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 0x75fc675a0859dc02f8a56d73042e5e81c52030a236ef8e00d95b9a46b621c622. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d92121e-8c26-4b6c-b799-7e0dd555d83b.json and https://artists.proofprofile.net/proofs/artist/3d92121e-8c26-4b6c-b799-7e0dd555d83b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bruckner: Symphony No. 2 in C Minor - Franck: Symphony in D Minor; Symphonic Variations for Piano and Orchestra
Gilson: De Zee - De Boeck: Symphony in G
Bruckner: Symphony No. 3 - Dvořák: Symphony No. 9