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 0xd8e361d8b8254bfaacf454023807af1f633418adebe754e069deaa15405ff656. 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/dad94ba5-12ed-4624-a7b4-8455bae82c26.json and https://artists.proofprofile.net/proofs/artist/dad94ba5-12ed-4624-a7b4-8455bae82c26.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 0x17069b148a8826246e408312cdcaa26483119ba14dc21736d7e53fd264a71753. 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/NLYK92300144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc853153548443a96a8a8b6e102b8ff65b465e6470ee25bb8ebd295fecbca6947. 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/NLYK92300089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8ec7b05d4acd0c9047202ea1e6d618758fac64396c4f2e39b8a40a08b2aaa9. 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/NLYK92300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbeb5e7c479b1d9f7ddf54807d9d84d6c684d35c50dd62cae11267b298db6c7a. 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/BE8LH2200124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9520d65d7dc1ed2891ac061a1a7973cb059e7dad101db49f9aa222f12e30d5. 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/BE8LH2200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62b36824439c04f0da45555942c00ac469b9e125c353e5565efe497d1dfe35b. 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/NLT2H2300924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e415ce59004b29dea700f8b37f37b0aedf1cf7ba067025a8ead368bd9c0272. 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/NLX3Y2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4beca26a33fdebad1c35be05493051fb8019a8cd93c84e80b41714162550c4a4. 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/NLX3Y2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6201e012d66b38f5f650beee51b9941b4fc4f7a14724cda12223bcd17e7ab98. 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/BE8LH2300280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4822196218469c28b8de4bf2a96dc83a826fd294a3ad0c8577566d4e11485f47. 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/SE6QE2368075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea3dd6c96299c0dab2bb09cb8717af54177b1ccbc4e2c9a1e2075a4daa28421. 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/CA5KR2348501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b268d400964a89c2dca907ba2bb7b13a1b8cc0615c45c51c8c4cca966e6e3fe. 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/BE8LH2200139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9f03c1ab81292ac41a037e56b639c75f6922e7de325c1adf75a0e8eae88d35. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:51:10Z), 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/BE8LH2200081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedb2e1b84fab209b7d326c800240fd36dd335f92c2449b9c0aafa2deb48232a. 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/QZS652253647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9520d65d7dc1ed2891ac061a1a7973cb059e7dad101db49f9aa222f12e30d5. 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/BE8LH2200067.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbeb5e7c479b1d9f7ddf54807d9d84d6c684d35c50dd62cae11267b298db6c7a. 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/BE8LH2200124.