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 0x9da211594dd72bb567a362f510ac275b7d385090b1a533eebedc411b63f1d0df. 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/61ef70d2-ae48-4116-ade2-0e8b510447fc.json and https://artists.proofprofile.net/proofs/artist/61ef70d2-ae48-4116-ade2-0e8b510447fc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pandolfo, P.: Viola Da Gamba Music (Improvisando)
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 0x6c9cd89c80c35788c08c5ee4336520678e70d3e79a839226c9ea7ad1ee78f1d1. 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/ES7890601101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2121fd97550caa5a3a2afd456084007a5d5feb45d7f250c578d7c7d29f4423b. 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/ES7890601102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d33ec64c27bb1637affee17a5e78330f0c2bebe70c876c7e04b58a7b83a8d8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES7890601103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e8dbfe8c566ddb93696d06d6effc2dd4ca8bc1e95225d99703333181ad7a20. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES7890601104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891de0197de152eeb944c64bab986ef529e53ab3a6ea9784137fa45b7e3bf252. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES7890601105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b62a418854046663b81d84e3050b35cf897bceb638e9c90b15665b0a073dd97. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES7890601106.
Symphony No. 4 in A Major, Op. 90, "Italian": Toccata del Signor Pandolpho
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb158037de413843d6725a94f6797bb0c023686b65cf8ac52ccbcfea2feb14d. 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/ES7890601107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ab0e484dc44f2b9a2145007f65bd3ca096ca3ae3a88eeb9852ad672e2de836. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES7890601108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718a53296d2fbcd11c9060bba7b04b8a1b4ff6f0aeed3dd3b4abfa63796df228. 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/ES7890601109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e93a779b4b1dd7cb26868b784c5260201237b15c11cc45fcdc6742aa15e380a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES7890601110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1fdc78cc3f9142364ef93b4608cc20a50efac2736f3390409b997265450464. 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/ES7890601111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4307674ac84aba92d6722a2dc3dc29dc195c499eeeb802d5f52fe5d616169d74. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES7890601112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375236b489eed9071f4379db9696cf82ae5246fc0d2a340711124ac286cb3b66. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES7890601113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07418e07440ca397292bb053a4b028d9a4a4fdfb5af8de74b257c73496f3794. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES7890601114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4e329630bd67db33df6f0f26658175c3c36e0f79753962b8f53d65b5e10dc7. 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/ES7890601115.