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 0x18da5e97fc1c4a4be94fa552fd11dfe65e0c9f78498645dd7ae83e8be96fcc81. 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/5a1403ec-9595-43b9-92a9-3a4222ddca52.json and https://artists.proofprofile.net/proofs/artist/5a1403ec-9595-43b9-92a9-3a4222ddca52.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 0xe5a0ba041cf956ad55cb85b4aa3679f6989a79f39f144e2f6ecfc8ecc79d7417. 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/QZ4JJ1773724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369f5af874652f4e4d3b77ad423279fa84c13faa3987d48f80a291a970570755. 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/QZ4JJ1773725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68c4d43b84ad1259ab7e0a04275e16089870def2966be02614c303fb6eeb4b7. 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/QZ4JJ1773726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a3082be5ee6966cc75d9a8b269f851404ee33ba3081bcf59add516cfdb1ad8. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZ4JJ1773727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af03fa91d78254c2777dd4b73966302dce1b92dae223d1cc1c70fc91fea576a. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZ4JJ1773728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876c6019411f622fdf7bbc1ff2789c0842ff3d9104ba9b64b41941420cd66b12. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZ4JJ1773729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6256dc11ae0fa1e4978b6c3529f7154165804985ff7bbcd1098705c858952bc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZ4JJ1773730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425f5e994f6c3c9affe903cb35293051c03fac137cbbd6ea2148105dfe4025a4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZ4JJ1773731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b291cfad8e88d140eb06c8d43803805bd659da796d75ef72c8e3c18f1aff593. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZ4JJ1773732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86127c6c01c009aae492b968ff47687fdb668f8956905546574bf51b46903d8d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZ4JJ1773733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53c0233d00a895534ca7688afc76f0bec2f08bc0eb7554547351ee56ea79081. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZ9Y21778334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50789e438f8218d655594487769c677bd6f7ca4e6d50b112e05b1ec5f9a346e2. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZAPG1840961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8859196b4412c89d21768de6cbcc7de8849f4cec160b82fb7d64d852ee31ad. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/GBKPL1955204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f9373e385886825f5d6de1c00feb4256431a41f3cbaa137ad899157340fe3c. 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/QZFZ71982040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc070cf27d963c363c27920d5cffad83998ae9b358058b4ac936c11ed3700bc14. 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/QZK6L2039784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5869d7ee764e0b1c0643c519191d322206f0c451717b8fc55997b2d458fcfe1d. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/US3DF2498211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc804980b922c2cfbbea9ae2bc85b1e7f9f06aa38d8b5c399dfbae5aac01b23e1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMFME2162645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f0fd295efd94dbd9780d43975943365808476c0d77f839960c42c2b743dc53. 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/QZNJV2172821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c2ed812486f8810e64fc9583ca1b471693cb35e9058df566ffafadf38ccc2c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZW9K2277340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc804980b922c2cfbbea9ae2bc85b1e7f9f06aa38d8b5c399dfbae5aac01b23e1. 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/QMFME2162645.