A wallet's on-chain list of trusted devices.

Using one self-custodial wallet across devices means copying the secret between them, and every copy is another place it can leak.

SciPHR keeps the key on each device and lists the devices instead. Every XRP Ledger account publishes an identity record, a DID document defined by the XLS-40 standard, holding a public key for each enrolled device and nothing that can spend. A new device generates its own key on the phone, and a DIDSet transaction signed by an authorized key adds it. Removing one works the same way.

Think of a directory of which badges open the door, where the badge itself never leaves your hand. The list is public, and only the account can edit it.

Because only an on-chain signature can change that list, a stolen phone or a phished Apple ID cannot add itself. An identity built from public keys lets one account span many devices with no shared secret to lose.