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 0xe1da244d3e7a9ee1c767b9299e897356f063ee782378f368bde8a04d351dfd74. Chain 2 (Bitcoin): anchored in block 953706 (2026-06-14T23:14:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cb3d8cc-fe32-405a-a5d7-892adb11a455.json and https://artists.proofprofile.net/proofs/artist/7cb3d8cc-fe32-405a-a5d7-892adb11a455.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 0x0ed097e01975569441dbc3cbac4da5f711ae5bb404249234a31ffd0ff0a9fc9f. 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/TCAGE2235616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8946dd0769b77af928dfd4942848e3c22fa05c464ad24dd835ae17b83b6bd10d. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/TCAGE2235618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf3b005859703880a53bb26601f09b232f606bce17924d9ae4c7ea62ca8a432. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAGE2235621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1f244565c14d92649f8d7012eaee16b16f7d236437711f09bdfeaa9a997bd3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAGE2235628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16c8630c2fec49b30236646a7398a0bd4ce821d48df987c37e3fe9d3f90e71f. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/TCAGF2245943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a65cc9c226fa617ec0df3213c32d74029dc040260be4d6a87c43002fe74e74. 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/TCAGI2271473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4306750ef1682724fc8eb23d2d581d9d6e1853bcf5c3b1555dae933bd64d0d7d. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/TCAGI2271477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0d9ba830ecc484ff323af7a13be0dee42d5f3f8398b18f0d0cb80a7c2b0998. 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/TCAGI2271487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e7ec939aca2ab1627b66befd19bbcaba7f37e8249f5d7d0ec174bc4d534794. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/TCAGI2271492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22acfc159f3d98c35575a7e691b35f70e6b23df05702f76c624301e47fcf7838. 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/TCAGI2271503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7eb12437b365ad4eb8728ca39debc91cb42b3e0d464dfd00500e4ee0b467d9a. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/TCAGO2209700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa90eaf19a2fc416d1ba58e8e48aa290c73034ed82da7bc1d3949400de2d059. 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/TCAGO2209710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860dab4ea7766a42ea167554ff0516cc378a76fd0ddd9585af71bba4d7d2a099. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAGO2299233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eba098454316f353ded208a8b287e9a9f4494831744eeedea037f64e13698f8. 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/TCAGO2299343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b7d8d01a18bc79dfa81727df6112794249f441ee05aa334270470ca73c8037. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/TCAGO2299356.