Sorry, I confused a BLS sig with a “multisignature.”
Okay, the fee payers sign BLS sigs… but what accounts do fee payers have? Presumably fee payers are eth1 users and not validators on eth2.
For example, with the “data-root bounty mechanism”, fee payers are eth1 accounts and Block Proposers are eth2 validator accounts, and BPs get paid via eth1 (so an eth2 BP would have both an eth2 validator account and a standard eth1 account).
EDIT: for anyone wondering, the data-root bounty mechanism does not have a post or write-up anywhere. The only written mention of it that I’m aware of is in the first paragraph here: