Jacopo da Bologna () was an Italian composer of the Trecento, the period sometimes known as the Italian ars nova. He was one of the first composers of this group, making him a contemporary of Gherarde
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 0x96f45cb2c5e4f1a845afcf7592d9ddf407d434c21b15bec90400c881f732e744. Chain 2 (Bitcoin): anchored in block 953794 (2026-06-15T13:43:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0d5bb80-c79a-49c8-b609-71f816c968e8.json and https://artists.proofprofile.net/proofs/artist/e0d5bb80-c79a-49c8-b609-71f816c968e8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Da Bologna: Italiennische Madrigale des 14 Jahrhunderts
Jacopo da Bologna: Italian Madrigals of the 14th Century
Trecento Madrigali (Jacopo da Bologna for Guitar)
Instruments of Middle Age and Renaissance
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 0x02b64700689ad2909205ddd4f0ee508718dac55b1c0c47afd381e181335d1168. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAYC0700705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2b2bd6f04b3528f1367f339c5997902ef1198b4bfc9c1b2929e3b784395a00. 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/GBAYC0700706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d62d51817cb267e237e5671e17edf52254ee885f3a343b25d80665f9577fa86. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEY321808002.
Aquil' altera, ferma / Creatura gentil / Uccel' di Dio
Codex Faenza: Instrumental Music of the Early 15th Century
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a78da4f659c8b1a1df2e962376e90e1831b7b3fe616330e45bfbaf8bdbbddf2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKI199700809.
Codex Faenza: Aquila altera (arr. for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf1601a61e2b12539c11a733824cd215b57620e9fd6f18d3aefcaad25f7aadc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKI199700810.