Léon Boëllmann (; 25 September 1862 – 11 October 1897) was a French composer, known for a small number of compositions for organ. His best-known composition is Suite gothique (1895), which is a staple
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 0x983f14ecb8d8ea4900134a4587443954c9bee5a46ee79bd22430fc8538db7bf6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f318d61-4dc9-4089-a86f-8e0ff6a604f9.json and https://artists.proofprofile.net/proofs/artist/0f318d61-4dc9-4089-a86f-8e0ff6a604f9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Léon Boëllmann: Les organistes de Paris à la Belle Époque, vol. 1
Boëllmann: Fantaisie - Heures Mystiques - Suite Gothique & Offertoire sur des Noëls
Boëllmann: Symphonie en fa majeur, Variations symphoniques & Quatre pièces brèves
Suite gothique, Op. 25: I. Introduction - Choral
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 0x8e73a7a596a8a2a9deaedf5894a314ebe8fdde82b373b0ed0b0cbc25fd07b10b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SEAEB9457110.
Suite gothique, Op. 25: 2. Menuet gothique
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1973dac21513344b9cc04375ef07c0a7e06d6b6723985c354a99a601687ec5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBF078710472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ab1a61f8cc67b7de6b3c09a16a2e91adbc09ca9ddc1add0101edae7c314d05. 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/GBF078710474.
Suite gothique Op. 25: Prière à Notre-Dame
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c85fbe72d8da379d51073bd1c368ee05d7871423abb7bd120fed6bc3412c92. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/GBAYD8800798.
The Classical Halloween Collection: Classical Music of Doom, Dread and All Things Wicked!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d47710626093bfadcdbd27930a33ce2ca64c5a2e03b1d61420343486eae4fd. 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/SEWDL0713612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b4e6cc6134c3e3e5509bcc9bee91d86afff11db7a17f8dfabc6f0809e37e52. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/GBC7N1046712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00ead503161899cff3851ebe553d957e76c953bb9deeb7675b2ace73361981e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBC7N1046709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071e362e2ebff482be6867eaeca4b88fca98dd1f41cbe45cd44e9fbbfcc7cd5a. 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/GBC7N1046710.