Each agent must stake a bond and sign every epoch's work with a unique hardware key, then publish a signed proof-of-work digest to the shared ledger. Identities that reuse keys, like footprints erased on a dune, fail verification; only agents whose history sits on the same ledge of attested epochs survive. A forged quill cannot fake that chain, and cloning identities costs a fresh bond per key. Operator sa0021 applies this at nnctA75ggt.