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 0x47cef629f22f5ac60ba7123e11db641be6140f497305350638d09d7150f13329. 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/b2a9e8a6-bd07-429d-bb0e-553e20995460.json and https://artists.proofprofile.net/proofs/artist/b2a9e8a6-bd07-429d-bb0e-553e20995460.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 0x76936468029eff90063bbe69143bf1de89f1d025712a90b40997c4fab3b32f11. 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/QZS662480323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4259ffa7c955885c654a1aff17de63d7eaf93053ec4db3b382429b7a7c9bd2. 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/QZMHL2499179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223ac837725905c70303d696d34a9413869435ba0d54f4e7078a90b7aaa43b91. 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/QZMHP2416905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167a1f5c848d1ce95f33ae616f37ee6d25da14302e3f042b3ac96b34a3957de9. 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/QZMHK2483803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c83244583ca06a13363e6c6e1739d98ce8fad80f4e4085f421e1490ce7e0e67. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QM42K2473073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79865e7e515b988cc298b26e17ebbd90456b2191a296e274cc968acdaa670d2a. 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/QZMHM2480278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2e8430d93a330dc98f967e9f6ef5b65cd137b12c3e69a6db7f6d9f88cd48f0. 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/QZMHM2408795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555a30b0a2cbddf4812b9a0474801598f7eb3636bb0e4a1943215f49d565d709. 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/QZMHP2413892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d805b5a2514e668445f3b87715bfd3d8b150cfbd5f4ec0f28036e8210747767. 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/QZS642483384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61de6aecef7d4df8a31cd1c2d8834f82045d2350d2b4f0dedd78cbb35d68309d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZS642423318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8d6be51002791a051a1c95a2f58ec4b406194c90cf8e63498086726fdf5483. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZS652461572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21ce1935e31bccff78f5ce54a35db22c77c059fa4de11482613df88e9c0e4f4. 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/QZMHN2468448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca576ea6be6b8e3ee42988351cb27b8dd0e010e6536728a7aab27d95986e2b3. 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/QZMHL2426795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39e599954ff2eb56b53e168b773c958f0228d9b293b4cc10e0722e84f1f8fc5. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZS642466121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c5f8cbb71e0e7c1958d0f28e97909c12e4050d0a0635449cb5bb9a9a4383fd. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZS642415492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86e9c6b8f966d80d669f368a8c793b14bc6b13aaa00e04ae4ead4d9b26b5e6f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZS672447923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90410620598d0c2e4f3a23122e1a8b246d6fc302f77fef36c85c8de424fecf7. 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/QZMHP2439470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8d16cbb719a6f6dc1ab54939d40c68b1c651a9a0476488c80bc42ae2ea97ea. 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/QZDA72555755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9ca23a68b0608989dbb3f59df89f54a2f5c35d102b0f1de3a1d1606bc78267. 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/QZDA72555756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71eff428be9095e1aecd953e2b207e025023ff8d3d6fb3dafb7fca9dd18d3b57. 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/QZDA72555757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942639787824ae5b823fb5255b071c705391f13d7b63d59fa7cc611bb4d54d52. 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/QZDA72555758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df47e8bf84cfb776890d5d4589ee8ed9724261fa0dc536eaf8e33335e96fbfd. 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/QZDA72555759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb32317efefed041c96df87e9f230dea74e19ed27be7c929fce74abc3f196802. 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/QZDA72555760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edaa56d69f502aa0acf4d41f1fe2af76d208c21ee3ecaa9d429314c1b1cf612. 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/QZDA72555761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19094859c4676869030bb5892d8a76aeb700b70cabeef4fd9a0c18a7db4c4d5. 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/QZDA72555762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722f40a080ef6dba7d1c5ffad3e91df7a307ff0b0ae7da3b64e2c8c7a591e8ae. 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/QZDA72555763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252802803f81788b8a2772c827fcf96132782756278f8b9d5b0237ffe02f738e. 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/QZDA72555764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383e9a30fee1204142c6982fe8fe80944a4b1e0a111df1fa02fb28b19b475e5c. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZES92533773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687fdad5002509efbe2049beb311e246c5c737b02aace014fc4c13c1fcff3a76. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZK6Q2566336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf615e2888b803de1c29b625b99ae1037d5ca056b9cc34fd4d5978d9032cedde8. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTB72510580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7367c6524355296135434ad1c48ab948ad00ed6e642d697d6c4075ad2320713f. 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/QZS652495141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ebc1e2e9dfef3c0c535557b686246363588274e1ba4efeef194cd36f8f75876. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZS632421419.