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 0x8ac8b5c1286216f4ce72ec497aa7a206d4d7f78f41f475e4540393ee4e332797. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00bc7cc5-ddca-45b2-ab2a-1a88ab063c17.json and https://artists.proofprofile.net/proofs/artist/00bc7cc5-ddca-45b2-ab2a-1a88ab063c17.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 0x37d192ebc4df4bc12b338aa5292201c78c87f422ba66053cbccd5da8d351fc3c. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FRX871529116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d192ebc4df4bc12b338aa5292201c78c87f422ba66053cbccd5da8d351fc3c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FRX871529116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6eec2a1764a37313d57e9edd6f451428e86bd3fd62e12d0d69b486cecd30a96. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/FR2X41523461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6eec2a1764a37313d57e9edd6f451428e86bd3fd62e12d0d69b486cecd30a96. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR2X41523461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2944ac1f72cecf4cc2a47fc3f8bf9ef9ac67418a36768ac1cfeaf10768cea2. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FR59R2425602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2944ac1f72cecf4cc2a47fc3f8bf9ef9ac67418a36768ac1cfeaf10768cea2. 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/FR59R2425602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507763fef032faa08ef13a8f76b5d1da1b5fcea197f8ddf1e66ac1123ae7a731. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FR59R2442889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507763fef032faa08ef13a8f76b5d1da1b5fcea197f8ddf1e66ac1123ae7a731. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FR59R2442889.