Pedro Alcalde (born in Barcelona, 1959) is a Spanish composer, conductor, musicologist and pianist. Biography Alcalde was born in Barcelona, where he studied piano, flute, violin and composition an
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 0xdba19e86a5907a4c2a2e6b6b48ddde2a17a9af1c95b8a1b81bde23ea1f2ad4a5. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2271b79-1244-4db5-90fd-12d29023e467.json and https://artists.proofprofile.net/proofs/artist/f2271b79-1244-4db5-90fd-12d29023e467.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ballets for Nacho Duato_01: Herrumbre 2004 / Diecisiete 2005 / Alas 2006
Ballets for Nacho Duato_02: Hevel 2007 / Cobalto 2009 / Jardín infinito 2010
Ballets for Nacho Duato_03: Static Time 2015 / Erde 2017
Játékok VI, 16, Letter to Marianne Teöke
György Kurtág: Diary Entries, Personal Messages // SFB recordings 2001
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 0x5b5a490a66b08514907508767199970ff2401bb1405b4bbf2b4cfba58376252d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZDA72350227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e0aabdde1455e982451010a5f09ba1a5ec30275c4eaa8121618590591f7caf. 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/QZDA72350229.
Játékok VI, 21, Day-dreaming ... (az elsüllyedt katedra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634f94c104123b8e739ec9067dfbce08033dd4f357e07095d0b02e4dc54c96f6. 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/QZDA72350231.