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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 0x24081ad98a9b167da786a8a16ab0b519e1def20121d7fb713fb701b2b21d5cbd. 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/35ad0455-4e7c-4e2e-a41d-2d9d3ac8aea8.json and https://artists.proofprofile.net/proofs/artist/35ad0455-4e7c-4e2e-a41d-2d9d3ac8aea8.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 0x37960bedd490c9b166750e988c43a1205138270cc8ab86669625e9210f620647. 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/NL3GQ2100352.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96b66e3bb3cf296a614f62215b8a1d3dc0d5ff977bcb06ea60d28ab8a4e5547. 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/NL1AP2051295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c32854df6afdab13c213f4fe766a0512936ea30557b37196cbde913292de3d. 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/TCAFJ2142407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1b30c60b383214a6d44ad1bbad52e27057aac235dfafabf1701b4ba81e5fe3. 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/TCAFJ2142416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ca0fd78b7d6b794dbd2e4fb6d9e6307f2bedfe96f8ab90a1414f278adb4b19. 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/TCAFJ2142427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda6916ad447e85214b623cd5e4d412e2a8c03884f904a073fec7c5ba16c2614. 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/TCAFJ2142444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb0a07c3b1103a8b1c80c5956a264ddcdd3db44184dedefee1cf2219a86d275. 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/TCAFJ2142451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d33bfa5ac0ff82e765a972b307be07915b86e55b6e54e8bf6de9f6670fe959e. 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/TCAFJ2142459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41660f758ea8c1a9a80d53a6a5fb7c2e1d9668562784f288707e52f7f65824a0. 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/TCAFJ2142465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc524267b0419d4c55cea80754b850441391054da7131d8b48045237ca351b19c. 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/TCAFJ2142471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf6f78f0fa9112c0efbb66967d1e549d2194032d8cc259055b0879867af4ee5. 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/TCAFJ2142494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c762ec80b8b7c796d5810d9612c47d63b724cddbad0b5e95b6551d6c572809. 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/TCAFJ2142506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4709a3a873d8a04f39165ab83fa7be3ffbcb6a00f39cb9e72c968c6834443c6. 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/TCAFJ2142512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5df6e7c80764576f03c04e9ad6c6bafd4855c334580cab501ca3f01b0549b6c. 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/TCAFJ2142523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11dcdfea33b73a08537503050be9892c73918a686f6a56c7b737380ea3bedb1. 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/TCAFJ2142530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8249715783812ed127e63ef098b14b96d361e0a1b8ac306c62bd7abbd8a3e2. 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/TCAFJ2142549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa590fa1ef78321acba8a3db4f15aa5989b194ef3c821d4309c9c2fb9795ecba4. 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/TCAFJ2142574.