N/A (or sometimes n/a or N.A.) is a common abbreviation in tables and lists for the phrases not applicable,Barbara H. Foley, English In Action (2003), p. 192.Alan C. Kay, J., Metzler Contracting Co. L
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 0xd2ce554a99ca9a270f60ba38bd1c73209854f520e8aef8ea9347f4222e287030. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18f35d97-b500-4540-9283-e454f54daf11.json and https://artists.proofprofile.net/proofs/artist/18f35d97-b500-4540-9283-e454f54daf11.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Valverde, Gosfield & Jiménez: Valverde/Gosfield/Jimenez
Skrzypczak, Knüsel, Trümpy & Käser: Schweizer III
Berger, Meier, Giger & Jaggi: Schweizer II
Uçarsu, Durmus, Pohlit & Demirel: Orient
Bogacz, Werdenberg, Gervais & Mayer-Spohn: Trabant 2014
Charles Ives: Piano Sonata No. 2 "Concord, Mass., 1840-1860"
Heilige Nacht - Advents Und Weihnachtsmusik Aus Dem Hohen Dom Zu Mainz
Dreamsong / Love in the Asylum / Mars Suite
Barbara Heller: Hundertmelodienbuch Für Blockflöte Solo
Luigi Nono: Composizione per Orchestra N.1 / Der Rote Mantel
Hans Werner Henze: Drei sinfonische Etüden / +
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 0x0164a5220022aaa144a197f55f57998b3f8d4aa16ae33310ca212cb4efd65d8e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEC449904252.
Marco, Guinjoan, Barce & Soler: Flamenco And... New Spanish Music For Two Pianos
Luigi Nono: Polifonica... / Canti Per 13 / +
Improvisationen (an der grossen Kuhn-Orgel des Mindener Doms)
Erwin Schulhoff: Hot Music / Suite Dansante En Jazz / +
Hirsch: La Didone Abbandonata/5. Studie/Streichquartett/Umbau 2/Tragicomedia
Wolff: For Piano 1/ For Pianist/ Burdocks
Cage: The 25-Year Retrospective Concert of the Music of John Cage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27e1a5a03f3f93897f01ed05d1e647cfd5307a3e7f2b945f02953a578fb2c51. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEC445800820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48208ee7d70ea41506082786472d472d4db8c42e0748d57474bc2a8c9b5a61f. 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/DEC440506366.
Buess, How2, Altena, Gubler & Xenakis: Turing Machine
Dadelsen, Swiridoff, Grandjean, Jentsch, Reith & Ruoff: Un lay de consolation