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 0x99fe7c0066f13cad5629a4ddcb44e666d266423b9306a89299b71c399a2f739e. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c8202790-90cc-476e-a43d-a9171cbe05ca.json and https://artists.proofprofile.net/proofs/artist/c8202790-90cc-476e-a43d-a9171cbe05ca.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 0x14d7a6448d295816b66ccb26fec7ed8925a0637f7f5882989dd3aa74bc12eefd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN62446862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb597b8c5a0ccd2ba188b7f376d7f6c8bf9e986a14a27598e8eb0f1bd822a772c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWR2257503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffca6cee10b125ab0538e7d41b8415df2cb6160a6122595ae28b8cc83f5736cc. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZNWR2257504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5fc45e44b5287e6e3997d2a50223dcf7e43304ccba2efe523ae35b59ae585e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZNWR2257505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7beaea3dc5c96193690efd98313008b38763ffa2d72c54537a9eecaf00a13fc9. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZFZ72453736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92dbdfc495bd512564f55fe7be960471d53fcc7ce9fa59e1e6ba8a3ef1051bad. 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/QZFZ72453737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895d84331689f21c470fa8b867ce780c1af170927598c72091d3a036c58ffd0e. 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/QZES52347405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43e6d11b7b65127867abff368cd8a793413bd5521a0f2402fa785425ac7c4dd. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFZ72453738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca5ed3603ba4bb81c316dca6f581337c89f528833083680683b9aac60597ddd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ72453740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0d4d674f2ec827ff0bace20415ba9443a6f6f0cefd7e6ef6e042614acaeb04. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFZ72453741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aab4d05652e6af7d05239538b3a169e0cd4d7f100b3cbe12be77d90d15794ae. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZFZ72453745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf2551c734a8d6f95879f08f0e487cf42bf4ecb43ce77aa279c0298c76a2e48. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ72453746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b16369d763e4b6505546c7dff03485983d1d0ac70d227e75f24d11cf7d294b5. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZFYX2306365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85da11a1789f676e082f91403c8537ab4a6a167f845533c7c773c647a107b95. 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/QZFZ72453747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59921bf4478dcc532fac6c0e1df1057e9ddf7aa858b0505f144e7f8ee80d5f06. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZK6H2191697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895d84331689f21c470fa8b867ce780c1af170927598c72091d3a036c58ffd0e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES52347405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876e371ce787a2763d1924ab27f234780a01a7a778c799e12e67ef34fe9e9724. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHNA2158568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c229d32dce6cd44aedf0cb1003c7975f77da74bc9b9144b4b530d4490b0eb3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZWFT2476010.