Single ledger to support multiple bakers?

Question

Let’s assume that one single ledger controls several keys associated with corresponding addresses enabled for baking.

Is it possible to use this single ledger and a single instance of the signer deamon that would respond to the queries of multiple baker deamons ?

The reason i am asking this is because i believe that currently when bakers maintain multiple bakers managed with ledger, they actually think they need to own multiple physical ledger devices which seem sub-optimal in terms of operational risks.

Answer 1

No, you cannot bake for two addresses on a single ledger. it is only authorized to sign for a single address at any given time.

Answer 2

The ledger maintains a HWM (high watermark) for "double bake protection" - this means it will not sign more than 1 block at a certain height. I do not believe it is possible to maintain multiple HWMs with a single ledger (except for testing period chains), and so you might get in trouble if baker A signed a block for height X+1 just before baker B tries to sign for block X (this might happen in distributed systems).