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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be8c885a709e252606c98e3f1b44a778e5a362a9a868baf93a69c1c7c6b3b2b. 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/4c5b46dc-d3fa-48fb-a231-92f8e78835ab.json and https://artists.proofprofile.net/proofs/artist/4c5b46dc-d3fa-48fb-a231-92f8e78835ab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7af2ab6be1e8b652dca9706c4321f203b0f5bc3244d255b4891c9798a1891d1. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZES62164337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865623325e31db37797b25930166d1a184c6ca4ee031f4eae2945c05acfd80b9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:36:05Z), 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/QZDA62299438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38315c0e9e5d9da3eabef0e7efda7a02e15560cf46be74c61020388e749febf. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZTAZ2235428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb107d00d7bac16683207129c26830e99594541e03f3d6871a9ccb0c84a208134. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZTB22345527.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b12fa5569785272dd02043fb2e1e6b06fd230a8eaa7e4813d8645693dd48ede. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZK6G2466736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd491c4d0e04e6ab4b4eec9a6e3a593a1cd709497039c24bc837927801b84df38. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QZHN42159055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2565af01725c96b48e679330d7253447eb2dfff922fe1dc7b0556f43b20c31. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T05:47:39Z), 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/QZMEM2102331.