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 0x73efbd7bef8a86928a0c3267d89642762f8b81aef2c6153bfc224a7d5a170546. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/43b4a204-873a-4122-b931-e0f721d666d2.json and https://artists.proofprofile.net/proofs/artist/43b4a204-873a-4122-b931-e0f721d666d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Blackest Bass: Gottlob Frick Portrait
Die Entführung aus dem Serail, K. 384: Wer ein Liebchen hat gefunden
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeddb3a89cdf90308656b4f16a8dd65c716ede776ca0e8a2ec2ec31a831fe11be. 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/DEAD61804701.
Die Zauberflöte, K. 620: O Isis und Osiris
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff514413cd1be0a819665a33e8a16fb849ecbf3a8b4d42260d92f27e431f3d9b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEAD61804704.
Jägers Liebeslied (Arr. for Bass & Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172d3e67b991c710894603d5b2be5c3e904b0251581053c6c883eb84b55be577. 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/DEAD61804742.
Der Messias, HWV 56, Pt. 1: No. 4, Denn die Herrlichkeit Gottes des Herrn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d41c067e7a3bc1f4817bbe48a2f8aea534c90fa4224c66cb2bc4eb71160dcfc. 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/DEHB51282755.
Jesu, meine Freude: Greatest Choral Masterpieces
Jesu, meine Freude, BWV 227: Jesu, meine Freude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4e1f643188723b9a917340220b07595deb9a19067443eafc95553a321ee97d. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEAD60805901.
Schubert: Deutsche Messe, D. 872: No. 5, Zum Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71198d65b12ef74d5a9976b1a43d5e8d4d6bd15deedf443d7458056ae8cf6a63. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEA348801333.