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 0x8495bfd84a638425fa37a02708a1d5b3136e76747777c19979680b3e8c8e5239. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56cc81ae-d219-49b1-a00c-a028bc541ac7.json and https://artists.proofprofile.net/proofs/artist/56cc81ae-d219-49b1-a00c-a028bc541ac7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Campra: Messe de Requiem: I. Introit. Requiem
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 0xcdf32620de9e908c844b0f1c001fce068dcc3d9b847e4e4c4011e31773658b35. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300085 — a six-check JSON result.
Campra: Messe de Requiem: II. Kyrie eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6719bb24ebe47e0b6f7e4fa3ea642bbfd8262df1775982cabe4de3a5382531ba. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300086 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a50b6f3870024d2559aa9f2271de1ff34dcdbf601574aa963ba0e1e2be7bacf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300087 — a six-check JSON result.
Campra: Messe de Requiem: IV. (a) Offertoire. Trio. "Domine Jesu Christe"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e6875f91e4f629b8d1dc84963d890dbb668c3fb355a5990db8d3e6a3f3d54b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300088 — a six-check JSON result.
Campra: Messe de Requiem: IV. (b) Offertoire. Chœur. "Sed signifier sanctus Michael" - "Hostias et preces tibi Domine"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20d2c2a8984fa0d75b97e2fe3f8053943f36e79a308fe83641f950281fada8e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300089 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43afb0ce666a57dd7cb6da751e0c26e12bdb743f4cdbcfb5232feef3c40cff51. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300090 — a six-check JSON result.
Campra: Messe de Requiem: VII. Communion
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f53125c4190bd5dc804e2a0a947e6228e3388ccc0855fdd407b5ad44645cd5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300092 — a six-check JSON result.
Rameau: In convertendo Dominus: I. Récit. "In convertendo Dominus"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51172b80f5a6fd8753f7c1b1b2b4c798e403105dcefecd749445605f2106fb1e. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300093 — a six-check JSON result.
Rameau: In convertendo Dominus: III. Duo. "Magnificavit Dominus"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d83bae5a1ce744ee44c5cc72cfedf65758a6f2dc295484492cd717f6407008. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300095 — a six-check JSON result.
Rameau: In convertendo Dominus: IV. Air. "Converte, Domine"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e674e5751157164826b932affe7b4d4ea80192756596a29174f457c73e0ab6e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2300096 — a six-check JSON result.