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 0x48ca717de9dc713e39eac1a767e09187a1ad99e4b9e48d4436d483729ae5073d. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f474521-a185-4999-a8f9-fa9b3938ee9a.json and https://artists.proofprofile.net/proofs/artist/6f474521-a185-4999-a8f9-fa9b3938ee9a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
The Great Conductors: André Cluytens Conducts Massenet & Ravel (2019 Remaster)
Piano Concerto No. 1 in D Minor, Op. 15: I. Maestoso
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 0x67819605739aa83f5529443dcf965293d3f1fa4a0d37e23333ae3d91ce5b5b01. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219501 — a six-check JSON result.
Piano Concerto No. 2 in BB Major, Op. 83: I. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0c75db857984e59a71793b527ac83f9b6d050776754000c84f687393f8c41d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219601 — a six-check JSON result.
Piano Concerto No. 1 in D Minor, Op. 15: Ii. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fd9d81b710ee87d64cab04a5f14781845dac54a39bcef4e40e77ec31d96e91. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219502 — a six-check JSON result.
Piano Concerto No. 2 in BB Major, Op. 83: Ii. Allegro appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd11e3d7e7600b4125b14aac0a90d2cf2302b819c997e35c4d8aa9c3ca58063e. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219602 — a six-check JSON result.
Piano Concerto No. 1 in D Minor, Op. 15: Iii. Rondo (Allegro non troppo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f74651db2695c06021547dd8aff5e43fd508d6629c43df6e2d2a01e523ec33e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219503 — a six-check JSON result.
Piano Concerto No. 2 in BB Major, Op. 83: Iii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8571778ed08afe708c80f0758a1c77d434358659a0cab0c015b8a4f3a77e23bf. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219603 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2988955f022e03dee1ab8845e10fc59cadc4dc2d798668ac6381f6589202853. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219504 — a six-check JSON result.
Piano Concerto No. 2 in BB Major, Op. 83: Iv. Allegretto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26662f25ac52c5412b4bed3bbb36cffab63d1c01a51fc70237688c91a85a07ff. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219604 — a six-check JSON result.
Andante Spianato & Grand Polonaise Brillante Op. 22
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b775967c7197f99b38cbb654f0b32e3478ee29be5e14948cf3ca4a533e382e7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219505 — a six-check JSON result.
Piano Concerto No. 23 in A Major, K. 488: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe686ae1cd4be4bc0bc88ed5266ffa0a02894ac5935af56266607295851607644. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219605 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9bcf27b143bce9323d7f5846cf05a8f6eecc45339c59e035cc85a4385b5213. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219506 — a six-check JSON result.
Piano Concerto No. 23 in A Major, K. 488: Ii. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f08427799dbb1c62109147575f665aadb55eeb17bc5bf5503ec471b44e9b972. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219606 — a six-check JSON result.
Piano Concerto No. 23 in A Major, K. 488: Iii. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee2acd4768e22f3cd2cf755a006b7f58bfe7f94b290ccd775af3237c2f8e74b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219607 — a six-check JSON result.
Verdi: Un ballo in maschera (Sung in German) [2020 Remastered Version]
Mahler, Brahms & Debussy: Orchestral Works (Live)
Hoffmanns Erzählungen (Hoffmanns Tales) Sung in German
Klemperer in Cologne, Vol.14: Mozart, Don Giovanni (Historical Recording)
Klemperer live, Cologne Vol. 10: Beethoven, Symphony No. 9 (Historical Recording)
Klemperer Studio Recordings 1955: Cologne, Vol. 13
Klemperer live: Cologne, Vol. 7: Beethoven, Missa solemnis (Historical Recording)
Klemperer live, Cologne Vol. 8: Brahms, Ein deutsches Requiem (Historical Recording)
Klemperer Live: Cologne Vol. 9 – Concert 7 June 1957 (Live Historical Recording)
Bruckner: Symphony No. 7 in E Major, WAB 107 (1885 Version, Ed. A. Gutmann)
Klemperer Live: Cologne, Vol. 3 – Concert 5 April 1954 (Historical Recording)
Kubelík directs Dvořák: Piano Concerto In G Minor, Op. 33 - Serenade For Strings In E Major, Op. 22
Kölner Rundfunk-Sinfonieorchester / Peter Maag play: Leopold Mozart: Eine musikalische Schlittenfahrt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23df852a16c75c9eb87dd1363b7d4acf02dbb4a83d4eac6e5936dd8237c2f7c6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPZ61191706 — a six-check JSON result.
Brahms: Ein deutsches Requiem, Op. 45 (Live)
Kölner Rundfunk-Sinfonie-Orchester play: Edward Elgar: Variations on an Original Theme 'Enigma' - für Orchester, op. 36
Ludwig van Beethoven "The Best" Piano Concertos (Classical Masterpieces)
Rachmaninov: Rhapsody on a Theme of Paganini - Prokofiev: Piano Sonata No. 7 - Stravinsky: Three Scenes from Petrushka
Mahler: Symphony No. 3 - Debussy: La mer (Live)
Brahms: Piano Concerto No. 2 (Live in Zurich, 1966)
Brahms: Ein deutsches Requiem - Mozart: Serenata notturna
Dimitri Mitropoulos conducts Mahler Symphony No. 10
Schubert & R. Schumann: Orchestral Works (Live)
Bartók: The Miraculous Mandarin, Op. 19, Sz. 73 & Concerto for Orchestra, Sz. 116 (Live)
Hoffmanns Erzählungen: Prologue: Aus dem Becher kommt der Trunk
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf858226e6ac91f4d5c9db41c620755e69ebdcb6b6217de7c8e9cf9d213b4dcc. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804598 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f6fb475de869cd457ffcdbb559ed17f3b8c71f85114e057de643c7efd9cc8e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804604 — a six-check JSON result.
Hoffmanns Erzählungen, 2. Act Schöne Nacht, du Liebesnacht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99bda6c18e13588ccad7e7b4ade81f3d55d6d7a74dbcae5cb53fca876f3278c. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804618 — a six-check JSON result.
Hoffmanns Erzählungen: Es war einmal am Hofe von Eisenack
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6001f62bcc0c0b1dc9860c4295364f09b2020c9b742b5e3bed0751d168a32a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804602 — a six-check JSON result.
Hoffmanns Erzählungen: He! Du da! Auf ein Wort, mein Sohn!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe4ff7de0218cf9012892a73eb600b219a24d2f4b645360b350fd4789c52759. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804599 — a six-check JSON result.
Hoffmanns Erzählungen: Pfui, dieses Bier ist abscheulich!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521dbcb773b0d6dae456cb48263a1b635e8088edd12a4e25df6d3620d74b98c0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804603 — a six-check JSON result.