thumb|upright|Franz Doppler, 1853 thumb|upright|Franz and Karl Doppler Albert Franz Doppler (16 October 182127 July 1883) was a flute virtuoso and a composer best known for his flute music. He also wr
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 0xc3116e7c5a9c5f1b37b1cb65e87c6aeff86e8138314cda8243d133c874ddaab6. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/95a3f349-da58-4ce7-85b1-5aa5a9c8331d.json and https://artists.proofprofile.net/proofs/artist/95a3f349-da58-4ce7-85b1-5aa5a9c8331d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x3827810b883a589a847ae787a8381be7877c81bbfc024e9623b00eb08beec83a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBLGL0810173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe325718b762da44492894e8fccce4c4c3e4e7d636f009a8637df5e11364eef5d. 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/GBLGL0810180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde071a8bcb2d2b69a614ff5bb83e41ac23c4dd38d87ac78354d9e628e2699bbc. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBLGL0810168.
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
F. & K. Doppler: The Complete Flute Music, Vol. 7
F. & C. Doppler: The Complete Flute Music, Vol. 5
F. & C. Doppler: The Complete Flute Music, Vol. 4
Franz & Karl Doppler: The Complete Flute Music, Vol. 1
Doppler, F. / Doppler, K.: Works for 2 Flutes and Piano
Fantaisie sur des motifs hongroises, Op. 35
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1cc3ac690b2ea7f40cf6369cfe043279d8f00239d89cc460da166919e2d91f. 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/HUA253164801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551b3209934a5548c89add4956f451ddfafc4bd089fbcae6312c63d7f2b02a38. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/HUA253164803.
Doppler, F. / Doppler, K.: Music for Flutes and Orchestra
Rigoletto-Fantasy pour 2 flûtes et piano, Op. 38
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17156bdf26031eb801239016c00eb8bab17576e65b8fdb5d54bb70488ea5c959. 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/ATMA40510605.
Souvenir de Prague sur des motifs Bohemiens pour 2 flûtes et piano, Op. 24
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4f6ee681de81282b360c212455de631a09c932f5dd9f1cc866b99da94deb15. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ATMA40510606.
Fantaisie pastorale Hongroise pour flute et piano, Op. 26
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b68cb9d85d985c84402ea37634532e4f88f9aed7400ed866ed38f62dcf66c4. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ATMA40510607.
Duettino sur des motifs Hongrois, Op. 36
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615fb86ad1e7eddfeeef831b643eef77139eb972e443063c6dcb8f840969fc6a. 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/ATMA40510611.
Andante et rondo, Op. 25: No. 1, Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1e178ec2c0cecc71e58d8f818bfda6d9cb3814a02f7461a671111c56dad7b6. 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/ATMA40510609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340bc6bae7e9a3755d82646ae8af8a1b0672e6a93dec920239a2fa7facbc1acf. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ATMA40510610.
Doppler, Franz / Karl: Complete Music for Flutes and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0a565264c5128167d15ee5c878ce7a475743ab1373324455eb0df8afdbd3dc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SEAEB8746030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0b233160e18b0dd4ca99268faf1a49cebd5cbbcd40fe71ffd01c71f162d2f9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEAEB8745040.
Airs Valaques, Op. 10: Air valaques, Op. 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdec1198c63234063d3be20fb7c86e985174059947f9e9ba4a7ec5a8c5282f71. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/SEAEB8745030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc9dfa1efb6cdc81c8411e923a288aab9b5825de1d14cdd3899149a974e62e7. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SEAEB8745050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ec68bc78cc0976c55d64ff295eb08cac9c6b2802b05a0943d94362d942bcf2. 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/SEAEB8746070.
Liszt: 3 Rhapsodies hongroises (Mono Version)
Liszt, Doppler: Rhapsodies hongroises Nos. 3, 4 & 6 (Mono Version)
Valse di Bravura for Two Flutes and Orchestra (World Premiere Recording)