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 0x8bc01964ed6dcb0af39b37b4b4f531cff214938f3de07924d3a420abb69eb576. 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/6b7165c6-b7ad-4144-bad9-2ed6fef46d0a.json and https://artists.proofprofile.net/proofs/artist/6b7165c6-b7ad-4144-bad9-2ed6fef46d0a.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 0x91d4f440d38c94c14e65464eb49e9d22d0e27171e3d3049459f7d95db2f3e05f. 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/BX4IU2202852.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6742159aff8e7b27b0f14b2c62923a20ecabfc78363e6177c5496a463c3bb61c. 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/BX4IU2302241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d3784338af1a1ce835f40b24a4928eab1341a41f420b8ed4ec8cca5cac2e44. 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/BX4IU2302246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e55b00b676d78edd98dfea10dc887b934c006c9c6baaca2abd7b8dfb8c5fbbf. 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/BX4IU2305441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa307c8537a9193dc3cf2edd324829f5c90c64bae6b7d8b323b1e10279d846e8. 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/BX4IU2316480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69084f9d838d067cadf327f3ebfff47290c57381c64fe7d3db24721a3595e80d. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/BX4IU2332797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905f78729a8b2571bb06c1d2d0d3cb8f9be90b1210d99a1417a39a3bc21c874c. 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/BX4IU2340831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91009772e211c7a48b076c6ba130fa1f799be59c026749401e630b739c224042. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/BX4IU2347666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7abc938ad88e9de2022d4ae44b7369924ac24f1e6a71d7aceafa38702c86e3. 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/US3DF2401058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f0e3b0e6521063402b061f18d25347b7f698e9d96d13ab2fc7b1dabbb44c19. 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/US3DF2402814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad030f8b9cb04c8c9e09f3220f68adcbb4d1c40a1e901423855486acdca17ccc. 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/US3DF2415494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8bfaeba9fadff83cb118a16b4e121d07b5d2c467e243fc6e24fc54805cc809. 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/US3DF2447886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68541eee246d57720ae12fe16edbb4fb3782c29c532144a6d249dd74c3c4654c. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/US3DF2453809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd965f27655235f3fda980adb055f6ba4daaed56c3055a0ec018edbcc676bd267. 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/US3DF2473959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59f98a401b9bf6dd43fd805955b1d1f74bc273f91d50a529296f8e45fec5a7f. 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/USANG2425429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba0d6da683f3d5f21ccab72adb1e0d48f31e74717eda717c44ce38d01f60e6f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USANG2430203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a413139fea169c023c2f652b57bd6239c7145d019a9d6b9c6d0cc162779e353. 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/BK2ZD2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f37e848972f89c76b7bc5fbfb86f10b4ed4591888fe65eb09898294d2810f6e. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USANG2464191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf0a8fa89c7e3c9969278a09e9350f9d53a316e71948d79029bb2b0f1c26888. 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/US3DF2501662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f375c0b563bceed02231038d01aeb2beaf16f5d7b4b820acf2138f5416dddc. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/BKWDJ2500060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8420ae18d7dcf2892634dcbc7302ad16c0e0fd65a61bcd95fdb1d0e9c86623. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/BKTKU2500673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656d21aad0fdbea8040cab99cd10e4e19cbe32e4d6eed3c8f05d024e7ed1f8ef. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QT6E52588513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21cc4904f62a812ae5ef8b3581c2974b1a8de0987c6364e5676291770b385d7c. 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/BC66P2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a67009107e9ddb087ae8c5ce08f18d78a852e9f00910c8ec9d8c0c7932eea6. 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/BX4IU2353576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfced73cdcc2cd4ea3b79a922f4412b41f3231f2519bc8c8d01576006cf28fda0. 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/BKSAI2300187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b501c68a44842a4d315f2b2ad56f40b0a544ab7bdbb62eaf4eba8050c2748df. 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/US3DF2460368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f9c968feaa6ac88bacb8ad7abc26c590aa5f6393ba45b6c3d9253421281404. 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/BK1P72400037.