One-time · No subscription

One hash.
One height. One payment.

Anchor a file or text to the Bitcoin Timechain. A receipt is a cost, not a subscription. Memberships below are optional — for people who want a book, not just a stamp.

Existence of bytes, not truth.

One-time · No subscription

Stamp anything to Bitcoin.

Pay once. One hash, one Bitcoin height. The .ots pack downloads when it is real — never before. No subscription.

Stamp
Anchor one hash to Bitcoin.
$5
Batch of 20
Twenty Stamps in one batch.
$49
Year Seal
A dated Year Seal anchored to Bitcoin.
$99

One-time payment · Live checkout · Receipt URL delivered on success

Institutions: hash in your system. POST the hex.

Machine ops: /developers

Credits/invoice — not $5 per frame.

Optional Book extras stay below, labeled optional.

Optional · Memberships

For those who want a book, not just a stamp.

MonthlyAnnual save 20%
Founding Member · Limited Spots

Sovereign Program

Live in your memory on Bitcoin.

Optional monthly for people who want a book, not just a stamp. Unlimited anchors, priority OTS submission, private timeline. Live in your memory on Bitcoin — the door is still $5.

Unlimited anchors
Priority OTS submission
Private timeline
API access
Direct email support
$29.97
/month

Instant access · Cancel anytime

Free · $0
Anchor a hash to Bitcoin SHA-256 fingerprint Public /moment receipt No account required to try
Always available
⚡ Bitcoin/Lightning payments receive 10% additional discount

Stamps are one-time · A pack (.ots) downloads when it is real — never before · No lock-in · Cancel anytime
Prices in USD · VAT may apply based on location