fix(l1 follower, rollup verifier): blockhash mismatch #1192

jonastheis · 2025-05-29T07:40:15Z

1. Purpose or design rationale of this PR

This PR fixes the problem of mismatching block hashes due to the missing header fields difficulty and extraData in DA. It should be reviewed in conjunction with #903, which provides a way to prepare this missing data and describes the format in more detail.

Specifically, this PR implements a missing header fields manager that:

lazily downloads the missing header data if not present
verifies SHA256 checksum of the missing header fields data with hardcoded checksum that is part of the chain config
provides functionality to read the missing header fields when syncing from DA

Tested on Sepolia:

make nccc_geth && ./build/bin/geth --scroll-sepolia --scroll-mpt \
--datadir "tmp/sepolia-test" \
--gcmode archive \
--http --http.addr "0.0.0.0" --http.port 8545 --http.api "eth,net,web3,debug,scroll" --http.vhosts "*" \
--da.sync=true \
--da.blob.blobscan "https://api.sepolia.blobscan.com/blobs/" \
--da.blob.beaconnode "<beacon node>" \
--l1.endpoint "<L1 endpoint>" \
--verbosity 3

INFO [06-02|10:38:58.797] Downloading missing header fields. This might take a while... url=https://scroll-block-missing-metadata.s3.us-west-2.amazonaws.com/534351.bin
INFO [06-02|10:38:59.560] Downloading missing header fields... 0 MB / 801 MB 
INFO [06-02|10:39:04.586] Downloading missing header fields... 7 MB / 801 MB
[...]
INFO [06-02|10:42:25.322] L1 sync progress                         L1 processed=4,041,836 L1 finalized=8,459,461 progress(%)=47.779 L2 height=4370 L2 hash=0x89432d03f5f784437327a599d16a32bbc787d344e8bd5f5963c6f21c38479e0a

After a restart the header file is not downloaded again. The L1 syncing process can just continue. As can be seen the generated block hash matches.

$ cast block 4370 --rpc-url=https://sepolia-rpc.scroll.io


baseFeePerGas
difficulty           2
extraData            0xd883040321846765746888676f312e31392e31856c696e757800000000000000d83352a5203d2199e97ef277d284adeb6a0304925e8ccdc2abe09c402b8d6d1a3433bbc09a57ffd77be1dc366341a889e01918ad49c1cb54f4ed56c465c3183600
gasLimit             8000000
gasUsed              55018
hash                 0x89432d03f5f784437327a599d16a32bbc787d344e8bd5f5963c6f21c38479e0a
logsBloom            0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000800000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000200000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000
miner                0x0000000000000000000000000000000000000000
mixHash              0x0000000000000000000000000000000000000000000000000000000000000000
nonce                0x0000000000000000
number               4370
parentHash           0x8b0b592d47119997ec6f6d5db399f712084ae8a3ab107122f66053c32d334db4
parentBeaconRoot
transactionsRoot     0x59e4d1a6e7e106a488aaef32bdac3ba8bbf0fe9e86f696000edfb777bf112c17
receiptsRoot         0x96551d06a025e4f35423661be2b1272341f87b5e362f33c39758fd4979fc3a7a
sha3Uncles           0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347
size                 991
stateRoot            0x18dcddc6754f95f0209089b0e139858cf27e4420b5e7077a4893e1775486762e
timestamp            1691652216 (Thu, 10 Aug 2023 07:23:36 +0000)
withdrawalsRoot
totalDifficulty      8741
blobGasUsed
excessBlobGas
requestsHash
transactions:        [
	0x3ad69e516079396cbd3240d0b229c06c881ca63b69333eafc97792a6bfb747c5
]

Tested on mainnet:

make nccc_geth && ./build/bin/geth --scroll --scroll-mpt \
--datadir "tmp/mainnet-test" \
--gcmode archive \
--http --http.addr "0.0.0.0" --http.port 8545 --http.api "eth,net,web3,debug,scroll" --http.vhosts "*" \
--da.sync=true \
--da.blob.beaconnode "<beacon node>" \
--l1.endpoint "<L1 RPC>" \
--verbosity 3

INFO [06-02|12:40:19.157] Downloading missing header fields. This might take a while... url=https://scroll-block-missing-metadata.s3.us-west-2.amazonaws.com/534352.bin
INFO [06-02|12:40:20.179] Downloading missing header fields... 0 MB / 1407 MB 
INFO [06-02|12:40:25.206] Downloading missing header fields... 16 MB / 1407 MB 
[...]
INFO [06-02|10:42:25.322] L1 sync progress                         L1 processed=4,041,836 L1 finalized=8,459,461 progress(%)=47.779 L2 height=141498 L2 hash=0x8828523c2aca67fc54fc52ea45fd3b10743001e7cbc5d0e704cfb3d53ab7b9c7

After a restart the header file is not downloaded again. The L1 syncing process can just continue. As can be seen the generated block hash matches.

$ cast block 141498 --rpc-url=https://rpc.scroll.io


baseFeePerGas
difficulty           2
extraData            0xd883050001846765746888676f312e31392e31856c696e757800000000000000760fcd08267675948a9bd19199347296df16cdf0bb82cd7f36795629ca36ce750cfcd76ee934237b28fdb541e34bf09e41f01447e8e4b9f33601c1195499f59301
gasLimit             10000000
gasUsed              159943
hash                 0x8828523c2aca67fc54fc52ea45fd3b10743001e7cbc5d0e704cfb3d53ab7b9c7
logsBloom            0x00000000000000000000000000000000000000000000000000000000000002000000000000000000000040000000000000000000000000000000000000000000000000000000000000000008000008000000000000000009000000000000000000000000020008000000000000000800000000000000000000000010000420000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000008000000000000000000000000000000000000000020000000000000002000000000000000000000020000000000000000000000000100
miner                0x0000000000000000000000000000000000000000
mixHash              0x0000000000000000000000000000000000000000000000000000000000000000
nonce                0x0000000000000000
number               141498
parentHash           0xb57533a8ef8414506bd8af48884ab7283a653fe1485ea84156921237b0d6691e
parentBeaconRoot
transactionsRoot     0x6c533608b1915b1cdee26aab0f74acd509d37ad99c950fb61e50154751e02f4e
receiptsRoot         0xf39d1001ac70825f2ff1c341efd025b7fbc98812723830f392779f7758f70b8b
sha3Uncles           0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347
size                 722
stateRoot            0x14dcf7f26a6d706785ede826ae68953b0c42c2286ececf260bd1ac0534c0a181
timestamp            1697749500 (Thu, 19 Oct 2023 21:05:00 +0000)
withdrawalsRoot
totalDifficulty      282997
blobGasUsed
excessBlobGas
requestsHash
transactions:        [
	0x1f22baba6174ded8c15abbb20ac9ad21088b26981d789d8783bd1caf1472537d
]

2. PR title

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fix: A bug fix
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3. Deployment tag versioning

Has the version in params/version.go been updated?

This PR doesn't involve a new deployment, git tag, docker image tag, and it doesn't affect traces
Yes

4. Breaking change label

Does this PR have the breaking-change label?

This PR is not a breaking change
Yes

coderabbitai · 2025-05-29T07:40:22Z

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semgrep-app · 2025-05-29T07:41:46Z

Semgrep found 1 ssc-089edcd4-740d-452f-b7f4-23e72908be35 finding:

rollup/missing_header_fields/export-headers-toolkit/go.mod
- L14 - Triage

Risk: Affected versions of github.com/btcsuite/btcd are vulnerable to Always-Incorrect Control Flow Implementation. The btcd Bitcoin client did not correctly re-implement Bitcoin Core's "FindAndDelete()" functionality. This logic is consensus-critical: the difference in behavior with the other Bitcoin clients can lead to btcd clients accepting an invalid Bitcoin block (or rejecting a valid one).

Fix: Upgrade this library to at least version 0.24.2-beta.rc1 at go-ethereum/rollup/missing_header_fields/export-headers-toolkit/go.mod:14.

Reference(s): GHSA-27vh-h6mc-q6g8, CVE-2024-38365

…port reset of syncing pipeline

colinlyguo · 2025-06-04T03:59:19Z

cmd/utils/flags.go

+	cfg.DAMissingHeaderFieldsBaseURL = DAMissingHeaderFieldsBaseURLFlag.Value
+	if ctx.GlobalIsSet(DAMissingHeaderFieldsBaseURLFlag.Name) {
+		cfg.DAMissingHeaderFieldsBaseURL = ctx.GlobalString(DAMissingHeaderFieldsBaseURLFlag.Name)
+	}


Suggested change

cfg.DAMissingHeaderFieldsBaseURL = DAMissingHeaderFieldsBaseURLFlag.Value

if ctx.GlobalIsSet(DAMissingHeaderFieldsBaseURLFlag.Name) {

cfg.DAMissingHeaderFieldsBaseURL = ctx.GlobalString(DAMissingHeaderFieldsBaseURLFlag.Name)

}

cfg.DAMissingHeaderFieldsBaseURL = ctx.GlobalString(DAMissingHeaderFieldsBaseURLFlag.Name)

might work the same way.

This doesn't seem to work.

WARN [06-05|08:47:48.245] syncing pipeline step failed due to unrecoverable error, stopping pipeline worker err="failed to get blocks from entry: failed to get missing header fields for block 1: failed to initialize missing header reader: failed to download file: failed to download file: Get \"534352.bin\": unsupported protocol scheme \"\""

Oh I think it's because the flag is not added to the node's flag set here: https://github.com/scroll-tech/go-ethereum/blob/scroll-v5.8.52/cmd/geth/main.go#L275-L279
Have you tried assigning it to another URL and seeing if it works?

colinlyguo · 2025-06-04T04:43:53Z

rollup/missing_header_fields/manager.go

+	}
+
+	// rename the temporary file to the final file path
+	if err = os.Rename(tmpFilePath, m.filePath); err != nil {


Would there be a state where the file in m.filePath is created, but the err is still not nil in this line? If so, the file in m.filePath might be corrupted.

Or when ok is false, remove files in tmpFilePath and m.filePath in the meantime.

rollup/missing_header_fields/manager_test.go

rollup/missing_header_fields/reader.go

rollup/missing_header_fields/reader_test.go

implement missing header fields reader and manager

4561826

jonastheis added the bump-version label May 29, 2025

jonastheis changed the base branch from develop to jt/export-headers-toolkit May 29, 2025 07:40

chore: auto version bump [bot]

a47ccd8

jonastheis added 3 commits May 29, 2025 12:00

increase download timeout

5774441

sanitize BaseFee when executing blocks from DA

66f0aef

initialize and pass missing header manager to DA syncing pipeline

7a48a92

jonastheis mentioned this pull request May 29, 2025

fix: blockhash mismatch #913

Closed

13 tasks

jonastheis added 8 commits May 29, 2025 19:43

Merge branch 'jt/export-headers-toolkit' into fix-blockhash-mismatch

30d5a46

add state root to deduplicated header

2ef390e

overwrite state root if given via missing header file

de651d9

Merge branch 'jt/export-headers-toolkit' into fix-blockhash-mismatch

3e33a8a

fix test

7d8bb01

set correct links and missing header file hashes

b90e909

allow reading of previous headers by resetting file and buffer to sup…

51d5c7d

…port reset of syncing pipeline

Merge branch 'jt/export-headers-toolkit' into fix-blockhash-mismatch

eaad65b

jonastheis requested review from Thegaram and colinlyguo June 2, 2025 10:58

colinlyguo reviewed Jun 4, 2025

View reviewed changes

rollup/missing_header_fields/reader_test.go Show resolved Hide resolved

jonastheis added 2 commits June 5, 2025 08:48

address review comments

2ee9190

Merge branch 'jt/export-headers-toolkit' into fix-blockhash-mismatch

56cc282

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