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 0x54d8ef055c4256f517eb6de941f097496e10f6d3ee8bbd443ed2a15bda1f2347. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0a20a334-e94d-4f74-8371-7d7fe70bdc0c.json and https://artists.proofprofile.net/proofs/artist/0a20a334-e94d-4f74-8371-7d7fe70bdc0c.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 0x85dc65758dd322442cded3d7675ec98c5e458af5d760ca521d079818435569b0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLE421702601.
Les Pêcheurs de perles, WD 13, Act I: Sur la grève en feu où dort le flot bleu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1124cc829dfb448308c1436ddd808ad3f114e3d39abc5528d3beceaac501a5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLE421702602.
Les Pêcheurs de perles, WD 13, Act I: Au fond du temple saint
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf271777a4c091bdd69bb5c5ed4e5d45bbf45aa34a7bd82a1794be5943b9f9a07. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLE421702606.
Les Pêcheurs de perles, WD 13, Act I: Je crois entendre encore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847aa01d9e284a691851487656b55d9647e8cdc33484e7322c59684aa74e6c4c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLE421702611.
Les Pêcheurs de perles, WD 13, Act I: Ô dieu Brahma!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b17ef6a17d377ab80b20985cca4d57fc26f2e139b046837eb25ee39228eb735. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:16:44Z), 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/NLE421702613.
Debussy: Jeux; Nocturnes; Prélude à l'après-midi d'un faune
Prélude à l'après-midi d'un faune, L. 86
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdf2754cd27ba9719931a1e9e6dfd9da6bf264bfdf66e912c441d0d739f65eb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR4KC1801001.
Madin: Te Deum pour les victoires de Louis XV (Live Recording at La Chapelle Royale du Château de Versailles)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9d2a637bd58bbf62382d412ca69865f84fa93b58e1e05483066015db878582. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR7JM1887010.
Cantate domino, SV 292 (arr. for instruments)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac824d11609c07c604ae669bbd35777b7f3c395727a1dad56bebd1135de672e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR7JM1887110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30198ee3432a5055f2545b4a4383de6848079e32321cfc4bd7ace43c7e06d59e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR7JM1887130.
Schütz: David & Salomon. Psalmi, Canticum Canticorum
Schumann: Missa sacra; 4 doppelchörige Gesänge
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81d589f0c898cfc4749665fdff09d46f367cc1ab7e33084c66e9215bdcca9ed. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR0V61204404.
Schütz: Psalmen Davids sampt etlichen Moteten und Concerten, Op. 2: Danket dem Herren, denn er ist freundlich, SWV. 45
Train Traveller: Madrid-Valencia, Valencia-Madrid (1 Hour and 35 Minutes of Musical Pleasure)
Il quarto libro de madrigali a cinque voci: No. 7, Ecco ò mia dolce pena
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636fa3675c0bf1f4a3c1919ae8771c1f7c941f99011637eca8caead4f9c90e1c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR7JM2421010.
Il sesto libro de madrigali a cinque voci: No. 10, Io pur respiro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031614141c9b0c5479fd2efbd0199d8d23022218f06de14cda1ec9ccb97d0ea7. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:19:05Z), 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/FR7JM2421030.
Musica prisca caput: No. 53, Musica prisca caput
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ec287ffafea63746aa388a6a807c35ec4ddd401dd97d994f90cd5989d990a8. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/FR7JM2421090.
Les grandes eaux musicales de Versailles
Gesualdo: Il sesto libro de madrigali a cinque voci: No. 17, Moro, lasso, al mio duolo