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 0x46873e2a661c15052e12d8c18fae2ff2aa03e3cea7028f72b75507adc123cb63. 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/7a4fe6dc-6439-45a8-973d-4cabec1a117f.json and https://artists.proofprofile.net/proofs/artist/7a4fe6dc-6439-45a8-973d-4cabec1a117f.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 0x72173a6ffbc7341fa6ef5f3dfabcb429bbe0292d6013e9dfcaf224a846b1ce1e. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:08:00Z), 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/TCAFZ2279916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8c347b00b32687c9807324563bc65340e43671ada592af0a956becd56bbc42. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/TCAFZ2279918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065671aabab271676027c9f3f1c6dae8fbd0f0bb90b33861c9e46dffa0ee5fdf. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAFZ2279939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf876e9137766d08c975e287f91f0deacf0dd869c725a307c40713b3b518e7b. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/TCAFZ2279941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb511d1519695930f531bf51276244448afafddb77583beada8b661061f17602. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/TCAEF1990459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e33c862d0ae131e3b3f63dbd22f7cca1afeead1d795f16b42b8a6199ef5fc53. 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/TCAEF1990477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c4aa116335ec43712f3d00d668076aa322cbdc5aac0acf6ef5f2c8f169af17. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAEF1990496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fe06d0cafbe3061d24cc8717970f08f2c62955385b809922c78d68ecf4fcb0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCAFI2150841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ff4f1041cce11d503283e1ce9ba940c66ab55f228ea3b1659a3a8ceaec558b. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T19:47:16Z), 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/TCAJB2433240.