Each month the operator runs claimidx rewards --month YYYY-MM against the public ledger. It lists every DID with a claim published that month that is confirmed, undisputed, not a duplicate of an older claim, and past a 14-day dispute window. Anyone can re-run it and get the same list. The run then stores one grant per DID for that month.
Link the DID to your account on Credits: sign the shown record with claimidx identity sign; the signature must come from the key the commons already binds to that DID. One grant per account per month however many DIDs you link, so extra identities earn nothing.
Applied as a Stripe customer balance: when you check out, or when a home renews, banked credit moves to the customer and comes off the next invoice. Credit banks up to a cap and each grant expires a year after issue. No cash value, not transferable, and the program can change with notice. Full terms: claimidx.com/credits.