15. The method of claim 9 , further comprising: scanning, by the at least one processor, the seal applied to the physical object to determine the source identifier that is encoded in the seal; and employing, by the at least one processor, the source identifier to verify the source user associated with the physical object.
9. A computer-implemented method performed by at least one processor, the method comprising: determining, by at least one processor, a source user associated with a physical object; determining, by the at least one processor, a source identifier that identifies the source user; generating, by the at least one processor, a seal that encodes the source identifier of the source user, the seal being applicable to the physical object and including a near field communication (NFC) tag that, when scanned, emits a signal carrying the source identifier, wherein the NFC tag is configured to remove the source identifier from the NFC tag in response to a first scan of the NFC tag.