Vladimir Samoylovich Horowitz (November 5, 1989) was a Russian and American pianist. Considered one of the greatest pianists of all time,Time. Michael Walsh, The Greatest Pianist of All?, July 21, 200
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 0x02adfe0503797e39937ff3d109899e8abcf42f2f51dc3b745badfcee84cdb84c. 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/146c3cf1-5be2-4513-8a48-4013f5b1022b.json and https://artists.proofprofile.net/proofs/artist/146c3cf1-5be2-4513-8a48-4013f5b1022b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Piano Concerto No. 23 K. 488; Piano Sonata K. 333
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 0xc547f6c09b90f5f610884bf5b72ded28b193ed630b0e6c3323ee47bd4eaffc4b. 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/DEF058731807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4a7dd379e07157889577c5d8558d48e484a1fd9caa0220eb9befa262921e7e. 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/DEF058500800.
6 Consolations, S. 172: No. 3 in D-Flat Major (lento, placido)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa730aa383a82132b9a0d73d7df077e74e52ae89f3d34652b1d2f82579ffa6e7c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEF058500370.
Hungarian Rhapsody No. 2 in C-Sharp Minor, S. 244/2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413ace10152e4297ae6a3d9c161aa3a3475bc4834b709b6ab025311a3d770eb3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USBC15300135.
Concert of the Century - Celebrating the 85th Anniversary of Carnegie Hall
Cello Sonata in G Minor, Op. 19: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18b6fd1fb0901655d3a9bfa9e75c46c8500478a8398c3df3a58f295a2dfb0c8. 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/USSM10410652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8262a203e1cca8235697857c980f6499a4768e3f805a879fbff2b23e46d07820. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF058603930.
Danse Macabre, Op. 40 (Arr. Solo Piano by Franz Liszt) - Upon Piano Roll Duo-Art 0970 Br, Issued 1931
Flâneries. Brahms, Saint-Säens and Heritage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede9c2c0f9f687331dd97d5767cd27d42976b0331162d5a09cdd218eaaffd214. 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/DEPI82435271.