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 0x8fcce0c360e1acf427e0625a3b11636387028201b997e6a26afd38af8ab2ae55. 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/36187967-4bce-4059-b03a-c90054d7b5e7.json and https://artists.proofprofile.net/proofs/artist/36187967-4bce-4059-b03a-c90054d7b5e7.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 0x13bd2bda14c1364647aadda0e0535cd3221516a453ac721c1782658eaef3e256. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TWF710700068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8f279dc748a875b554f86f0a2105a520d3cea96c2c020d8161f0408f34e721. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HKG732235833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999e2fec05067766e2f9f3b9ab0336bcc916c0c848cba09d59eb68b13c8c96ff. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:05:04Z), 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/HKG732235530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab80c828f6ef6248b0ca40db414c57e8152ae91f75a7bcdd705ea879dd101f6. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/HKG732235531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda35289b31a7f4bcd152c46b3b079f7918a2dfd58a426d907219ae88304e5119. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:45:53Z), 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/HKG732235532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11caaa940cd161bc92bbaac8ac11ee67019ee8a071f032a7f57398993d4ce88. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TWEH71800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29372ec1c5153766adf3619372532b05cf90420a8d133cee214cba632ca050c. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:31:19Z), 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/TWEH71800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ccd42bd458be61b6871eb0beaab7c111a43c4cc66cedebe5e8852189b18d557. 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/TWEH71800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5ed992f2ca6e1c2e4b7ef4ba90bfbe424f735d5f1026563ad2ab256ead5e36. 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/TWU712001736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5199dd5ce2309f8a2a1473871c795f980185d80d3d940357dce9863b510557f4. 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/TWU712001738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c9e2fad171308b276d7752f0e4ef3361e0eabf1933bcf4866a1600fc9a81fa. 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/TWU712001750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5c90849ee656a5d7e5ef5d8e4bc97f6182f1325241eee1373fa67f5a432815. 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/TWU712102458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e369854a20582b05154e18ce45ad6a647cce17c6c21724edd2321446e4537e. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TWU712104374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebbf5d01e40dce7a9748ae8e0ab605d81d1d7cdc4dda60ed00e1828b1b9915d. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TWU712202538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e69b930275b090173d0dc6ee8fe6e5a1608cfe0e219c312e4794d0050388ee3. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/HKG732511492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ec0777576237f6abfe6f1de0e77a48796f749d0fd2126fe44e84deab1a4e6b. 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/HKG732292592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964971f27cee86ab6501b7a7f8b2875f4edf8ba7002eeea69f3f72d459e4d4c2. 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/HKG732292589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae51f8c23ab37e18c23185a72e69ab45a28417799ba5e62c400c389a2ac8a80. 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/HKG732288418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d02453a1320fe4ac3b9a0a116b9c670c018cab3e038098d70e2c9208a9a536. 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/HKG732288419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62a0c4a711db50f43abf68d583910ba425dda3fb690c188ac9ae8ca0910b689. 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/HKG732292682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fbccb2bceb55e4d6f53a0f664b600405f281599628821c3435c8c207a0a30c. 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/HKG732292690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4692687694a1887d36783ab1361ba157f4e12f6c7f2a20f1bb9de987f21ffd88. 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/HKG732292684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987d20120a33d1e7dceb2f986c3d6fd52fcae558fa32247d7337e795178aecda. 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/HKG732292691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcaf2e182bee4c92d0acf7f2edcb7e854276f4c2d6e9e8e280e9186c2700351. 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/HKG732288410.