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 0x25ed7d0e6b7eb69e5da8bbf50b5a64aec3addb31dd55a9111494949a0d05a711. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2fb3276-dd26-4a40-ac48-10476b35659a.json and https://artists.proofprofile.net/proofs/artist/c2fb3276-dd26-4a40-ac48-10476b35659a.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 0xe1654abddc82f2feedeff881e909ac0c6ee4ee357b57e888162d98b7c117494f. 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/US3DF2236845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e410fe7235ea4d03edc3bac45f5f76c2bd3150dc61f90073211bdf7bc768de. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USANG2189089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac23b4bd010c1659fc7628881ef81e2029d368eef388f7b96fb5fc343f6f3b99. 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/QM3DF2120033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb917f3508168f9c100695a9a3d1e7a8970a9253bbaf175492f6643807e3c554. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/US3DF2214865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10254b74ffe4a2478e0faaf65e8e314d3c9025f2388cdcb67a9091e14fc6f034. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMGR32165388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d27012aa592ab2c8f3dd5fbaebd548fcf8d3543a4c3766cf781d6e2053d004. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QM6N22096631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9afde66a5c1cf226405af0c4793f61761c4410b63dabf8aba93f9e91f98e5780. 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/US3DF2266294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f05cd750dd2476665c494fc93ed5c7270850e16bbf5e444e71913698ffef01. 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/US3DF2152510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f65f00f3a4c1707cb6ee3ee76640947ee3a58cd7516e0243a155c8853098e59. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCADZ1808020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe095ad3765f7baec53605bf34b6724e6df593f468b1b0d7ce7bbad5c306f51ae. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/TCADZ1808022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bedbf4f621dea0f8e8f9e0852fc7717faa69b5f9142eb81cb19326ab14bb9b2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZHN82438917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba9831ce64b9ac8b1358375448c663c7db8adb2ef67548dca0f611a80268cf1. 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/QM3DF2478673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da2de50da9a221ca771c431f1cc6470fa6aaf2e356e4acb7591b5da9551aa4e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/US3DF2415053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234fad2169ea41315c45b1b72a70897b5d7f771e6a7b93dd703dafec5f70a3db. 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/QM3DF2277151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda00d222c399739f758761436eda1217648659780e45080c9166af34ac077ff. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM3DF2272593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470d4fef77ee1173fbc3eb347e1183fe32d0d27252eeb66027c0f732116ad52b. 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/USANG2290877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb917f3508168f9c100695a9a3d1e7a8970a9253bbaf175492f6643807e3c554. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/US3DF2214865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac23b4bd010c1659fc7628881ef81e2029d368eef388f7b96fb5fc343f6f3b99. 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/QM3DF2120033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f05cd750dd2476665c494fc93ed5c7270850e16bbf5e444e71913698ffef01. 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/US3DF2152510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e410fe7235ea4d03edc3bac45f5f76c2bd3150dc61f90073211bdf7bc768de. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USANG2189089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48a0438e1efaec03283c0abeb0b958d0fb98049e630c30c382d45329b3128b9. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QMGR32155406.