thumb|Francesco Corteccia, Hinnarium, Biblioteca Medicea Laurenziana Francesco Corteccia (July 27, 1502 – June 7, 1571) was an Italian composer, organist, and teacher of the Renaissance. Not only was
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 0x830f7cdc2214eadb9ece53d77eb83ee677c728ec1efab05d406992609062b90a. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/631d3132-e11b-45cb-b2ae-a376cb1a251c.json and https://artists.proofprofile.net/proofs/artist/631d3132-e11b-45cb-b2ae-a376cb1a251c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Corteccia: Responsories for the Holy Week
Francesco Corteccia: Passione di Christo secondo Giovanni
Stadtpfeifer, Waits, Ministriles, Piffari. Instrumental Music of the XVI & XVII Centuries
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 0x7e1469100b4a39663cb4ea7ee574e1c3e764ca69d2998edf6512ff4cf8c306af. 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/DEX990820404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e06e55f27d158bd851c6adda4982275eff2673df179fe1d7039ae3d13ff91b1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES7891200504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce47515b73e1c37fa75894d699f5a16d81bc9ba667f424f7024ab807664de55. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES7891200505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa746406db26f134c66ffc3ec6ee33498d9a1b241721c9109387210f7e13bab96. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES7891200508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b0a6723091806d8a2ebff6841ec78648720c87cc37ed023ea17216cfc24353. 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/ES7891200516.