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 0x421f6d4f476ef84eb8aff4424d111621526d84205e79e2ccf3300e0cf2ba4468. 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/46e1efc7-d91b-4e79-baa2-736956bad3c1.json and https://artists.proofprofile.net/proofs/artist/46e1efc7-d91b-4e79-baa2-736956bad3c1.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 0x77542fda06e7e2385d7e94e57a49cef03b947779a28123e840d3312bede12300. Chain 2 (Bitcoin): anchored in block 957834 (2026-07-13T09:42:16Z), 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/CH7812214431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf799c5d84a4e6abb6278f129f5489f4463fe9c1c37dd20e2da2ef13b57078f3. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CH7812230919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3258ac91b57fb4ece5e0f6950e361836e3b66f6c7a4e6ae099a8c1eff65b937. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CH7812234377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ab7487cd93d3888dbdfeda8c41527dabc1e928e0a85b256f9eeab605ec7727. 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/CH7812354096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41b11ec345fdbfb5a17838625802e08c156da34235fc1ebfcc404b47899ed99. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CH7812354098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a74477a3ae5bf47d9994023bb4728eea4658fe5a81b35c8485cb6e9e1ebd0c. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/CH7812354099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b14423cb74a212a067b20dda23c8127d5b527dce21f92fad38cec8dca3e6e6b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CH7812414091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547dd14a6c013cab090b65d15468eafdaf876479e1f8814da648682313f609d2. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/CH7812409140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77542fda06e7e2385d7e94e57a49cef03b947779a28123e840d3312bede12300. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/CH7812214431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37796b8d447999b3de2ec5655a2ec689de9664043ed2c3318df5a1fd79778471. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CH7812422160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16effb14a49a7ba4cccaef286f9ff9bc2dbc15eb82e17a63f430bd866bbb8ec0. 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/CH7812530430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf399be5a25b7033e5ff92f9d2f4aa3ee87e768379a5da00d4e20a552cbb91d73. 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/CH7812537075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f2666745dd3fe4fa25fa93e07d85e8c37a96f3202c2910056499dd8b757559. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/CH7812542697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b397713009652be2ae09981d2a20a216abd22583b2cd54837c46fd5a87e5760. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/CH7812547768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c63be143fd4ed38c8bd38c8b4a15a1a51ea12925b6d2adc5b80fab3cfad83fe. 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/CH7812550617.