Log in with Nostr, and link a wallet to a Nostr account

Three ways in: a NIP-07 browser extension, a NIP-46 remote signer
(Amber, Amethyst — paste its bunker:// address), or a pasted
nsec/hex key that lives in memory for the session and is never stored.

How an account gets a wallet depends on what we can see, and the two
cases are genuinely different:

  * We hold the key (pasted nsec): the seed is DERIVED from it —
    sha256("coinos:wallet-seed:v1" | privkey) as BIP-39 entropy. The
    same Nostr key always opens the same wallet, on any device, with
    nothing stored anywhere.
  * We only have a signer: deriving is impossible (we never see the
    key, and neither signatures nor NIP-44 ciphertexts reproduce), so
    the seed is ASSOCIATED instead — generated once and published as a
    replaceable event encrypted to the user's own key, which only their
    signer can decrypt. Later logins find and decrypt it.

The second path means the Nostr key can recover the money; the UI says
so before publishing anything. Linking an already-open wallet uses the
same publish path and refuses to overwrite an account's existing wallet.

Co-Authored-By: Claude Fable 5 <[email protected]>

0 files changed, 0 insertions, 0 deletions