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 0x431c73702546e1c965276ea1e81e3312b921420ed2653d71e19c746918a85b80. 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/52471a4d-3e73-4e22-a04a-2d66ccfeccfe.json and https://artists.proofprofile.net/proofs/artist/52471a4d-3e73-4e22-a04a-2d66ccfeccfe.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 0x898e807df1e5c093f9fd43a8cc332c585c3f6ae6770d3429e481140aae7c0417. 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/QM4Y91500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44718a3cc06da8f16a6716161e0ad97acba51fe5d67f0df035a6b9491711d9cb. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/GB8KE1954907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9867ba33c7b3df9658782542a3887152929dbb88371a859e5c81fe96c48e2c. 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/GBKQU2051554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62ae8a6603a4b595b40ab5a1fc15583b9716aa78cd65df0d64992e33903ebab. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/GB8KE2411200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f77a4ff0dd6c14da52ff3f55e51707766d67f2bd04121daf0bb816b6ac677b9. 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/GB8KE2411201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb49f094a1ab69f622f69d3eb7536c3ec209c94baecb97cf06ab39993714860f. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/GBKQU2458152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ae44b79969de772dbea9a1112ea387c5e3d8b47657202a26b4bfeb33f3589f. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/FRDX62408800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87b803ab4004222b72cf7eb6b724275f79d2886a663f76488afc6f84175cec9. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QM42K2521107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803072f83a0efb8757c2fe11c69f014844d7b0dc12e1d3409807447257340ccd. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZMHM2551113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4239edb588f19f7dde4de4ac249d2dc8edef765bce323eb0432024b6d9b0288f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM42K2579958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5fd5b3d3dd33329da2d8e059d55fb120f036daf7122997583589a0851b9270. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZMHP2540198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbf79a071a8dc6752d4076a97b767cb9c8c8e626acbbbe360f5d3c4bbca6d82. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBKQU2595723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a132ea13ef36c382e66b50a346d6fe7cde098ab2252cc9d1b6372fa5f6ecd9e. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T07:27:06Z), 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/GBKQU2595724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826c7ed12df65985f44c38a647bd4a3ac324154b3643d38fca447ba4394785a7. 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/GBKQU2595725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186146f3e54852f11f2a826091b49018c007a663316e781dc0103ec1c1bfb8f6. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBKQU2595726.