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 0x245175217d5c573e02daf01021a9df3b00d54a9215eba84b08ed10f57d102264. 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/e8b864bd-2d94-4b42-84b8-c82881c1c939.json and https://artists.proofprofile.net/proofs/artist/e8b864bd-2d94-4b42-84b8-c82881c1c939.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 0xb0fa01c966e1dae7323a740ca656f55bac3959c604c3c1e686e387f781e1b8c8. 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/QZTAX2404181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f30eda91a734ce3fbd8b8295b5c5af4f87fb06f3c6fb5714dad15a582e99ccf. 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/QZTAX2404182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32495c396c6737a2c93aac5154f18dc0788da60cbce43d6e7b2a35b9a9a7a98. 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/QZTAX2404184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf43f64f6d439de41dfe2ce4b8478e44d4836e8ef161c0e2f376d51bdb9d9924. 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/QZTAX2404189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966cd5ab36d57a2c76e273b81f9c6ffacf7c11192410dfd1a7aef8d64ba6306a. 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/NOHLX2460060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3232359fde3e7be81051a9a920d3cdb42b2d0cf8652e53643d5243b61b4e878. 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/NOHLX2460020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3896e2f49a452bbcf0aa22721c70272a4a0ae2b3c801bc634f62c7b0c73ad7e9. 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/NOHLX2460030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabafcf479ed988e4dd1992dab1d2461ee5de2725afc6fbc50e336957f84b59ca. 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/NOHLX2460040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a1f9192849d3adecafc5eee2470b07f51695620e896bb3de7f28e56ecc5398. 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/NOHLX2460050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2eb913908c337b7a7790a9f23575a1e50474c7afd285a7d09d71e716bcf50b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:45:16Z), 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/NOHLX2460070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d09e85f97070c8c9a1735e9a1dcee51508af02dbf2f794ba1a62489904c6c74. 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/NOHLX2460080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f063f8f4c1d72e9bd958f48c1e3e804404ed18ccc5c95a849886bae2caf07e5. 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/NOHLX2460090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0482586c0e869258ef38a7f6ba6d608cc54c446ca218d614159ef6926d5b8e1c. 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/NOHLX2460100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce02a504ebc147e0cab9e5d2adc08e13b3d70a3b7b72a280168f198b4b4b48d1. 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/NOHLX2460110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc408cb37d416fa16cec7bc8df862bdadf743c8655bf52f36ee4d603f56bbb25. 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/NOHLX2460120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ea7784e5a8609524bb08c2d4c0ca3c1cb51a798d042487b9b06e51a31f2ae8. 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/NOHLX2460140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f063f8f4c1d72e9bd958f48c1e3e804404ed18ccc5c95a849886bae2caf07e5. 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/NOHLX2460090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc545d51205b684fcbd94c9740c756f6cf6dbdb0d994cf0412cedd8e9564d1719. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NO4DU2205040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244109699fd17f26884e3052a131d61de7104e9d3c8c8c91d08bf3be9471e261. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NO4DU2205060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e1795bc49b6aeab4e1267f4704ea1cd7bfb49aa3a0040ef14b91e6d7047c28. 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/QZHN42539362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21e8c47bf9c17ecab7a63d3e1ec91e2b8130720bc5e1b986c34d3662868d3ba. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZZ7P2482477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b60a319f557e0c45ba3b10190a5a3c682c0ebe176f709d86677e14dbbf47757. 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/QZTAT2422933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1368ff81504946a68e49a4752ec0ff96c50e477c977dd33f442e06bc0f509f4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6N2420902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142d52beffb2e81b08727245345bb2108cab4fe75432fd6fff748751b29c289d. 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/NOHLX2385140.