I am testing Ethereum on a private network. While verifying the transaction fees received by a validator, I noticed a slight discrepancy between the calculated transaction fee and the actual transaction fee.
Here are the values retrieved
From eth.getTransactionReceipt:
{
blockHash: "0x35291ba92d58e8427e19a5e5c485e5c5f05585bcd0a84084ab5167c3180894b7",
blockNumber: 812,
contractAddress: null,
cumulativeGasUsed: 21000,
effectiveGasPrice: 1000000007,
from: "0x123463a4b065722e99115d6c222f267d9cabb524",
gasUsed: 21000,
logs: [],
logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
status: "0x1",
to: "0xdbd40e5d7f282700aa28315129b550e4b2bd3449",
transactionHash: "0xec9b83ff08a6157d88a7205ebd1724abd0c4f0a6472900000eeda82c5b282694",
transactionIndex: 0,
type: "0x2"
}
From eth.getBlock:
{
baseFeePerGas: 7,
difficulty: 0,
extraData: "0xd883010e0c846765746888676f312e32322e32856c696e7578",
gasLimit: 30000000,
gasUsed: 21000,
hash: "0x35291ba92d58e8427e19a5e5c485e5c5f05585bcd0a84084ab5167c3180894b7",
logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
miner: "0xdbd40e5d7f282700aa28315129b550e4b2bd3449",
mixHash: "0xa44d27625f3f7553202488b20178d8707382c47a602712ecd0099feb79e8d19a",
nonce: "0x0000000000000000",
number: 812,
parentHash: "0x4e86939660aa9db3d2393714ed73caeec15539c8da664685afb042fdada035c4",
receiptsRoot: "0xf78dfb743fbd92ade140711c8bbc542b5e307f0ab7984eff35d751969fe57efa",
sha3Uncles: "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
size: 696,
stateRoot: "0x833b1f64f3351d7a7ef5a3432d4c8c37ae8979e0c181d014ca33974fb2655244",
timestamp: 1732533924,
totalDifficulty: 1,
transactions: ["0xec9b83ff08a6157d88a7205ebd1724abd0c4f0a6472900000eeda82c5b282694"],
transactionsRoot: "0xdc94dacc92cfa43ed2834ab65a3aa95f7744c3600502d841002ab5375a86c1c3",
uncles: [],
withdrawals: [],
withdrawalsRoot: "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421"
}
To calculate the transaction fee received by the validator, I used the formula: gasUsed
gasUsed × (effectiveGasPrice − baseFeePerGas) ⇒21000 × (1000000007 − 7) = 21,000000000000
Calculated fee (from the formula): 21,000,000,000,000 wei Actual fee received: 20,999,999,979,520 weiCalculated fee (from the formula): 21,000,000,000,000 wei
Actual fee received: 20,999,999,979,520 wei
What causes the discrepancy between the calculated fee and the actual fee received?