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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910dd1ad0fefdb89aa66e9f1915abfcf1f91395e95b74f7f5167294fe3681478. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8b27e25-24b5-47c5-a724-a92cf94aac75.json and https://artists.proofprofile.net/proofs/artist/d8b27e25-24b5-47c5-a724-a92cf94aac75.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hadyn: 5 Variations in D major, Hob. XVII:7
Piano Sonata No. 1 in C Major, Hob. XVI: 8
Piano Sonata No. 2 in C Major, Hob. XVI: 7
Piano Sonata No. 3 in F Major, Hob. XVI: 9
Hadyn: 6 Variations in C major, Hob. XVII: 5
Piano Sonata No. 50 in D Major, Hob. XVI:37 (I. Allegro con brio)