Ingolf Dahl (June 9, 1912 – August 6, 1970) was a German-born American composer, pianist, conductor, and educator. Biography Dahl was born Walter Ingolf Marcus in Hamburg, Germany, to a German Jewish
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 0xaa88315ed47bb77107e7362ee821e003f0a6b464a1d886ad637da52536fb273e. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9897b6ff-eca5-4fa3-a7cf-ad32fe9aa17f.json and https://artists.proofprofile.net/proofs/artist/9897b6ff-eca5-4fa3-a7cf-ad32fe9aa17f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dahl: Concerto for Alto Saxophone, Music for Brass Instruments, The Tower of Saint Barbara, et al.
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 0xae8bfa6134f167b33c6d28e2e4288064a8ff6df9b84089908c63d61640af0fd0. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USEWJ1017301.
Concerto for Alto Saxophone - Passacaglia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764868832f3611314fc11509657143c2e1b09a4637a1e1ee3415e6c653a9ea5e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USEWJ1017302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5433003c8a03cc2906452ac9dab79cd0f4eeb528f0ceee6c01791e702729cee. 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/USEWJ1017303.
Defining Dahl - The Music Of Ingolf Dahl
Dahl: Concerto for Alto Saxophone, Hymn, Music for Brass Instruments & The Tower of Saint Barbara
Music for Six Brass Instruments: I. Chorale fantasy
Arnold, Ewald, Bozza, Maurer, Dahl & Clavert: Works for Brass Ensemble
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe419f84ee332919a14ace9fdaf6df43f10c99d83ff7609fbc769ee7a486153ca. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBLWD0209514.
Music for Six Brass Instruments: II. Intermezzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc155d331c006e10042d86e9c680192128aef1f0832837974bdcf119316bd8acd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBLWD0209515.
Music for Six Brass Instruments: III. Fugue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cd5bd2c09f20e824b211cd4a007cf467ba9346f74f127b9ce6fb96e26ded73. 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/GBLWD0209516.