nimbus-eth2/docs/the_nimbus_book/src/graffiti.md

Set up Graffiti

You can use your node's graffiti flag to include a short text in the blocks that your node creates. You will be able to see it using the block explorer.

The graffiti can be either a string or, if you want to specify raw bytes, you can use 0x-prefixed hex value.

Command line

=== "Mainnet" sh ./run-mainnet-beacon-node.sh --graffiti="<YOUR_WORDS>"

=== "Holesky" sh ./run-holesky-beacon-node.sh --graffiti="<YOUR_WORDS>"