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 0x2bd65e229e381b8f463c1b0f60a8129f120eb91ed4c4228d72113dbbed91e116. 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/9e187f0a-0a05-48b5-9d16-2a77e55295af.json and https://artists.proofprofile.net/proofs/artist/9e187f0a-0a05-48b5-9d16-2a77e55295af.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 0x1bbe4ef0bfac2aeab9c32ebe1cf13310d704daf32d1d5556fe25fdc9ad264a5d. 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/TCAFK2172895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e71052740038e62509bff3891393f900e7b2a8dd5f70740d67fda5efe6c7adf. 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/TCAFU2166343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8f662de7bb67a181f2b469848e94897b97284f316348308d7f6f02288e074a. 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/TCAFU2169533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f80d227e1c3020f4a64d8d6534dde1c80d2df37cc70f1a3b64c450a14cd909. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFU2169575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f58c906b62370fda74d4faf9c87a0e9d074924b39f4155e6e7fc75e5c625060. 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/DGA052409147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d6bc43a35cacfce8e537734de16219cc120d67ca3c974cd80e62635f96d274. 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/FRX282433167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a5e8b4b37fa109bc098bf9f2899d9f346fe8edb91402324cdce0f55fdae8f2. 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/TCAHE2332362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a579fac36a3b0cad4e4729e3c3e5ee9678007729e802462e52c60366527f29. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX3Q92365952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84aa1c2b48b354bfda933b57beb704abb9aaf2308879ec6710eaf56c03cc2426. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAGN2277104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb57a38dad83f2a00ef95ad1492100bd8f043c1072be2f6e06f1b50faaabe24. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAHR2317865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cb3d3a3a55bb4b894e95877bba7226d9c9643940eb11c7c03840aa0a036574. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAGG2226796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313c0ae5e8826bc959597bee0c142fa63985d09fa54c22ebcbb6c3ccf072d1ae. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAGE2204388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56269897596d0dbbdbb8fb3c7987a8d6f3bd53d87b13977735e2feeede4f2c1a. 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/QZHN92108585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d449ce5c3929d3b60b1ae7d990e33fcf00be243bdbebf2fea0a2f47348f239. 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/TCAFN2125955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75aab98c079a47bd35fc5e32ce81629fdfe4ed6b9741327c95829496c6be48f4. 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/QM7282058299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bd0bd258f2b34c6d970442cb988189f6d0325141a449feb50dbd7f4885d31a. 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/QZNJV2246372.