The first byte of block-level logsBloom does not match transaction-level logsBloom

[YanhuiJessica]

$ ganache --version
ganache v7.9.1 (@ganache/cli: 0.10.1, @ganache/core: 0.10.1)
$ ganache # start

Expected behaviour

The block-level logsBloom combines the logsBloom of each transaction.

Actual behaviour

The first byte of block-level logsBloom is 0x00, while there's a transaction-level logsBloom with non-zero first byte.

Steps to reproduce the behaviour

contract Test {
    event Transfer(address indexed, address indexed, uint256);
    function Log() external {
        emit Transfer(address(0x2), address(0x1337), 0);    // set the first byte of logsBloom to 0x44
    }
}

call Log() Transaction Receipt

blockHash               0xc3568fd20d6e5fa46aaeca2db8bad32f6f8174a89eeb29ab00ed181080fb50a1
blockNumber             2
contractAddress         
cumulativeGasUsed       23274
effectiveGasPrice       3266499687
gasUsed                 23274
logs                    [{"address":"0x23fdb89edbabe32881186fda672ccf49f0ec1760","topics":["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef","0x0000000000000000000000000000000000000000000000000000000000000002","0x0000000000000000000000000000000000000000000000000000000000001337"],"data":"0x0000000000000000000000000000000000000000000000000000000000000000","blockHash":"0xc3568fd20d6e5fa46aaeca2db8bad32f6f8174a89eeb29ab00ed181080fb50a1","blockNumber":"0x2","transactionHash":"0x6d5679de2266de349177515c9907eeff9fd910c25399c687454d8a8a4a8f79c2","transactionIndex":"0x0","logIndex":"0x0","removed":false}]
logsBloom               0x4400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000020000000000000000000000000a000000000000000000010000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000008000000000000000000000
root                    
status                  1
transactionHash         0x6d5679de2266de349177515c9907eeff9fd910c25399c687454d8a8a4a8f79c2
transactionIndex        0
type                    2

Block

baseFeePerGas        766499687
difficulty           0
extraData            0x
gasLimit             30000000
gasUsed              23274
hash                 0xc3568fd20d6e5fa46aaeca2db8bad32f6f8174a89eeb29ab00ed181080fb50a1
logsBloom            0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000020000000000000000000000000a000000000000000000010000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000008000000000000000000000
miner                0x0000000000000000000000000000000000000000
mixHash              0x805bcd5133115e166bc0eca9510d45ee3f4198a23c85088c98f69bf69365347e
nonce                0x0000000000000000
number               2
parentHash           0x58c08382e219a2004fa42742ceed2a773ff04f94d3c9f35f4fdd28ea788df60e
receiptsRoot         0x8db6c89f4be92481354c076faa162827541acbfa6cca09a5b947103a051caaa7
sealFields           []
sha3Uncles           0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347
size                 668
stateRoot            0xeaf5087ea8e7d2947f2f9e1b286ac1e3b3aab03fd1261b1fdd8503b4efec1caf
timestamp            1696648972
withdrawalsRoot      0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421
totalDifficulty      0
transactions:        [
    0x6d5679de2266de349177515c9907eeff9fd910c25399c687454d8a8a4a8f79c2
]

[davidmurdoch]

It's been a while since I've looked into how the bloom works, but I think the block bloom is a bloom filter itself, not a contactination of the all the transaction logBlooms.

That's not to say the block logs bloom is absolutely correct here, there might be a bug, but I don't think the first byte must be set because the first transaction's bloom has its first byte set. I might be wrong, of course, so please do correct me if so.

[YanhuiJessica]

In Ethereum Yellow Paper, the block-level logsBloom $Hb\equiv \bigvee{r\in B_R}(r_b)$, where $B_R$ represents all the txn receipts in the block and $r_b$ represents transaction-level logsBloom.

I also tried anvil.

$ anvil # start

Transaction Receipt

blockHash               0x018c5487cabd986fe5bf6fb63f1c551a7124e87d574bfb30110eb8ec098df35f
blockNumber             2
contractAddress         
cumulativeGasUsed       23274
effectiveGasPrice       3375999642
gasUsed                 23274
logs                    [{"address":"0x5fbdb2315678afecb367f032d93f642f64180aa3","topics":["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef","0x0000000000000000000000000000000000000000000000000000000000000002","0x0000000000000000000000000000000000000000000000000000000000001337"],"data":"0x0000000000000000000000000000000000000000000000000000000000000000","blockHash":"0x018c5487cabd986fe5bf6fb63f1c551a7124e87d574bfb30110eb8ec098df35f","blockNumber":"0x2","transactionHash":"0x546c585e3ee7e1eed3a753dd830b8aad87f649dfc90221bdbadbb88be1021272","transactionIndex":"0x0","logIndex":"0x0","transactionLogIndex":"0x0","removed":false}]
logsBloom               0x4400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000004000000000000000000000000000a000000000000000000010000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000100000000000000000000000000000000000000000000000042000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000
root                    
status                  1
transactionHash         0x546c585e3ee7e1eed3a753dd830b8aad87f649dfc90221bdbadbb88be1021272
transactionIndex        0
type                    2

Block

baseFeePerGas        875999642
difficulty           0
extraData            0x
gasLimit             30000000
gasUsed              23274
hash                 0x018c5487cabd986fe5bf6fb63f1c551a7124e87d574bfb30110eb8ec098df35f
logsBloom            0x4400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000004000000000000000000000000000a000000000000000000010000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000100000000000000000000000000000000000000000000000042000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000
miner                0x0000000000000000000000000000000000000000
mixHash              0x0000000000000000000000000000000000000000000000000000000000000000
nonce                0x0000000000000000
number               2
parentHash           0xd619acf6229a2ea2326cb9ccfa8adf9ef9f4fc44c6bf313d0bc0613c6cdec053
receiptsRoot         0x92cffb4d820c3f1f43da148dcc831792ec6a28ce9860c7558bc9eb04471638d4
sealFields           [
    0x0000000000000000000000000000000000000000000000000000000000000000
    0x0000000000000000
]
sha3Uncles           0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347
size                 635
stateRoot            0xfbe79a6cbc3ce180a2fa34e6089e9aa3a1b1aa1f13205140981f610c75446656
timestamp            1696729796
withdrawalsRoot      
totalDifficulty      0
transactions:        [
    0x546c585e3ee7e1eed3a753dd830b8aad87f649dfc90221bdbadbb88be1021272
]

[davidmurdoch]

There are 2 hard problems in computer science: cache invalidation, naming things, and off-by-1 errors. 😅

https://github.com/trufflesuite/ganache/pull/4535

I just need to add a test before I can merge.