Claudio Merulo (; 8 April 1533 – 4 May 1604) was an Italian composer, publisher and organist of the late Renaissance period, most famous for his innovative keyboard music and his ensemble music compos
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 0x9f289ff3a3b0ea0cf0107b6f82acc5935f60afec9540a28c717cf594071571cd. Chain 2 (Bitcoin): anchored in block 953943 (2026-06-16T11:59:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21227142-986a-47fb-bad9-dfc190529827.json and https://artists.proofprofile.net/proofs/artist/21227142-986a-47fb-bad9-dfc190529827.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Merulo: Missa in Dominicis Diebus / Toccata / Magnificat
Merulo: Missa Virginis Mariae / Toccata / Magnificat
Merulo: Missa Apostolorum / Toccata / Magnificat
Merulo: Toccate, Ricercari, Canzoni d’intavolatura d’organo
Merulo: Complete Works for Organ, Vol. 1
Claudio Merulo: Toccate d'Intavolatura d'organo Libro II
Merulo: Complete Works for Organ, Vol. 2
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 0x4da3a8f69a27a7ae51d9473fc73e11e7d5452ca0dd77c642770ad80ce70f8af1. 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/NLY331504525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc8009b71ed6d1f7ed01d8eb7bccbe98d5bed2f35c0e108a348dacadb573b8e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLY331504528.
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
Merulo: Organ Music il primo libro de ricercari da cantare, a quattro oci
Toccata prima (Toccate d'Intavolatura d'Organo - Libro Primo -1598)