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.
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. 12. The method of claim 9 , wherein the seal is a barcode, of at least one dimension, that encodes the source identifier.