§ stamp · playground

change one byte. watch the id move.

A stamp id is the SHA-256 of its canonical message — so every field below is load-bearing. This runs the real @orangecheck/stamp-core in your browser. Nothing is published, and nothing leaves this page.

§ input

addressthe signer · BIP-322 identity

content_hashsha256: + 64 hex

content_lengthbytes

content_mimemedia type

signed_atISO 8601 UTC, must end in Z

§ hash some bytes

The create flow hashes a file. Same function, typed input — it fills content_hash and content_length above.

§ canonical message

oc-stamp:v1
address: bc1qw4kmnsfx4y2p0lsrzgu9r8mnqz6xj9k3v2hlqa
content_hash: sha256:2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824
content_length: 5
content_mime: text/plain
signed_at: 2026-09-11T12:00:00Z

224 bytes · no trailing newline

§ stamp id

25ef005d44d89709d368fd5af5f8eb91ba4ddc23d5fb024a98710375ab3e3e21

This derives an id. It does not check a signature and it does not walk an OTS anchor — both need a wallet and a Bitcoin block, and neither happens on this page. A real stamp is only worth something once those two hold; /verify does that part.