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 0x89c00efb9a0c8e6930bdd440c8d9db1892d84c1657318192bc35e569aa3970b8. 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/88f8e841-1ae1-4798-8e61-5883c08b5283.json and https://artists.proofprofile.net/proofs/artist/88f8e841-1ae1-4798-8e61-5883c08b5283.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 0x2958a7be6eb83b43382d43f1f188b199cb964c38a16a6f543206dedb48019169. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGH1787177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a98b9b733a0fa47268fc83743e9a371b8fe88859932516c933748561dbab7d. 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/USCGH1787178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead1bb1d7437f032fb59862c236a5d73e1d75d9563601f5b2d85ee8795c9315c. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USL4Q1842245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cce0abf13dd9b8e34863fd17476755978e74b15362be3cf89fd6b44fef1d156. 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/USL4Q1842249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f85808bb1f180f500d4574b1744b7b4c3666e3609385b7a1592443a7080ba1. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USL4Q1842251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e01bf126e8f53e0cc375e76ffb7ef4e9f5e86d28cec668f765c238776119647. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USL4Q1842254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672510f447ec6f0beea7421954d93767fd6a1f0fc599b8e5923160875fa61203. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZK6P2052314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95aa545e9ff3439c8af0d7a3015c2502ffe429c0207e01b09d1e88844b30d1bf. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USX9P2065775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444d6a9a4563700334c782f39d5296f79d8bf325ddadd7c9b6a442727d763a2a. 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/USY242403765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067ea65e133a019de6bbf8cf15c8e3d08bfbd37cd2c5a52bd8c240ad0cfe8b8d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USY242403766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8816baae6995f23a510ac121d874bde1ae7f410c9733636268d5e27799a5edd1. 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/USY242403767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afda2549ba54a58e3679800bb978b596e3e7bd195830f7c3084beb42e813fdb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USY242403768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cf2503a969cd129e583505293a6f8cbe5701f771cf6397c44cc36e961db9fb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USY242403769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37e61d424d331b6926ab628972b8a698b7ae06c678b455a9f86324f37d1a42a. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/USY242403770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda921db67e71d8b7a7d24deac6d542f383d218863fbddc28a7774551b1f5967d. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZAKB2510507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048ed322a7fb36926c761ae39208a1f4402114ced144ee6a443ddae2034dd657. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCAAY1112312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb170f4815d0cb43baafbc872bb00df0f55bac88509199dec6dfa53b3b39e20a5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCACB1413667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44232e669c1ecc4d9a0ca88e83182900b0d5ba5811bd4656bf70ac5abc89079. 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/TCABK1250777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1365c016fbc32a9f4a9f1660fded3f3336b983b879887798c6cec6664136f306. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCADB1716962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ca47132345be2f1928e3ad8802a32b75cced785ddcaf82a60267fd8531fc5b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZMEQ2034407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b61868b0f043a170de3dcf065e771708e4e3bc9c0a7f4147e38a3ada8d9c685. 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/USUYG1357266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7365ec8db17cf961c9883815bde62f90a0809bcfd7cfb0b0f1e56412c97a484b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZS7J2320869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c27f6dc968abf2a6a5bee0fe4290eb02fbac448a7bbb6ec7e2e93fc40e491f2. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USA2P2307602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cabe27ce962ad7e8708b17c62835487d38feb0f885c059b81b108a1e4c75a10. 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/QZHN62067659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb25f9683257bd16d2f63ffe00f5d77814c982549a219a55b24a0b309d838228. 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/QZFYW1996770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ee5988738e9923357876dd14e6aa2835febf605594bc1eab94b9eca6d5a54b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDA42342892.