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 0x5d354e98e8186afbe32dc820d0ef033b3ab9cb3be2dc5bb0b11553afde1a8b52. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bf95bbc-04b9-411e-96db-378a8467d915.json and https://artists.proofprofile.net/proofs/artist/1bf95bbc-04b9-411e-96db-378a8467d915.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Maarten Ornstein and W.A.R.P. Music Ensemble
Peis Dinogad (Arr. for Voice, Bass Clarinet, Theorbo & String Quartet by Judith van Driel)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475783d653013acc49c33d05cf47e6814d850ada008ad383434faf86603d03d9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY432300154.
Jig (Arr. for Bass Clarinet, Theorbo & String Quartet by David Faber)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d8c294ffd00c8f595d1c93692226a5a4ff7a40ddcf0c08a1a9a560b3ea1698. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY432300151.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
Oedipus, Z. 583: No. 2, Musick for a While (Arr. for Voice, Bass Clarinet, Theorbo & String Quartet by Mike Fentross & Maarten Ornstein)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1741a27aa0b771532a00c6c4f8491970990f87bdc0cc3160bcb6cb6df12f8c99. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY432300152.
Polska No. 745 (Arr. for Bass Clarinet, Theorbo & String Quartet by Maarten Ornstein)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c144f85d6b90ce5a0f3fc4f9fba612ff60d3cf2a76efd9730ccc0c292d6fda. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY432300155.