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 0x424b4c798ad8995b09058af82573644d9fc6831bb51ada8e1a4954aa99ad66e6. 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/cd82029a-f5d1-4252-a0ea-9e4e8ea8030c.json and https://artists.proofprofile.net/proofs/artist/cd82029a-f5d1-4252-a0ea-9e4e8ea8030c.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 0x98b6c018ee9abc46843dc369b33d29646aaf4688f3aeb437ca7d2d7e5f2e7641. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:31:37Z), 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/ESA011578667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca09ba85745704dd1cd9813f82fdcdd0a80f051f085d0b4b7b2891a54a0ce236. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/ESA011574530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4080a27de409c841e09468e50c4a1f47a8d9a59eb51f36537f70681d2686847d. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/USL4R2446867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff666314bf2fecfb92045f2de4a688b87dfaa5dd4b1655d5049fa1949143143. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:18:17Z), 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/USL4R2446892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcb4e0e70c7e75112ddb6d84431e75932fa117fa1b71e4b9996f971946ae8f6. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/USHM92545470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de45cb8a525e1d3a63005e94d185b7e5a3b16b45d883fb9ef591f58f4fe7dfd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ESA011947526.