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 0x4034e10e2b192e7ed5b48464068c0c954af9c837be41aaf0844d91ba5eeb3759. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a37d450-b142-400c-8354-cf9c0dd58cd1.json and https://artists.proofprofile.net/proofs/artist/1a37d450-b142-400c-8354-cf9c0dd58cd1.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 0xc3c206353191a686bdbe90c870bc2ca18957de6e90cd7faa941b2e3d32afa7dc. 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/QZQAY2420420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad52dccc076822db6bdbbb6b93dc7abc88a0e320d786962b5bd7cf3381799628. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZQAY2463398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34cf9fedf912ac8dc0038c7fc47ff171176f5e65fdabc0bfd42979087eccde7. 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/QZQAY2465835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b867efe0891ce9107c847018bb3a2d41fb56365e3914cd0aaf18f1220eb2524. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE6SA2435161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce37f75798adeaca9c1da6c1b11cb0b71e690ac618e1049c34bb096c7f71da6. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEZC62446365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600e2163ec7e8b48bf4afb83ded7b9feda5520ff93cef8ec40511db9a1b46a72. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/SE6HN2457522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed5c0e4fa85923f6ca874c8852eeff1d98ee6925e6d8328c0b6c37c810b9482. 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/DEZC62418804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bf4778eab82ee276a62a454704b142b7b6ff6430a0fd5dfe7ee1f513c99f9f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SE5752485484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2c95bb498c53efde5ea0e1e23c83df7a589fcbc2e85b6b2e41cbf85051707a. 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/DEPI82405923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a2d8a6f4af801360c72cd8deee94a771e814703e93c043fdba3fc05e01134c. 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/DEPI82320781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1e87ec347e282672743528481eed77c9a0157aef1ddbffcdf4b8d25424dfbe. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEPI82313939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac738516c1c1bd6954ece46c8bfa7cff7df67739ace7290d776d5e8e8677f2b4. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/PLB382300344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c3de7a9cc6ee2962073c5ae16df19ee3f734894da3e4fb604dc068bfe11237. 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/GB8KE2310077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1060aedd0f66283cac4416b0cf143146de42b2c599359d4e22a27bd3b682b43. 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/DEPI82303601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc666f94478d52691af78e58771c81b2e3f8567394c4322c4e892c8b243f312fc. 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/DEPI82302511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe23f1a23c8a17afd2ab5e8a0126abc17cb7c58a30a8810d44d79144be7e00b5. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/QM4TX2246401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cae9d87db74829f3f1a6b859d0855bf8ddbcfdf029996a3d53e271f7f603e18. 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/QM4TX2226269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40baf4df9fc56ffd757ca796bce14653f34969b414e0711c891bc086f1dbb32c. 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/SE6QE2155096.