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 0x660f764ed830c29a12a6db506bbfe130484c4d7f6ca027755fa166dbb4ab3513. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6c6a95b2-1f13-4e36-a652-1bbd938cb9c8.json and https://artists.proofprofile.net/proofs/artist/6c6a95b2-1f13-4e36-a652-1bbd938cb9c8.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 0x355c0b6a393341d638d1bde30b8579adb69eeddbacb800304175a381f3865fae. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZWFL2476480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d6dfcca32bd873196027bac2e6a01b042daf5c97c97f77372cc36579f3e0a7. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZWFM2446358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe150a3bef9c54a7117a2daf773eabde798236c6ca8f372d48c7b1a2fdbddafc. 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/QZWFP2412258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd00916c249168247d65f8998a8d051fb8ef0ca7ae7e7f46c85551537941cd3. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZWFQ2469720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208ecd582cc07312a0edb18667619edc376c85de00e8592a92e7ba3acc9d70dc. 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/QZWFT2449326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf8a936df2e26bf16eff0ab5216557a1feadabd76574d391ff78309e09de1bb. 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/QZWFV2489648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c57ed42fd338feb78ae44036198944f6ec3beea75abac39011d76eba4c2c6e. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZWFX2471020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b608d6a5eb4b46874cced7b7966fde07adc4de67cf01fc3e441502a96a6085e. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZZ7U2469501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12693e4ed86ddf45a1770b8fc427062d6b5783107ff746adc187745a234acb96. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZFYX2578370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06f0fbbda77bab08c42215330812a33f55fe293b87da6217c444a72df4965aa. 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/QZFYY2549604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb926b27ccb4c0163f6251b9cdcda5ac0456dc0fe8402e33eb6e15cef79bc9a45. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZDA52506770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba024d0528085b79bf044286edb8bdaad46d3e4451c2fbe2346d1aaaeec6057. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZES52593377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb980971a28c635578d760a1ac9658766e93670f07101fcf7bbc7fdbda206105d. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZES82542437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40fec0177326f6a2b124c3cf73e4b6b405dba95fa39b20f2bd4af1e484c9750. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZK6P2568019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5c7aaa61aa1c5301f51a19c80bf9fc927797315e5dd2841290626ecf88d545. 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/QZMEN2554464.