thumb|alt=Reproduction of a painting of a woman with a lyre and a crown of leaves|Corinna of Tanagra, , by Frederic Leighton Corinna or Korinna () was an ancient Greek lyric poet from Tanagra in Boeo
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 0x898fff9569ceb85ca7ed679d2e388022c3fb1122e8114b6b9ea00dcd8b9213da. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ITZ7U2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8540c79257afa349fd27aab524050bf94d86518fba2105590cda1ba4c1520586. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ITZ7U2400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5448ad48e60cc588b341219376bf0d1f076e1e8d8be74af5e8df121bfc9058c8. 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/ITZ7U2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12385c292d79a79c288cc87a703a475fc68ecdd5d5f403da19ff6aa7a7508349. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ITZ7U2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39124629b341242d6cd70154802c666082ce71e6248f8b97f9ec4dfc3b62eb28. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US39N2300879.