Limit account nonce to 2^64-1

FinalStandards Track: Core
Created: 2020-04-25
Alex Beregszaszi (@axic)
DiscussionsOriginal linkEdit
1 min read

The EIP-2681 proposal limits the account nonce in Ethereum to 2^64-1. This means that no account can have a nonce value exceeding this limit. However, as of November 2020, there is no account in the state that has a nonce exceeding this value.

Anyone may contribute to propose contents.
Go propose


Limit account nonce to be between 0 and 2^64-1.


Account nonces are currently specified to be arbitrarily long unsigned integers. Dealing with arbitrary length data in the state witnesses is not optimal, therefore this EIP will allow proofs to represent the nonce in a more optimized way.

Additionally it could prove beneficial to transaction formats, where some improvements are potentially sought by at least three other proposals.

Lastly, this facilitates a minor optimisation in clients, because the nonce no longer needs to be kept as a 256-bit number.


Introduce two new restrictions retroactively from genesis:

  1. Consider any transaction invalid, where the nonce exceeds or equals to 2^64-1.
  2. The CREATE and CREATE2 instructions' execution ends with the result 0 pushed on stack, where the account nonce is 2^64-1. Gas for initcode execution is not deducted in this case.


  1. It is unlikely for any nonce to reach or exceed the proposed limit. If one would want to reach that limit via external transactions, it would cost at least 21000 * (2^64-1) = 387_381_625_547_900_583_915_000 gas.

  2. It must be noted that in the past, in the Morden testnet, each new account had a starting nonce of 2^20 in order to differentiate transactions from mainnet transactions. This mode of replay protection is out of fashion since EIP-155 introduced a more elegant way using chain identifiers.

  3. Most clients already consider the nonce field to be 64-bit, such as go-ethereum.

  4. The reason a transaction with nonce 2^64-1 is invalid, because otherwise after inclusion the sender account's nonce would exceed 2^64-1.

Backwards Compatibility

While this is a breaking change, no actual effect should be visible:

  1. There is no account in the state currently which would have a nonce exceeding that value. As of November 2020, the account 0xea674fdde714fd979de3edf0f56aa9716b898ec8 is responsible for the highest account nonce at approximately 29 million.

  2. go-ethereum already has this restriction partially in place (state.Account.Nonce and types.txdata.AccountNonce it as a 64-bit number).

Security Considerations


Copyright and related rights waived via CC0.

Further reading
Anyone may contribute to propose contents.
Go propose
Adopted by projects
Anyone may contribute to propose contents.
Go propose

Not miss a beat of EIPs' update?

Subscribe EIPs Fun to receive the latest updates of EIPs Good for Buidlers to follow up.

View all
Serve Ethereum Builders, Scale the Community.
Supported by