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 0xca0989040f0896076e0e5dfa5649192864ed095c5a71409696f8cbe5dc22c6c0. 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/bdf0381b-4257-42bc-8e85-a361689a2f40.json and https://artists.proofprofile.net/proofs/artist/bdf0381b-4257-42bc-8e85-a361689a2f40.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x6dff5b8e9098cf95ae17278bd1558da23bb604c39b1740c07df178f3435796b8. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZES52242020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65136f5e395c698864095e2530e959d670db51f7f4823f389dbbe2b045919bb1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES52242021.
Variations No. I, Mozart: Alla Turca (Turkish March)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02792cb1c2b453df869ebb5821478e16c6b496f42c695804be9cc73a58b8e3a9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZPLS2210754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2a30e4f9f90985d0bfecbb6f0f2d9ea3c5f6eedc27a1fd6509f58b63a036a4. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZPLS2210755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b2fa79380bad942e03824f904cf8617c5382b783dd2df7f90f30918e9f4abb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZPLS2210756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f3a956991f878ac39d75cc81195c3f339a1e3baed8fa3997ac9a23b704642a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAZ2226976.
Variations No. III, Beethoven: Für Elise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd3dc0ac1e7f7e437d4c86f1ae0a3ac8dffa00a3fdf657642f632754a5eb697. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZFZ62331362.
Variations No. IV, Erik Satie: Gymnopédie No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd994dfdfa1afc8bb28770b18a26e5240666f8ceae94357757c7109bb500828bb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN92395978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9cf5fa923d1c76ed055d34fa341ebfbf497696a1fcc7daea8de26ff6fd1888. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZHN92395980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8853674001fb381acbc8e30ba57f05ea64a1598cda62d6704d32b314a904f1b6. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHN92395981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739d6b9e46d58c25b645531b555a9f9a854d2704af9e4a8370985930e551a3b8. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZHN92395982.
Variations No. V, Grieg: Peer Gynt Suite No. 1, In the Hall of the Mountain King
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6035a2d2e530fe649af00015a6ec1bfc13e87ddc7baf1f05e0ead473ad5a3ad1. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZMEP2328132.
Variations No. VI, Chopin: Fantaisie-Impromptu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d834a73394fa7636806d9b728e0c73d80c1a4e8f53603f032a5357a9ebca7b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZES52464330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5090f1e39b1b7e2911d88c5948bd3a5ee4533ea244d4ae72a15d6204242de3f7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWV2219210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f3a956991f878ac39d75cc81195c3f339a1e3baed8fa3997ac9a23b704642a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAZ2226976.