual block architecture:
   • Fast blocks: 1-second interval, 2M gas limit
   • Slow blocks: 60-second interval, 30M gas limit
2. Monitor the deviation between L1 safe head and L2 safe head using custom monitoring script
3. Calculate total gap as: safe_L1_block - safe_L2_block
4. Observe behavior during sequencer batching cycles

Expected vs. Actual Behaviour

Expected: Block deviation should remain constant or decrease after each batching cycle, maintaining synchronization between L1 and L2.

Actual:

• Deviation follows a sawtooth pattern that increases by +1 block per cycle
• Pattern: 131→132→133 (batching occurs) → drops to 71→72→73
• Next cycle: 72→73→74 (batching) → drops to 72 (should be 71 or lower)
• Each subsequent cycle starts 1 block higher than the previous cycle's minimum
• Deviation grows linearly until it exceeds the sequencer window (21,600 blocks)

Software Versions

• op-node: op-node/v1.13.5
• op-batcher: op-batcher/v1.14.0
• op-proposer: op-proposer/v1.10.1-rc.3
• op-geth: Custom fork "kitchen-op-geth-max" v0.1.0-untagged (commit: b297a528)
  • Based on upstream geth 1.15.11-stable

Operating System

Command used:

lsb_release -a

Output:

Distributor ID: Ubuntu
Description:    Ubuntu 24.04 LTS
Release:        24.04
Codename:       noble

Hardware Resources

• CPU: 8x AMD EPYC 9254 24-Core Processor (KVM)
• RAM: 32GiB (2x 16GiB DIMM)
• Architecture: Virtual machine

Configuration Files, Startup Flags & Environment Variables

Rollup.json

{
  "genesis": {
    "l1": {
      "hash": "0x006c7b997e77e7a16d13679350e9e87784c911b1c626ba05521cb99aa8b91558",
      "number": 27193208
    },
    "l2": {
      "hash": "0x07f5f69c11aa91cab0c52ae871b175c5880bda14f1be528adc642edd31ee2daa",
      "number": 0
    },
    "l2_time": 1752760457,
    "system_config": {
      "batcherAddr": "0x7340e00ad8b04822a90b678f1de95aabd2b4e562",
      "overhead": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "scalar": "0x010000000000000000000000000000000000000000000000000c5fc500000558",
      "gasLimit": 60000000,
      "eip1559Params": "0x0000000000000000",
      "operatorFeeParams": "0x0000000000000000000000000000000000000000000000000000000000000000"
    }
  },
  "block_time": 1,
  "max_sequencer_drift": 3600,
  "seq_window_size": 21600,
  "channel_timeout": 1800,
  "l1_chain_id": 998,
  "l2_chain_id": 4227,
  "regolith_time": 0,
  "canyon_time": 0,
  "delta_time": 0,
  "ecotone_time": 0,
  "fjord_time": 0,
  "granite_time": 0,
  "holocene_time": 0,
  "isthmus_time": 0,
  "batch_inbox_address": "0x00ec4778d637d8e982937b8a4398c27a056774e2",
  "deposit_contract_address": "0x887e6662cd0953ef8d00acf832143972f9509b3b",
  "l1_system_config_address": "0xfe89afad05ba36c57bc85acc1f69516ac0363003",
  "protocol_versions_address": "0xed1780c32afdef0aa1a657f3dc7815456d995a03",
  "chain_op_config": {
    "eip1559Elasticity": 6,
    "eip1559Denominator": 50,
    "eip1559DenominatorCanyon": 250
  }
}

sequencer:

/op-node/bin/op-node \
    --sequencer.l1-confs=2 \
    --l1=http://localhost:4227/main/evm/998 \
    --l1.http-poll-interval=1s \
    --l1.epoch-poll-interval=1s \
    --l1.trustrpc=true \
    --l1.beacon.ignore=true \
    --l1.rpckind=standard \
    # --l2=http://127.0.0.1:8081 \
    --l2=http://127.0.0.1:8551 \
    --l2.jwt-secret=/home/erpc/op-configs/jwt.hex \
    --rollup.config=/home/erpc/op-configs/rollup.json \
    --rpc.addr=0.0.0.0 \
    --rpc.enable-admin \
    --p2p.disable=true \
    --sequencer.enabled \
    --log.level=debug \
    --p2p.no-discovery=true \
    --metrics.enabled \
    --metrics.addr=0.0.0.0 \
    --metrics.port=7301 \
    --fetch-withdrawal-root-from-state \
    --l1.cache-size=0

l2 node:

    kitchen-op-geth-max/build/bin/geth \
    --port 30334 \
    --datadir=/home/erpc/.local/share/reth/4227 \
    --http \
    --http.addr=0.0.0.0 \
    --http.port=8545 \
    --http.api=web3,debug,eth,txpool,net,engine,miner \
    --http.corsdomain="*" \
    --http.vhosts="*" \
    --authrpc.addr=0.0.0.0 \
    --authrpc.port=8551 \
    --authrpc.jwtsecret=/home/erpc/op-configs/jwt.hex \
    --authrpc.vhosts="*" \
    --ws \
    --ws.addr=0.0.0.0 \
    --ws.port=8546 \
    --ws.api=web3,debug,eth,txpool,net,engine,miner \
    --ws.origins="*" \
    --syncmode=full \
    --gcmode=archive \
    --metrics \
    --metrics.addr=0.0.0.0 \
    --metrics.port=6060 \
    --state.scheme=hash \
    --verbosity=3 \
    --rollup.computependingblock=true

batcher:

    /op-batcher/bin/op-batcher \
    --l2-eth-rpc=http://127.0.0.1:8545 \
    --rollup-rpc=http://127.0.0.1:9545 \
    --poll-interval=1s \
    --num-confirmations=1 \
    --resubmission-timeout=10s \
    --rpc.addr=0.0.0.0 \
    --rpc.port=8548 \
    --rpc.enable-admin \
    --l1-eth-rpc=http://localhost:4227/main/evm/998 \
    --private-key=${OP_BATCHER_PRIVATE_KEY} \
    --fee-limit-multiplier=50 \
    --max-pending-tx=1 \
    --data-availability-type=calldata \
    --max-l1-tx-size-bytes=6000 \
    --sub-safety-margin=1 \
    --max-channel-duration=30

proposer:

op-proposer/bin/op-proposer \
    --l1-eth-rpc=http://localhost:4227/main/evm/998 \
    --rollup-rpc=http://127.0.0.1:9545 \
    --game-factory-address=0xbea481f202646554a90ab14c5032bcb22ba2ee52 \
    --private-key=${OP_PROPOSER_PRIVATE_KEY} \
    --poll-interval=6s \
    --rpc.port=8560 \
    --proposal-interval=30s \
    --num-confirmations=1 \
    --allow-non-finalized \
    --game-type=1

Error Messages / Logs

Sequencer log:

Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer action"
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer action schedule changed" t=2025-07-19T16:14:11+0000 wait=-349.869µs ok=false event=sequencer-action
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Built new L2 block" l2_unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 l1_origin=0x939e7658256b5a370c484f2a01aecf598bda10cdb504ca682be5a6ae543c2589:27374824 txs=1 deposits=0 time=1752941651 seal_time=939.153µs build_time=1.433181904s
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=info msg="Sequencer sealed block" payloadID=0x03d5420a14e64883 block=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 parent=0x86b20dc754d7fe4686551e48447edb13418345438ba70b5c6de463a6537771c9:15721 txs=1 time=1752941651
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=info msg="Sequencer inserted block" block=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 parent=0x86b20dc754d7fe4686551e48447edb13418345438ba70b5c6de463a6537771c9:15721
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=info msg="Inserted new L2 unsafe block" hash=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6 number=15722 state_root=0x043d63ba397ab0c0099c9df50e4ac6799cbd86373b37aeb620047fc7ae6ec7ae timestamp=1752941651 parent=0x86b20dc754d7fe4686551e48447edb13418345438ba70b5c6de463a6537771c9 prev_randao=0x0000000000000000000000000000000000000000000000000000000000000000 fee_recipient=0x4200000000000000000000000000000000000011 txs=1 build_time=1.433s insert_time=3.805ms total_time=1.437s mgas=0.048932 mgasps=0.034048731946300405
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Forkchoice update" unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 safe=0xd8475ff947b5a43b7bf7eb5ae63dca122ea6261967a89a8110de8e56b8f662fe:15706 finalized=0xd8475ff947b5a43b7bf7eb5ae63dca122ea6261967a89a8110de8e56b8f662fe:15706
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="CL sync received forkchoice update" unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 safe=0xd8475ff947b5a43b7bf7eb5ae63dca122ea6261967a89a8110de8e56b8f662fe:15706 finalized=0xd8475ff947b5a43b7bf7eb5ae63dca122ea6261967a89a8110de8e56b8f662fe:15706
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer is processing forkchoice update" unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 latest=0x86b20dc754d7fe4686551e48447edb13418345438ba70b5c6de463a6537771c9:15721
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer action schedule changed" t=2025-07-19T16:14:11+0000 wait=-390ns ok=true event=forkchoice-update
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Cross unsafe head updated" cross_unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 local_unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=info msg="Scheduled sequencer action" delta=-94.191µs
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer action"
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=info msg="Started sequencing new block" parent=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 l1Origin=0xc9ed0ab95569ef56d546f2268b99c2115be22a42773e9797ab4ca325b8d995ec:27374825
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="prepared attributes for new block" num=15723 time=1752941652 origin=0xc9ed0ab95569ef56d546f2268b99c2115be22a42773e9797ab4ca325b8d995ec:27374825 origin_time=1752941396 noTxPool=false
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer action schedule changed" t=2025-07-19T16:14:11+0000 wait=-1.100013ms ok=false event=sequencer-action
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Forkchoice update" unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 safe=0xd8475ff947b5a43b7bf7eb5ae63dca122ea6261967a89a8110de8e56b8f662fe:15706 finalized=0xd8475ff947b5a43b7bf7eb5ae63dca122ea6261967a89a8110de8e56b8f662fe:15706
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="CL sync received forkchoice update" unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 safe=0xd8475ff947b5a43b7bf7eb5ae63dca122ea6261967a89a8110de8e56b8f662fe:15706 finalized=0xd8475ff947b5a43b7bf7eb5ae63dca122ea6261967a89a8110de8e56b8f662fe:15706
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer is processing forkchoice update" unsafe=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 latest=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer started building new block" payloadID=0x039f38640c46c1f9 parent=0x04e634182db65251fecf29a05616de989b7b0944d06e8ae17d361354ea676df6:15722 parent_time=1752941651
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="Sequencer action schedule changed" t=2025-07-19T16:14:11+0000 wait=507.246749ms ok=true event=build-started
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=info msg="Scheduled sequencer action" delta=507.234619ms
Jul 19 16:14:11 L1ERPC op-node[33133]: t=2025-07-19T16:14:11+0000 lvl=debug msg="L1 head moved forward" l1_head=0x28c6c27e44394f0a423c40f6f9059797c8b6f0a8917dbe2f719e34d28cb54631:27375085

Batcher:

Jul 19 16:15:09 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:09+0000 lvl=info msg="Created channel" id=2dc405fdb8369368f710ec5d0e68e7d8 l1Head=0x4e7def9c8a747d0f8b843572e0b7d56cb9d77c85e66cbff17fe333e3e694c475:27375143 blocks_pending=13 l1OriginLastSubmittedChannel=0x5ec5b45601742ee8ecc513f78626c02d2cfc3c857f665cfc7797d854a1f09a40:27374868 batch_type=0 compression_algo=zlib target_num_frames=1 max_frame_size=5999 use_blobs=false
Jul 19 16:15:09 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:09+0000 lvl=info msg="Channel closed" id=2dc405fdb8369368f710ec5d0e68e7d8 blocks_pending=0 num_frames=1 input_bytes=1066 output_bytes=1040 oldest_l1_origin=0x09787a1d22482f8e0c5c763ef621f65c140050c0cd7e4697acf769476090b5d5:27374869 l1_origin=0xd11b2ca7b657e9ebfe345988baa8f50937502e2a2f690b6fc658e3bf4a681c63:27374881 oldest_l2=0x0ef2a992a69cc1b1fbb108e4d558d87562bdbcb4a509bdebca2116bc3609078e:15767 latest_l2=0xf837c3fe700e347e6674e01ad86d7a7318a3de842a8e92c7e522c150fc321339:15779 full_reason="channel full: max channel duration reached" compr_ratio=0.975609756097561
Jul 19 16:15:09 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:09+0000 lvl=info msg="Building Calldata transaction candidate" size=1041
Jul 19 16:15:09 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:09+0000 lvl=info msg="Transaction successfully published" service=batcher tx=0x2fbca75b8be19e86a1d2f51a3fde0da7c9176578d3bf6e55bb3f014f9af60c9d nonce=163682 gasTipCap=1000000000 gasFeeCap=3000000000 gasLimit=56460 tx=0x2fbca75b8be19e86a1d2f51a3fde0da7c9176578d3bf6e55bb3f014f9af60c9d
Jul 19 16:15:10 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:10+0000 lvl=info msg="Loading range of multiple blocks into state" start=15780 end=15781
Jul 19 16:15:10 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:10+0000 lvl=info msg="Added L2 block to local state" block=0x26a70e712ee967ddfa460fcaf33aa1895fad963ebe85be8bdb9cd4997055e0b6:15780 tx_count=1 time=1752941709
Jul 19 16:15:10 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:10+0000 lvl=info msg="Added L2 block to local state" block=0x51bc24976cb311bab771111f48e9bd5fb3c3d1bf2e44e0e9688ec04ec9eb1e3d:15781 tx_count=1 time=1752941710
Jul 19 16:15:12 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:12+0000 lvl=info msg="Loading range of multiple blocks into state" start=15782 end=15783
Jul 19 16:15:12 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:12+0000 lvl=info msg="Added L2 block to local state" block=0xe38d9eb60b5f983c2f91cea6f5717b91bc78b5a609c889dbe5b22630398a669c:15782 tx_count=1 time=1752941711
Jul 19 16:15:12 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:12+0000 lvl=info msg="Added L2 block to local state" block=0x2996d1f1c5c994ff57b08402f916f2565f73cfa829cb5ecdd722779c47ee8319:15783 tx_count=1 time=1752941712
Jul 19 16:15:14 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:14+0000 lvl=info msg="Loading range of multiple blocks into state" start=15784 end=15785
Jul 19 16:15:14 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:14+0000 lvl=info msg="Added L2 block to local state" block=0x9884b2141c229e6aa9641c36e1c2800eb739f8a6b66cf006aec18c61331f35b4:15784 tx_count=1 time=1752941713
Jul 19 16:15:14 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:14+0000 lvl=info msg="Added L2 block to local state" block=0xa72f22e4a6bda5fee7e016939e347c93ad9a3beaf308fe9f3960a017f28636a0:15785 tx_count=1 time=1752941714
Jul 19 16:15:15 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:15+0000 lvl=info msg="Added L2 block to local state" block=0xfba1a29b343324add45829e11e9bcd8f3cb3c0463f1ff1e6fa08eceb0c9ef600:15786 tx_count=1 time=1752941715
Jul 19 16:15:16 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:16+0000 lvl=info msg="Added L2 block to local state" block=0xb3f268c4bd654490952d70ce62e5d54d8b4bb194ef540444de34215b93bd4b62:15787 tx_count=1 time=1752941716
Jul 19 16:15:17 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:17+0000 lvl=info msg="Added L2 block to local state" block=0xdfae5de6c012b03721bbaf2196d880b93aaa7876274465131e6950b9b94bd031:15788 tx_count=1 time=1752941717
Jul 19 16:15:19 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:19+0000 lvl=info msg="Loading range of multiple blocks into state" start=15789 end=15790
Jul 19 16:15:19 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:19+0000 lvl=info msg="Added L2 block to local state" block=0xeac89aa683c759ef72a0496ade1d4b90af05d6254d7c65891fd53ba257a56aab:15789 tx_count=1 time=1752941718
Jul 19 16:15:19 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:19+0000 lvl=info msg="Added L2 block to local state" block=0x48609332e972cba2167cfdf7daa4dc432d66620edcf06974c03110b7c3ed84d7:15790 tx_count=1 time=1752941719
Jul 19 16:15:19 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:19+0000 lvl=info msg="Publishing transaction" service=batcher tx=0x2fbca75b8be19e86a1d2f51a3fde0da7c9176578d3bf6e55bb3f014f9af60c9d nonce=163682 gasTipCap=1000000000 gasFeeCap=3000000000 gasLimit=56460
Jul 19 16:15:19 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:19+0000 lvl=info msg="bumping gas price for transaction" service=batcher tx=0x2fbca75b8be19e86a1d2f51a3fde0da7c9176578d3bf6e55bb3f014f9af60c9d nonce=163682 gasTipCap=1000000000 gasFeeCap=3000000000 gasLimit=56460
Jul 19 16:15:21 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:21+0000 lvl=info msg="Transaction confirmed" service=batcher tx=0x2fbca75b8be19e86a1d2f51a3fde0da7c9176578d3bf6e55bb3f014f9af60c9d block=0xa5e219a203892a69ab9d566408964132e98d3975ff07389594c3f59b9b5577f3:27375145 effectiveGasPrice=1100000000
Jul 19 16:15:21 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:21+0000 lvl=info msg="Transaction receipt not found" service=batcher tx=0x3f8125f3f77ccd07256c6d42fdd875ef389764ab238253a31bf1d03f4e9badb5 nonce=163682 gasTipCap=1100000000 gasFeeCap=3300000000 gasLimit=56460 err="context canceled"
Jul 19 16:15:21 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:21+0000 lvl=info msg="Handling receipt" id=f30838ebfa4c848c04ea14393b40413a:0
Jul 19 16:15:21 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:21+0000 lvl=info msg="Transaction confirmed" tx_id=f30838ebfa4c848c04ea14393b40413a:0 tx=0x2fbca75b8be19e86a1d2f51a3fde0da7c9176578d3bf6e55bb3f014f9af60c9d block=0xa5e219a203892a69ab9d566408964132e98d3975ff07389594c3f59b9b5577f3:27375145
Jul 19 16:15:21 L1ERPC op-batcher[4166646]: t=2025-07-19T16:15:21+0000 lvl=info msg="Channel is fully submitted" id=f30838ebfa4c848c04ea14393b40413a min_inclusion_block=27375145 max_inclusion_block=27375145

Proposer:

Jul 19 16:15:57 L1ERPC op-proposer[33131]: t=2025-07-19T16:15:57+0000 lvl=info msg="No proposals found for at least proposal interval, submitting proposal now" proposalInterval=30s
Jul 19 16:15:57 L1ERPC op-proposer[33131]: t=2025-07-19T16:15:57+0000 lvl=info msg="Proposing output root" output=0xda200187763891b135b0891991bce9f153d365fdf7a05c7e1f1dc98710fc975c block=15803
Jul 19 16:15:57 L1ERPC op-proposer[33131]: t=2025-07-19T16:15:57+0000 lvl=info msg="Publishing transaction" service=proposer tx=0x6d9b3c26cd814132d0a13334da62b61dd0144d56adce94d7be7a39d2cded0e7d nonce=584 gasTipCap=1000000000 gasFeeCap=3000000000 gasLimit=385915
Jul 19 16:15:57 L1ERPC op-proposer[33131]: t=2025-07-19T16:15:57+0000 lvl=info msg="Transaction successfully published" service=proposer tx=0x6d9b3c26cd814132d0a13334da62b61dd0144d56adce94d7be7a39d2cded0e7d nonce=584 gasTipCap=1000000000 gasFeeCap=3000000000 gasLimit=385915 tx=0x6d9b3c26cd814132d0a13334da62b61dd0144d56adce94d7be7a39d2cded0e7d
Jul 19 16:16:09 L1ERPC op-proposer[33131]: t=2025-07-19T16:16:09+0000 lvl=info msg="Transaction confirmed" service=proposer tx=0x6d9b3c26cd814132d0a13334da62b61dd0144d56adce94d7be7a39d2cded0e7d block=0x1becfe8dd5190686a10da46101baae4f07e1276f0e4c308b20ad7ce3f1b9c1eb:27375193 effectiveGasPrice=1100000000
Jul 19 16:16:09 L1ERPC op-proposer[33131]: t=2025-07-19T16:16:09+0000 lvl=info msg="Proposer tx successfully published" tx_hash=0x6d9b3c26cd814132d0a13334da62b61dd0144d56adce94d7be7a39d2cded0e7d l1blocknum=27375190 l1blockhash=0x30cb3ab138c4ac42cb9e30998e9d76a6442b5ca2dae1415f1d79a881de896482
Jul 19 16:16:33 L1ERPC op-proposer[33131]: t=2025-07-19T16:16:33+0000 lvl=info msg="No proposals found for at least proposal interval, submitting proposal now" proposalInterval=30s
Jul 19 16:16:33 L1ERPC op-proposer[33131]: t=2025-07-19T16:16:33+0000 lvl=info msg="Proposing output root" output=0x9838ec01cd17f6a5820f45fa4e548ccf3a256ccf832a3d01259df4fbe68032ec block=15840
Jul 19 16:16:33 L1ERPC op-proposer[33131]: t=2025-07-19T16:16:33+0000 lvl=info msg="Publishing transaction" service=proposer tx=0xa23c2b1382c420246a1d6f130568b045b253d0d50c20705ce582a2ab7a4fa1ba nonce=585 gasTipCap=1000000000 gasFeeCap=3000000000 gasLimit=385915
Jul 19 16:16:33 L1ERPC op-proposer[33131]: t=2025-07-19T16:16:33+0000 lvl=info msg="Transaction successfully published" service=proposer tx=0xa23c2b1382c420246a1d6f130568b045b253d0d50c20705ce582a2ab7a4fa1ba nonce=585 gasTipCap=1000000000 gasFeeCap=3000000000 gasLimit=385915 tx=0xa23c2b1382c420246a1d6f130568b045b253d0d50c20705ce582a2ab7a4fa1ba
Jul 19 16:16:45 L1ERPC op-proposer[33131]: t=2025-07-19T16:16:45+0000 lvl=info msg="Transaction confirmed" service=proposer tx=0xa23c2b1382c420246a1d6f130568b045b253d0d50c20705ce582a2ab7a4fa1ba block=0xabff34c757fef25c976668681fb9e9123a6e86c5ee71d98009d71d3513cd10a0:27375230 effectiveGasPrice=1100000000
Jul 19 16:16:45 L1ERPC op-proposer[33131]: t=2025-07-19T16:16:45+0000 lvl=info msg="Proposer tx successfully published" tx_hash=0xa23c2b1382c420246a1d6f130568b045b253d0d50c20705ce582a2ab7a4fa1ba l1blocknum=27375227 l1blockhash=0x52617315655dda0bed2f806e92b1470ff12cc1302669490d79b4b65cba7450c7

Feature Description

No response

Purpose and Benefits

No response

Relevant Context or Examples

Configuration Values:

• Sequencer window: 21,600 blocks (≈6 hours at 1s block time)
• Max sequencer drift: 3,600 seconds
• L1 confirmations required: 2 blocks
• L1 confirmation time: 1 second
• RPC response time: 0.06ms (eRPC with 3 aggregated local nodes)
• Batching frequency: 30-second channels
• Current deviation: +1 block per cycle (linear growth)
• Game type: 1 (Fault Dispute Game)
• All components: 1-second polling intervals

Impact: If uncorrected, deviation will reach seq_window_size limit, potentially triggering synchronization failures or requiring manual intervention.

[opfocus]

https://docs.optimism.io/operators/node-operators/configuration/consensus-config#l1http-poll-interval
Could you try lowering the value to see note： https://docs.optimism.io/operators/chain-operators/configuration/rollup#l2blocktime

[0xAurelou]

Thanks for the answer. Concerning the L2 block time, it appears there is a problem as indicated in the documentation:

l2BlockTime
The interval, in seconds, between each L2 block. This value must be less than the L1 block time (12 on mainnet and Sepolia).

Type: Duration in seconds
Default: Not set
Recommended: Not specified
Constraints: Must not be zero. Must be a whole number and less than the L1 block time.
Standard Configuration Requirement: 1 or 2 seconds

We are unable to set a value lower than the current 1 second as the rollup.json file requires an integer.

[opfocus]

I noticed this, it seems like a conclusion, but I'm not sure why

[0xAurelou]

Not solved closing this ticket in a non sense because the issue still exist and not really answered by Optimism on the root of the issue

[opfocus]

Sorry, using different da is part of the op stack hack and we are having a hard time finding the right people to support
solving the issue. I will reopen this issue