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 0x8507ce53edf3b3fe936ab834750005b0ce5a8be4de31633df01c17416d7deea8. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/166ba8bf-26c3-41d4-9365-b16358e289d8.json and https://artists.proofprofile.net/proofs/artist/166ba8bf-26c3-41d4-9365-b16358e289d8.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 0x0575109b702670d358d719f0845f04949cdac780b8389d456d2906e1e109e0a7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GBSMU7988163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc02950eacdc975b692f20db812c0ec229628ebb791bf78cf4d47c2746e005d1. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/QZFZ62145063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6572f78b3c3dc35054c8ecc32e2fb0dd48f71aeceda95222a826e243bf93e1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZPLS2220565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa875ac9e3c22e0c507ebcb8e217143ffa1e0be34589815430d4d86a069c3d744. 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/QZTAU2224510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62fb6c13c530e2b60e922ff365df6dbf1478f3614886e4ce156ee84a3942ac82. 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/QZTB42261495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e4e8cec345585d4a1622210eb0aad2bf448ff35faf09949952183cfe51dc5f. 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/QZHN32328584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9debe707e55c517fdb7bbadd9c633e94c1f1ed1e46e308a84796e1ac0a27d5. 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/QZMER2375568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4e6abf85168dc5893eb27e518b23ddbb7caf51ef05c7b1d30adc488aa3278b. 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/ARNCG2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104989a58596c973a4a510cec5f7ec11b0493bf5396e03fd7cd809bf0c3c07f0. 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/ARNCG2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e109f2cd0549ac5ece9b69c9c8293b322703f30a69bc1d8aeb79cff72208ac. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QM6MZ2541807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee05b1a7412e393d7a225cb86400d62b08cdcda0233ee9a36b7c3de29f4505c9. 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/QZZ8A2562559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14439761fa9c6590e62e7d71b06e18794fce305cc27cf2c32ad06b3bffd1190. 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/SE66N2321915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0552db1f38ee4894dcc776c921917357e89ef1a460a899fdc392a67cffab5c06. 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/SE66N2269616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae4c17d2ff9c9c0388269b4eaa95a17fad3e8fad955966005429b70cbfdb081. 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/QZHN42431881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e92758c823f9d20f82bf136c698a805f5608ab0b622b263e1849731f210da5a. 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/QZK6N2392798.