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 0x964a8c9a485bafa3fc841bc002495a09ac1a0ea538b315908d570d5dd8cb3eab. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca4d8660-3b76-42f6-995e-a680f4fe72b3.json and https://artists.proofprofile.net/proofs/artist/ca4d8660-3b76-42f6-995e-a680f4fe72b3.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 0x8d2ede0120eac4b4d0c4191f202f9c3aec9109e6c3ecfe501975f79889d92f69. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/TCAIS2411195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838f02a2e47d6d83b9118a624f07541e4c00d9016ac3417199b99d1b30d8e5b9. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T19:04:02Z), 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/TCAIR2419979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba16d4a720e124337fa832b330a06617827e1708b8140bc81e93e30efcc4f058. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T18:58:44Z), 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/TCAIR2419983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8aeb9a24a144b062184f8634f16f80ff0205b0e9f751322151a20e4897d5ec. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TCAIR2419998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3532729410c4540e919f37f07ca6b8a9eecb2e46cb3d5b758e5ce2874cc9ac. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TCAIR2420018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a6b952a8addd7c7fd08bfd6c6f4b1a1ba6bb58c02e0a3a43df0a9b2ceeb7b4. 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/TCAIR2420036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213620f8a10f0f4965f2d20671c6f48f54b0afde010dcd4790f1a09f78c40fbf. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/TCAIS2420062.