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2D barcode on the letter,, package,, etc..
2D barcode on your mailbox and/or doorbell or somewhere convenient to scan.
Postal workers/Amazon/whomever scans your mail, for which the code has been hashed by the date code or whatever for some security.
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To facilitate remote scanning from a passing postal vehicle, just adjust the spacings of your white picket fence. This has the added benefit of making the Moiré effect more disturbing. |
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My front door (on which are mounted my letterbox and doorbell) has a convenient 2D unique identifying code on it, in the form of Arabic numerals. |
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My front porch has that sort of technology, as does my neighbor. But it doesn't prevent him (1217) from getting my mail (1277) and vice-versa. |
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