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 0x5d6d4f0a6ca345f2ad057451349dc3c6be8f0d585018963fe5bc4cefd9bac344. 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/635a1110-6202-46a1-82cd-e2c6d82b7b86.json and https://artists.proofprofile.net/proofs/artist/635a1110-6202-46a1-82cd-e2c6d82b7b86.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 0x3e1f4c7cfd2d165e6d6eedafdec95c4acd4134fe4ad36bdefbd49bf5e0419c90. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6L2099682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43281605f438dd9173b877fe070415af38c3bc27cd50f7939d75df972be8c1b9. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZK6L2099687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dd1568b677651b151fc99fd7803604a292d88109096348fee4e60d8f123633. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZK6L2098641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20460ecd717cbf013adff08b5fb311426b7940a5a27a8011f9c74eddf73ebb66. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZK6K2000542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddde22c15d4ec4fb96b3e4be43d1d4860cca3863f971253cfb7e4dfa3aab2c04. 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/QZNWR2097857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03c4748ec817b588e4c996189f050b78ba8f61e9fe46e79040297cf1775e7b2. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZNWR2097859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc06fd73177505ada400af72e043af6c6c1755972b69b1e5b4421c5730dbfe79. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZRP52267171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4073ecba0dcf5fe755edc75e39306622a5382f0b08d2e25ea45bb024a8cdc1bd. 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/QZRP52267173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060d3122e3cb918bf3394179ef90aa8ead24bacaf3ad485c13dac5b7e03e1ec4. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZRP52267175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68bac8da6be5fef7cda3f86c7983151cd95b8c061f330a4be98e8d266b46605e. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZTBD2354564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669149633d64ecb86123251cd925df4548f448935d44f37e765b4bfa859c6494. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZTBD2354565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801558366a9fd3622eae0f148804c8ff21c245970a2a3d4849a9e9b82ea1ad8b. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZTBD2354568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bd1e71ee1be7d772bcafc32518c9cfe7bd3bf2eb31ce6ecc17c4251300f587. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTBD2354569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097bb4888f849f4857be14482332badff7574583f63f7d533dce84cc8aa8bbb7. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZFZ72442945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d532c33c9c00de0551bda45ca9ac762ca5b6c60489d0b3dda3a0a8b87ba0a49. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZWFN2424072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43008bd4d54cdb6f549f3e661500997b29de6fe7c5f7bce0ac756ed994eb572. 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/QZWFN2424075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5478c119af1960a9c400ed24c9fae59687557fac6a1a61fea9fdcd080c0400ef. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZK6N2546842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156d153fa2a128bf8b38e95ee947f978693974e199c0d55e1466e04e54a06de9. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QT3F62520444.