Sending, site transactions, site signatures and private key export derived the key at the address's position in the wallet's list. After an import whose scan passed over an unused index, or after removing an address that was not the last, that position named another address's key. Each HD and xprv address record now stores the index it was derived at (at wallet creation, by the import scan, by "+"). getSignerForAddress() derives at that index, refuses a record without one, and refuses any key whose address differs from the record's. The confirmation screen signs as the From address it shows, not the selected one. The export screen reports a refusal instead of calling the password wrong. Model: opus-5-5