Client Diversity
who builds the blocks

Each block's proposer is inferred from a small client identification segment in the block's graffiti.

Examples:

• ssv.network BUde8dTK6c8b for Besu/Teku
• 𝕡𝟚𝕡․𝕠𝕣𝕘 BUPR for Besu/Prysm

Blocks without the client identification are counted as unknown.

Many blocks carry no client identification, so every share is a lower bound: read it as “this client has at least X% of blocks”.
The true share is likely higher. Three reasons blocks stay unidentified:

• Each client added or changed the client identification behaviour at a different version, some only after the Fusaka fork. See the ⓘ beside each client below.
• Among major clients, Nimbus does not implement this client identification feature yet (nimbus-eth2#7580).
• Every client implement this feature, except Prysm, offers a way to disable the client identification.

Conversely, a validator could deliberately set a false client identification code in its graffiti, inflating that client's apparent share — but this is very unlikely.