Just replace the backup with what I said: an “account” you pre-created, which you don’t use until you need it. You can create N “accounts” which are not tied t

Just replace the backup with what I said: an “account” you pre-created, which you don’t use until you need it. You can create N “accounts” which are not tied to devices. In fact, that would also be good for a quotum to “outvote” whoever found M devices, to repudiate them. (Otherwise it would have been a stalemate.) Using “virtual accounts” you can bootstrap from one private key + U of V keys from a set that you gave to friends + family, to reconstitute your account should something go wrong and you lose ALL your devices. So, just to be clear: either a private key is stored in a device, or it would have to be paired with U of V other keys that you gave out, in order to activate a new device one time with that key. But the real provisioning and repudiation of keys would be in a smart contract on the blockchain. That is — pardon the pun — the key to the whole thing :)