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 0x2c4cf793341e5852c67f237fe6eb0382aab35793a9a60d97b21b59031803481c. Chain 2 (Bitcoin): anchored in block 954008 (2026-06-16T21:31:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3247ba40-fc28-4301-a416-346fd1a5bf45.json and https://artists.proofprofile.net/proofs/artist/3247ba40-fc28-4301-a416-346fd1a5bf45.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Harmonika Familien Vol. 1 - Good Old Days
Harmonika Familien Vol. 3 - Good Old Days
Harmonika Familien Vol. 2 - Good Old Days