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Transactions

Summary​

  • Same address space and transaction format/fields as Ethereum, so the same wallet software is supported.
  • Transaction types 0 ("legacy"), 1 ("EIP-2930"), and 2 ("EIP-1559") are currently supported.
  • Pre-EIP-155 transactions are allowed on the protocol level, as in Ethereum and many other EVM-compatible blockchains. As a result, users are discouraged from using an Ethereum address that had previously sent pre-EIP-155 transactions.

Address space​

Same address space as Ethereum (20-byte addresses using ECDSA).

Transaction format​

Same as Ethereum. Monad transactions use the same typed transaction envelope introduced in EIP-2718, encoded with RLP.

Transaction type 0 ("legacy"), 1 ("EIP-2930"), and 2 ("EIP-1559"; now the default in Ethereum) are supported. See transaction type reference.

Transaction types 3 ("EIP-4844") and 4 ("EIP-7702") are not yet supported in testnet.

Transactions without a chain_id​

EIP-155 introduced a transaction standard that includes a chain id, to prevent transactions from one blockchain from being replayed on another one.

Transactions on Monad should always set the chain id, except for one very specific corner case:

note

The corner case: Some standard smart contracts such as ERC-1820 use a keyless deployment method (also known as Nick's method) that exploits replayability, as discussed here. In this method, a transaction is submitted on Ethereum but is intended to be replayed on other chains in order to have the contract deployed at the same address on other blockchains.

In order to support this use case, pre-EIP-155 transactions are still allowed on the protocol level (i.e. according to consensus rules) on Monad. This makes Monad consistent with most blockchains including Ethereum. (Blockchains that have tried disallowing pre-EIP-155 transactions at the protocol level have typically ended up reversing course, e.g. Celo.)

However, because of this, please heed the following warning:

warning

Because replay of pre-EIP-155 transactions is allowed, it is discouraged to send funds to an Ethereum address that had previously sent pre-EIP-155 transactions.