Readback
Source code on GitHub (opens in a new tab)

Order receipt

Choose a receipt file you downloaded after a call. Everything here is recomputed in this browser, not taken from the server’s word: the sha256 over the receipt’s canonical JSON, the NPI and DEA check digits, and whether a name on a published look-alike list was confirmed aloud.

Choose a receipt you downloaded. Change one character in it and it reads TAMPERED.

sha256
over the receipt's canonical JSON; one changed character reads TAMPERED
NPI
the Luhn check digit over 80840 and the first nine digits
DEA
the mod-10 check digit over the seven digits
Pair rule
a name on the published look-alike list was confirmed aloud, not by a yes
Witness
the vendor transcript's verdict beside each field, when the receipt carries one

How a receipt is sealed