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 0xd04c3b3db72994b750d17a2de57c2b9c9ac4c647051a19c21977b9a2fb7cd120. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f89d745e-33c0-4ff6-bcef-efcc17ee10d8.json and https://artists.proofprofile.net/proofs/artist/f89d745e-33c0-4ff6-bcef-efcc17ee10d8.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71216e44a162ef96cf5fb9ba046d82f01b97357fd92e434d4568c1fa1d91f0eb. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/TCACD1519929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e0f2a8e1946ed35dee0e104696e1ac3debfe2105be4fbafc1cd33b2051270c. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCACD1519952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2ceefdafc9e67f89d531b49a4f9b475f2ee24a694c5fa082225506ff89c9f7. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:10:39Z), 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/QZHN61914970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5c407709d5902d5651b3ae386afc8ec6128841df59163c050e425a34aec8f0. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZPLS2235210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549fe8eb76f0b5c16fb2788aa3200fb2b28a729da348b0426e26f939c9bc3c25. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:25:07Z), 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/QZTB32319170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4426ef95913517abd855b120978665f810c7b7fa9bca6ee35c0b758762ce7038. 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/CAK472000613.