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 0x7cc0ca05d6791f8c77438282bfc7894f49cb66a4573a943f1d249f735257dc5d. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4da2c5ec-41a1-4a0e-84d1-ff2ce2c64a50.json and https://artists.proofprofile.net/proofs/artist/4da2c5ec-41a1-4a0e-84d1-ff2ce2c64a50.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 0x34aad47957925d045145ebab185998c476fe907987194413208f826eedb29ec9. 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/SEAEX1648010.
Bonduca, Z. 574 "The British Heroine": No. 17, O Lead Me to Some Peaceful Gloom
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0574e988db078df809c1b7eecd58634996ba95f35f780f2ae87bbc2e873b93a4. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/SEAEX1648020.
Cello Sonata in G Minor, Op. 14 No. 9, RV 42: I. Prelude. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993f8182f5851bf88ec5a6c8d22b073a11d454c8e4bba396b97baea64a7356a1. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SEAEX1648030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8d8f00ce364157b9f7d3d041e4a5968f88c2c6e8d0b6495cffeafa4b66f4da. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/SEAEX1648040.
Cello Sonata in G Minor, Op. 14 No. 9, RV 42: II. Allemande. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a12b6aa9179606f5ab8ae136a9fad21e6aec7f223b55aad2f4f19c02eb2bfe. 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/SEAEX1648050.
Cantate, ariette e duetti, Op. 2: No. 14, L'eraclito amoroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07c70cb7d8bb3d3daff65f10728cfbfb978b71804453c8d5dc503eb224863de. 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/SEAEX1648060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa412a74f799bc8fedad643f863eb626f13c7204ab0bf7aa2c82c24b6f725cb8d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SEAEX1648070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f69df0f66301794c75ed55809767a930b61d3eede6328e9fc1185ff6e0ebcf3. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/SEAEX1648080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfed80dc465bb150d6e46dd0036c132dfebf45a52bd50da6de097e9786a534c. 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/SEAEX1648090.
Il primo libro delle musiche: No. 3, Lasciatemi qui solo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c28173992f2b73ea30d8d110341c366dc9ec9aa51fc17d4ec316a9b45c91e6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SEAEX1648100.
Diporti di Euterpe, Op. 7: No. 4, Lamento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ef0643a821b68c53e26a999c19056b07e19fa78d85667bc2730e5116532c43. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/SEAEX1648110.
Cello Sonata in G Minor, RV 42: III. Sarabande. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c6a0f6431d56856bc9a74c805e5397c912a32b6d983b007d94a3dfdfc2c800. 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/SEAEX1648120.
Cello Sonata in G Minor, RV 42: IV. Gigue. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcf2094cf0852c508b323f3ac93a820068492d5660328d7429a6512a1a7ef94. 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/SEAEX1648130.
Componimenti musicali de motetti concertati: O magnum mysterium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cde49cb0e0706321aa92e2318c26f5fa6ecf6c879046a4df5a8ce364bb09e6. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SEAEX1648140.
Dido & Aeneas, Z. 626: When I Am Laid in Earth "Dido's Lament" (Arr. for Voice, Archlute & Cello)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f3b7c4209d346ab65109757a844e8efb1492029b29765925756c349170e135. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/SEAEX1648150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116fbb775b0ea214025c55d01d5cc13753fdba0d8f55a9bdad53ce729f038680. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/SEAEX1648160.