测试交易

>>> web3.eth.send_transaction({
  'to': '0xd3CdA913deB6f67967B99D67aCDFa1712C293601',
  'from': web3.eth.coinbase,
  'value': 12345,
  'gas': 21000,
  'maxFeePerGas': web3.toWei(250, 'gwei'),
  'maxPriorityFeePerGas': web3.toWei(2, 'gwei'),
})

测试查询

https://goerli.etherscan.io/tx/0x4a14aa0f0b18a8c7aa5677fdd057ffdb77791497d849da164ad42574ce778e5f
显示为

Txn Type: 2 (EIP-1559)

查看交易体

curl https://goerli.infura.io/v3/87aba2e668f9410498cdf74bc7a35467 -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params":["0x4a14aa0f0b18a8c7aa5677fdd057ffdb77791497d849da164ad42574ce778e5f"],"id":1}' | jq

返回

{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "accessList": [],
        "blockHash": "0x5114398c54853f6ad6df7002ff88fad8f95c4ea74a32048275e72795e9381050",
        "blockNumber": "0x51a84c",
        "chainId": "0x5",
        "from": "0x10210572d6b4924af7ef946136295e9b209e1fa0",
        "gas": "0x5208",
        "gasPrice": "0xad731380",
        "hash": "0x4a14aa0f0b18a8c7aa5677fdd057ffdb77791497d849da164ad42574ce778e5f",
        "input": "0x",
        "maxFeePerGas": "0xad731384",
        "maxPriorityFeePerGas": "0xad731379",
        "nonce": "0xf9",
        "r": "0x86e133483aff5415fffc73b30b9c781438655362fe070160d1baf5c6dd4a7b43",
        "s": "0x1241e3560cb2e2354168adfe25f3a6c361694b422ff92bc9eebc124403be846e",
        "to": "0x48f155527f25eb1d4cb2aa32b7e84692aa0025c0",
        "transactionIndex": "0xb",
        "type": "0x2",
        "v": "0x1",
        "value": "0x8ac7230489e80000"
    }
}

链上交易体中存在type字段

跟踪type加入时机

拿web3.py sdk举例

https://github.com/ethereum/web3.py/blob/810b5904466896143315d68352cdc1add93fea1a/web3/_utils/transactions.py#L42
https://github.com/ethereum/web3.py/blob/810b5904466896143315d68352cdc1add93fea1a/web3/_utils/transactions.py#L108

def fill_transaction_defaults(web3: "Web3", transaction: TxParams) -> TxParams:
    """
    if web3 is None, fill as much as possible while offline
    """
    defaults = {}
    for key, default_getter in TRANSACTION_DEFAULTS.items():
        if key not in transaction:
            if key == 'gasPrice' and any(_ in transaction for _ in (
                'maxFeePerGas', 'maxPriorityFeePerGas'
            )):  # if EIP-1559 params in transaction, do not set a default gasPrice if missing
                continue

            if callable(default_getter):
                if web3 is not None:
                    default_val = default_getter(web3, transaction)
                else:
                    raise ValueError("You must specify %s in the transaction" % key)

            else:
                default_val = default_getter
            defaults[key] = default_val

    if 'type' not in transaction and any(_ in transaction for _ in (
        'maxFeePerGas', 'maxPriorityFeePerGas'
    )):
        # default transaction type to '2' if 1559 transaction params are present
        defaults['type'] = '0x2'

    return merge(defaults, transaction)

可以看到当参数中包含maxFeePerGas, maxPriorityFeePerGas任一字段时，则认为是['type'] = '0x2'

结论

交易中的type字段由相应的sdk根据参数规则，自动填充

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