Simulate Single Transaction With Override

The method cgp_simulateTransaction allows simulating the single transaction/tx message against the overriden blockchain state, thanks to Go-Ethereum struct StateAccount.

OverrideAccount definition

The code snippet from Go-Ethereum:

// OverrideAccount indicates the overriding fields of account during the execution
// of a message call.
// Note, state and stateDiff can't be specified at the same time. If state is
// set, message execution will only use the data in the given state. Otherwise
// if statDiff is set, all diff will be applied first and then execute the call
// message.
type OverrideAccount struct {
	Nonce     *hexutil.Uint64              `json:"nonce"`
	Code      *hexutil.Bytes               `json:"code"`
	Balance   **hexutil.Big                `json:"balance"`
	State     *map[common.Hash]common.Hash `json:"state"`
	StateDiff *map[common.Hash]common.Hash `json:"stateDiff"`
}

// StateOverride is the collection of overridden accounts.
type StateOverride map[common.Address]OverrideAccount

OverrideAccount is a struct in Go-Ethereum for overriding account fields during message call execution:

1. Nonce: It allows you to specify a custom nonce for the account.

2. Code: You can provide custom bytecode for the account's code.

3. Balance: This field lets you specify a custom balance for the account.

4. State: You can set a custom state for the account using this field.

5. StateDiff: If you prefer, you can apply a state differential (changes to the account state) instead.

StateOverride is a map where you can specify multiple accounts to override with OverrideAccount configurations.

BlockOverrides definition

The code snippet from Go-Ethereum:

// BlockOverrides is a set of header fields to override.
type BlockOverrides struct {
	Number     *hexutil.Big
	Difficulty *hexutil.Big
	Time       *hexutil.Uint64
	GasLimit   *hexutil.Uint64
	Coinbase   *common.Address
	Random     *common.Hash
	BaseFee    *hexutil.Big
}

1. Number: It represents the block number to override.

2. Difficulty: It allows you to specify a custom block difficulty.

3. Time: You can set a custom timestamp for the block using this field.

4. GasLimit: It lets you specify a custom gas limit for the block.

5. Coinbase: You can set a custom address as the coinbase (beneficiary) of the block.

6. Random: This field allows you to set a custom random value for the block.

7. BaseFee: It lets you specify a custom base fee for the block.

Method Payload Signature:

[
      // Either raw tx or unsigned TransactionArgs message
      {
            "from":"0x9718eCd4E97f4332F9652D0Ba224f228B55ec543",
            "to":"0x3a220f351252089d385b29beca14e27f204c296a",
            "gas":"0x393870",
            "maxFeePerGas":null,
            "maxPriorityFeePerGas":null,
            "value":null,
            "nonce":null,
            "data":"0xa9059cbb0000000000000000000000005b9ca044794b2752a12c67d280c70ef595ce57fe00000000000000000000000000000000000000000000000000000000000f4240",
            "input":null
      },
      // Block Estimation State
      "pending",
      // state overriding
      {
            "0x9718eCd4E97f4332F9652D0Ba224f228B55ec543": {
                  "balance": "0x3242123",
                  "code": "0x....f1",
                  "state": {
                        // hash to hash
                        // storage slots layout mapping
                        "0x000..1": "0xfff..ff"
                  }
            }
      },
      // block headers overriding (may be null)
      {
            // block.number
            "number": "0x1173FF5",
            // block.timestamp
            "time": "0x1173ff5"
      },
      // Geth Tracer
      {
            "tracer": "callTracer"
      }
]

Request Example:

curl --location 'https://dev1.cgp.xyz/rpc/mainnet/eth-reth' \
--header 'Content-Type: application/json' \
--data '{
    "jsonrpc": "2.0",
    "method": "cgp_simulateTransaction",
    "params": [
        {
            "accessList": [],
            "from": "0x3718ecd4e97f4332f9652d0ba224f228b55ec543",
            "gasLimit": "0x092a1b00000000",
            "maxFeePerGas":null,
            "maxPriorityFeePerGas":null,
            "to": null,
            "value": "0x0",
            "data": "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        },
        "pending",
        null,
        {
            "0x3718ecd4e97f4332f9652d0ba224f228b55ec543": {
                "balance": "0x5af3107a400fff0",
                "state": {
                    "0x0000000000000000000000000000000000000000000000000000000000000001": "0x0000000000000000000000000000000000000000000000000000000000000002"
                }
            }
        },
        {
            "tracer": "callTracer"
        }
    ],
    "id": 0
}'

Response Example:

{
    "jsonrpc": "2.0",
    "result": {
        "traceDebugInfo": [
            {
                "from": "0x3718ecd4e97f4332f9652d0ba224f228b55ec543",
                "gas": "0x2faf080",
                "gasUsed": "0x92b1b",
                "to": "0x8f10d01670cc16ba5c582ee38cd7a79c299c4445",
                "input": 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