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 0x5e2003f1bb676a679a0570a88486dc0893a13258cec936e6b0c8dab2c8998a1c. 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/a3d390f7-9148-40bf-9869-764cf810cb9d.json and https://artists.proofprofile.net/proofs/artist/a3d390f7-9148-40bf-9869-764cf810cb9d.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 0xca65a35ee276363ea737102da0dd7f95f82af5f0cc802b08de294200a263db71. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZTBF2362584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8887c3a533242efc922d66ae517f7f7aa833514484de1e9971673274663b89. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZWFG2348741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf142f355c1bd4561e0a9563a69f276574efea02bbdab28c84ce434602687174b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDA72469356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1eaa354dc2e2de63f0bb83a061c4ca94c67de66ead12ab84d4379c2a591620. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHNA2482343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5406cf8ee34b6112eac9dc2bae4f968eadae9acb80c52c65ccd2b61533b8fbda. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZTB72425426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52897353e955069f6761830d1dd0cbd4c60ce6bb9dd51e27b3e0041a70d8674. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFV2465812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fee3457367e525dd625a618df757ba71412dc265aeaf57ab1db56ee995ad95. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QT3F32428019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3fb8f337a4504a310c7db563b03c4688ac13a07c1ebbab0fd4cc779bd3c901. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QT3F32428020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3166157f464a66c0fb34b84308d0e3545eebbf987a537711d13d60b035ce6a4d. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QT3F32428021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66a7e8cb1680b211ae6701482ea9d1481db60d559696526e29ab529e93dff36. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QT3F32428022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f8df8870016f01abf1463d9aedaa6a578161d6c726b6bbf562dde040a5e828. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QT3F32428023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cf5672aa940a34e48da95fa845e6bf8db010ec6ef0e53093b156befd7fc75b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6K2509320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f26c0286494963b3558d70f2302e3c467ad8376958e3b24734af468c84e805. 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/QZGLS2592027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1f95ae07a69ca9b267452b6f47a885763fabfcf4ac99b53ec857d22a658c40. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZNWR2526486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297444d8b36e61d393c61900184a8527e65f77b249da240d426a5b3bf0e5313d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWR2546113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e99a93b4b20a11ee79ea6ee127fa24fb17bdb58bf5971769e8cc2d5aeb93c1. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTAS2528108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9460b9437fdc32829924d115550b7670e802fc7124f10cefe945b573f603834c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFG2524439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931ef847b094077bd86705cf7d1e6ce36b5dac752dc85a79f65b909808db2ff3. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZZ7P2592943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd161b64988305565658ea00c7c0cf145f13328272e57b4c6535cc9c77fb1f1ad. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZZ7P2592945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4619d39072667755f96b9f920ec6f06a52bac1c6349a783a266b97a651a01bfd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT3F92570551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbc4ea2aaf69dd4c7eeaeca833babf3b409f262aff15978995c16a4eefdea01. 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/QM6P42498549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7d7bf3c6465b24d553cb4dd47466b8ebe85e8d6c88c4ca38a71d34d077ac97. 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/QZ7R42455755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec30d99ff7144004223019281fdd04c295ae8050c796cbe6a3c8783ccf9046f. 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/QZWDW2437463.