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 0x30e7b2369c8a0c69239b8de91e888d3335ced5ea70f0ccbcecee108962ffabeb. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81353617-14b9-467d-9a96-d3d84ace45fa.json and https://artists.proofprofile.net/proofs/artist/81353617-14b9-467d-9a96-d3d84ace45fa.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 0xc9354957c9db57488c3a48465734577543081845a0dfa266b2fdaf98e0bda47f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/PTCN11200296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6276fac0a1189fe6e020a03ae07cf6b7aa09f0c0c8cd75be77653f421d12875d. 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/PTCN11200026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267a838e5c81aef5570cb7448298c182bbd94b497e2d002c66b8175c875b0464. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PT2EO1300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb89b0ee020b3e36ad50704ab95b7adcaae4017e1553695afc29c968ca809cfb. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/PTCN10400339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209f069908d5624719a56ca6c7a8bd221ca5bdfa53fbc938c4735175dc877f21. 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/PT2EO1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bbd91293c10d10899c72aabbad9e5c5f3446652423a75cfc071adce5e6c579. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/PT2EO9900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9c0fd730a73b1d2f591a9d708a6bd0f9966d458499fabae84c6fdd5b582042. 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/PTCN10400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8484d71da19fc6ee2e686db506d7bc6c75d91009ffa7990c1e4c13bbfd84a74. 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/FR59R2032092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ed8e8add72a7b4d0480b4ba98716b1088d9eefa6cb25d83c02d22428a0fd5f. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/FR59R2032093.
Viva Portugal. O Grande Disco do Fado, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8efc4388272670ce3998480193846478011610f000d27942ecf1ae84ad1c604. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PT2EO0900063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133c72b111ce2fee4dea6da983e39d089002e14823f386e544e839101e621f29. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/PT2EO0900068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86f8ea6f5e505e9977e69e4c0f9f2fa3334a73ae3698d2ba172c58247f6acf4. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/FR2X42089023.
Vi Partir o Meu Amor (Fado Carlos da Maia Quadras)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68637d04a37ad482e383d788d2abf5664271f750c80f9213b3b4865bbde99356. 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/PTRU11100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd78c3992758de9531d0be507b5bb4c4f4661d358bf2e4b886d361370205e51d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/PT2DH1500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f62de76cdfd72e47dd7568bc46d205c47f258f2e610c2e91f22c99a1b366668. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/PT2DH1500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f174b663026d6b3cf112357e429b704208573c4dc6c32cb5a6cfdc10a8ced0. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/PT2DH1500038.