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 0x443b374975a91f23de2565a4c49a9be13d35228022da51f24ec56ef376f9c347. 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/74b10036-a784-456c-8604-8dcb05e923d9.json and https://artists.proofprofile.net/proofs/artist/74b10036-a784-456c-8604-8dcb05e923d9.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 0xd3852f5ac3c67fb696141c95ace322d163050b283cfd481d24d747c3514b8686. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHNB1991500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df8a29d488a8846d04f69edef4e8ee6a8930e94f22be1f276c081f5c637fc59. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA072130254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461b8dc148064419e1c8d43fa5894b0a6dbb4af7f168b9f5f5f9b7f334c41766. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/FRX872145186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90f1e13eb6ded04445dbd5ef6350ae9d19357813058381032e306135f4cdb9a. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/FR2X42258225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb6cf718e979c4d98537f2be8d04471755b8412295c89b912a0c71828265898. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/FR2X42258227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f8ca8e31bb3b346bd2d66429318fd5537158d709d361db6bc5c00b06a82b29. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/SGB502312819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c46134ca2dc68d912d0dec1786d1f3c79b819c058e95bd9acda71c4705d926. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:37:17Z), 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/GXBAV2482131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb685c7f0db20678f47e89ef3d69fc63ed033b12eff77a85f545ffe8609a68f7b. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/GXD7G2205649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c46134ca2dc68d912d0dec1786d1f3c79b819c058e95bd9acda71c4705d926. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/GXBAV2482131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ac60b44c5eedae02d1444a9bc32f19a71a5ad1f059d326977c769715ba4894. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GXD7V2200651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3132d02f63a3b2895b36e2ec1682b07ad63059abae02224fda40f767839e7fb7. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:08:45Z), 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/QMFMF2510586.