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 0xc86e11b7208cb2117419986f427c12c099a696f560285561daaf2b415e167cc0. 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/6fee501d-2ff0-401f-81d1-fd8bdc27edff.json and https://artists.proofprofile.net/proofs/artist/6fee501d-2ff0-401f-81d1-fd8bdc27edff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Trio Hugo Diaz: Classical Tango Argentino
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 0x0029f4e043ecf58df9b4b4b8e2b9f43473b465c129401261476a9ede3593f1e3. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/GBCKG0701065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835adf5f323a9181f5251d5c039650f18805c803194fb4590996c3b139063133. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBCKG0701077.
Trio Hugo Diaz: El Motivo - Tango Argentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7520bd15d865f29cdc9e363dfa13fb0b87a56354723798af2f400c1157f978e7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBCKG0600396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c51e80b65e231f1b193362c792f35b4949db78ebd67c2cccc38a649c3e349e9. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBCKG0601309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa7e13ed0c37c94f8c3192a45039c3485a16ff6999c9068bb6a26fa856404f2. 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/GBCKG0601312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5749f01c6a88fb28fe750c5adca27912349fd2b49d77ebeb366672bec93b3802. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/GBCKG0601318.
Trio Hugo Diaz: 20 Best of Classical Tango Argentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cc87cd78d6384feb82241d819ae80c3a4b8e834a7225d148865e5e64100935. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T05:08:10Z), 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/GBCKG0601374.