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 0xf9d601fcd1c27b57fe44d18b1b5c4728a0c2634956134e2b94f3231bb6b76607. 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/955e196f-e775-4ef3-bde4-9f76a72fce0c.json and https://artists.proofprofile.net/proofs/artist/955e196f-e775-4ef3-bde4-9f76a72fce0c.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 0x138e0bfddc3cb794c4a90bc2225a394790bd658c3f9826ea5c512b50ea789e59. 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/QZPLR2557466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ccb89709450ee5f1f98f880d5a83200f639d9f9c3844258fd0f41d02a86743. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZPLR2597076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123f5538d7c12728552bc8a7bf21e07425d263b3ac0cdb094e75749a24b156a5. 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/QZPLR2598830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05608ae2791f648c0dad3c2a55e9043dcd00d68c0aab0bddc55ebceb2228a5b9. 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/QZRP42521421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df3f82bb98a8c41da96eb51ef909f64f57c540cf4fdbb793439e666b41d3f09. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZRP42522769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48faef5da693ef42d4922b01ff596bf96f2ef72dcb95ac3911f3f88a97a355cb. 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/QZRP42568732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9433b6fc5289556ca7203b5d5d635d6347211217c0b9cb8ae0ba0d547a8fbf. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZRP52513635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6741c39550f1fd08416dc5f7758fbfa415515051249133cd175528518d653b2. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZRP52585634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d2a1c1aca7c18f0eddb40a63faafeea30a4535ba8872340ae383e997dd713c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZRP52588111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8499f4a991ed807976abf4b4eb45193136e2368c3099a6a8fc86ea34974aca65. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTAS2525461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b46a6903ee80bfc147f20701cc594240d67c18f6c0949c210c7cb1f00f9fa41. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZTAS2527577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f99f0d432bfb73715c7ceb15ca2772bbdc15365fd50028e5cb520e2fe357c0c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTAT2533853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf56cd8c4116a605ef764c22e0c2d99d85465155c79d08574d9c36ab7e7c139. 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/QZTAT2535770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f6024356492f202564e108f61be6c01ef1b9e862f528436c57810b832813ea. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTAU2507454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a9e223b089ab32ef587e7492dcb5b803feffade0bb5b2bb70b6779b1fcbeb7. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTAU2505884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a9a7f650a9c962dabe306a67e9c3e62d5dae3215ec0a766aa40544fcb496a8. 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/QZTAU2522334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f67c9e5eedbfa22ec80db892c4b2cfd7ca229b9e906f6b9207f5d90fc33540d. 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/QZTAU2520787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e588d219f99365b9f37144ae7480ebe9d17f8b3d0a469d05faf115e6e721485. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTAU2575829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d678792e61f7e729c912914cf48005432648a9d3794caef4e9ab2a5a4ec7c2. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZTAU2574655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1981884357ecb05654e9e13ac3b3a761dc6cbb0a49c6ba885c74acf7bf5db2. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZTAW2548412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae33770be63f7f61a74a92286534a78b5bd90cc8b604812dec4c3a8f1e984635. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTAX2563025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6d5714cebf94de91c3663981535aeb742b2cdacc166ed2ab09323dbb1bf6e1. 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/QZTAY2505211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02c44d2be6bda59bdd38b157798ac7605524b2a77e2897ab0411a0f55799711. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZTAY2507277.