Use it.

Mint an SF128 identity, then generate a serialized notebook bound to it. Every page carries a short code derived from a verifiable Merkle hash chain. Print it, write in it, verify any page later.

Mint an identity

Every notebook is bound to an SF128 identity. Mint one here, or paste an existing one below.

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Generate a lost-item card

Create a printable 4×6″ card with a scannable barcode and verification token. Attach it to anything you want returned if lost. The barcode is a QR/Data Matrix composite — finders can scan it with any phone camera or the scanner.

Generate a notebook

Create a printable serialized notebook. Each page carries a short code (AAAAA-BBBBB) in the upper corner, derived from a SHA-256 Merkle chain rooted in your SF128 identity. Every 32 pages, a checkpoint page lists the codes and chain hash.

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