Default Extra Data Standard

---

name: Extra Data category:

Implementations are encouraged to follow this protocol for populating the extraData field of mined blocks.

extraData should be an RLP list whose first element is a version identifier encoded as a canonical RLP positive integer. All other items in the list are determined by the version ID.

[ version: P, ... ]

Version 0

[ version: P, clientIdentity: B ]

One further argument, a raw representation of a string to identify the client (this would usually be a shortened form of the client identifier as returned by the JSON RPC's web3_clientVersion).