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 0x9e3b0642865855d7a68e5c810a084b0a015be381ef69ba19362080b7d1ca1706. 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/c87cbf7d-5cb6-43bf-8bf8-3362e1f2272a.json and https://artists.proofprofile.net/proofs/artist/c87cbf7d-5cb6-43bf-8bf8-3362e1f2272a.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 0x6accb6f61f098c2ec92009bbd9b988336030fbc1888b104a1a1fc1cb8e461906. 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/US7NV1800189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c63d34a5acc76d702418f2d1b1f3655de01d0af8f1f909d96e68f6fa09e0ea. 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/US7NV1800190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e27006d415d6e9c8e7feb2242d569f60ea4bd0ebabf9815ded22f9f52c9db0d. 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/US7NV1800191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa792e65ea79ac92dcc55a089d5877dbd962d8219fe6e09d192cbd28161877280. 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/US7NV1800192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4068b9740e87dd1114bcddac8ff18bd0181ca048e3a300d869353d9aa40299c0. 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/US7NV1800193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e983d9e7f050f3700e9650e7f690bb91e009afecb0bd2b9d330cd9bad72ce27. 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/US7NV1800194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f15a222da3bac8968b4c0bbf318ed87dd28b9a5af79557fc0c4a2d58878fbf1. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/US7NV1800195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948b22eb2f0d7390f2cb62246acb50527e6461b0eee783f7f441e318b8e8210e. 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/US7NV1800196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426b657addb11e7335db256acd0b54a28dd37e50ee538f34f0bf3395e978055a. 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/US7NV1800197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7a0c02d92ffedd0afefb3e9817db3b7132c7d24db33c17792eae81a7237e04. 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/US7NV1800198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c62142139a8e380ac2dc2d60d218f374469c293a6c0ecc187cd620dea75bdf. 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/US7NV1800199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6585b393bc366de67efe87595208df0768c9732bef7526a3c770299dca45df. 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/DED832300699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7a51ca2cfb54377f3da3547566a0206e8c2fa1cc5fb1eaaed8eadec4fa2258. 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/DED832300700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c063ab36989765fbdfe56d24dbb103993b4c2cd01c1f73de3d0010a6dbd8cde. 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/DED832300701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fa32ea21d1b43abe398d9064961e0c0f4cf44605793eb5f74f3ab62a6ef876. 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/DED832300702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f08e9e4eae38d42ee0809f637eaf9204b83e6628802103b818b380ca7b197c. 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/DED832300703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6b3613aa3c66a512c51c67d325e689d1fe58a59c96875f26beb1ce8cae828b. 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/CAHQJ2307334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e8d6dbff3b1f595260f66483faff1713e244abe23bd44cc85407422691a76b. 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/CAENV2276368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c835d8ce74a3e3ade86dd00212ac6376fd1a6d6fbc072aca846ca0e140d1614. 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/CAHQJ2285828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7123e1d574e8b9aa6db5add2730b0c1435eab5e3283151c9aa38b55ba4fccc6b. 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/CAENV2192778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8f12f05f7d09b3c50aa39b41cd08a0b716bb3ea83c20402aa1e2ce9aa1a744. 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/CAGOO2039534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5e85fe08713fe6dfdbd2a31f3128e083cf89ab9f6bbe16d009f9e792119da5. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CALVP1950371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd376b4c80e83f5b9683d26184109b0b9404225d4ce077598c690ea5d954103. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/CAGOO1963885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6accb6f61f098c2ec92009bbd9b988336030fbc1888b104a1a1fc1cb8e461906. 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/US7NV1800189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849bed9cb1a5c838443c7b495fd4c06fa8671c662e199e4b04f4a6f9448de052. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZPLS2278564.