1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe889e29e01bac9852a63a61706db63f9125c9a4899f1e035df880c5a185410. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf5c83d0-d224-45f6-b882-e4ea4b3856f3.json and https://artists.proofprofile.net/proofs/artist/bf5c83d0-d224-45f6-b882-e4ea4b3856f3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
On a cosy Winter Night [Ein Strangers to Lovers Liebesroman für kalte Winternächte (Ungekürzt)]
Canada Love [Herzschlag der Wildnis (Ungekürzt)]