Signet

A digital signature file is the modern equivalent of the signet ring.

Tom sealed the letter with wax using his signet ring.

He wore a plain white tunic and purple-trimmed cloak; the only sign of kingship was the golden chaplet on his head and the signet ring on one finger.

I searched about, in surprise, and came on a beautiful baby, in rich swaddling bands, with a gold signet ring tied round its neck.

I had my fathers Signet in my Purse, / Which was the Modell of that Danish Seale:

To carry pure death in an earring, a casket, A signet, a fan-mount, a filigree basket!