Use case — postal mail alternative

Registered post, delivered in seconds

Send official documents to verified recipients instantly — with the proof of delivery, identity and time that registered post was invented to provide.

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The path of a LetroLetter
Encrypted on device · Verified by PostNumber · Retained 10 years

LetroLetter replaces registered post for official documents. The letter is encrypted on your device, delivered to a recipient verified by PostNumber, and both delivery and receipt are recorded with timestamps you can export as evidence.

Why it moves

Why registered post belongs in Letro

Instant, not days in transit

A LetroLetter reaches the recipient’s verified device immediately, in any country.

Proof of delivery, identity and time

Both parties are verified PostNumber holders; delivery and opening land in a tamper-evident record.

Lower cost, less administration

No printing, envelopes, postage or return-receipt handling. The record is created automatically.

Permanent evidence

Records are retained for 10 years and exported the moment a dispute or audit requires them.

Schematic comparison

The same proof, without the days

Registered post was built to prove service. Letro proves it in seconds — and keeps the record for you.

Registered post
Postal letter
Schematic
Sender
Addressee
address on file · may be stale
RR 4821 771 CH
Return receipt · A/R
signature
date received
×Days in transit at home, weeks across borders
×The letter reaches an address, not a verified person
×Proof is a paper slip that has to be filed, then found again
×Printing, envelopes, postage and return-receipt handling, per letter
Evidential channel
Letro
Schematic
PN-4821-77 · M. Roth
PostNumber verified
LetroLetter · formal template
Receipt recorded
deliveredopenedtimestamped
DELIVERED 14:02:11.62 UTC
OPENED    14:06:33.18 UTC
HASH      3f9a·c204·88de
✓Identity is a PostNumber — the recipient is verified before sending
✓Delivery and opening are timestamped in a tamper-evident chain
✓Encrypted on device, stored under the residency you choose
✓Exportable proof of service, retained for 10 years

Schematic diagrams for comparison. Interface elements are illustrative, not screenshots.

Discuss your deployment model

Standard rollout, private infrastructure, or stricter residency and isolation. The evidential foundation stays the same.

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