thumb|Sanderling (on podium) greeted by Erich Honecker during a concert celebrating the 750th anniversary of the city of Berlin in 1987 Kurt Sanderling, CBE (; 19 September 1912 – 18 September 2011) w
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 0x62037c6ff294b090336628d25381e5fd57ced291a957d7f84d7f684fe340580a. 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/4cee6211-a5d2-4752-ab14-26a82e63e260.json and https://artists.proofprofile.net/proofs/artist/4cee6211-a5d2-4752-ab14-26a82e63e260.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
475 Jahre Sächsische Staatskapelle Dresden (Live)
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 0x72f7b71d051cee8b4d41637f839680a6d1efd6d877d891dbd316fcff2e3e36d9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEAD62307041.
Bruckner: Symphony No. 3 in D Minor, WAB103: I. Mehr langsam, misterioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1881cb932cf95c25f50ee60cc7608062e4b1f317848dc6cdb138c9ee615b3f50. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/NLG761100494.
Bruckner: Symphony No. 3 in D Minor, WAB103: II. Adagio, bewegt, quasi andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26560734bb9450f3464c8c22918c0f12d9526a1f7f78606121159d5f93589c1e. 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/NLG761100495.
Bruckner: Symphony No. 3 in D Minor, WAB103: III. Scherzo. Ziemlich schnell
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60ad8f87709fb498a83892f014d9fff1de8685e3e33cb372e725e00430b6bcb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLG761100496.
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
Bruckner: Symphony No. 3 in D Minor, WAB103: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0f2e78660e56719498f3968c3cdba91cfd7eba4cc82f6a18f95dabf142fe39. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NLG761100497.
Shostakovich: Symphony No. 10 - Balakirev: Islamey (Live at the Royal Festival Hall, London)
Sviatolsav Richter plays Russian Composers
Beethoven: The 5 Piano Concertos by Emil Gilels
Sviatoslav Richter plays Rakhmaninov & Prokofiev
Milestones of a Legend: Sergei Prokofiev, Vol. 1
Rachmaninoff: Symphony No. 3 in A Minor, Op. 44
Piano Sonata No. 19 in G Minor, Op. 49, No. 1: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad693ff850d5f6b8db1d20fb9abf3ed9a063ac9d1e2480d6fbcc4ee0795888a. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEAD61603049.
Piano Sonata No. 17 in D Minor, Op. 31 No. 2 "Tempest": III. Allegretto (Recorded 1951)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe145831be74342780b72d31c6db1c8e811b3f217155e0a86a603ee557091368d. 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/DEAD61603041.
Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": I. Grave - Allegro di molto e con brio (Recorded 1959)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985aff376cbb70731c746ae6861b221a7ae5ed6237cf725d9a9647633bef11bf. 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/DEAD61603012.
Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": III. Rondo. Allegro (Recorded 1959)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8651d23df66652ac910672b8cd0419385a71c8e9b40c4b212c86ac2eb9766d8f. 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/DEAD61603014.
Richter Archives, Vol. 22: Beethoven (Live)
Shostakovich: Symphony No. 5 in D Minor, Op. 47
Symphony No. 5 in D Minor, Op. 47: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1971b9ccb3c9af0da6a46f955f1aa0ec66492091eb3d014fbe4e5167ef10f2e. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DES380022613.
Symphony No. 5 in D Minor, Op. 47: I. Moderato - Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac0061c6d87564c3f3908aac4a8c78469ba8890f09094401f4b4d957f753841. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DES380022611.
Symphony No. 5 in D Minor, Op. 47: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b1f9831fe7d92eefc5a77d06a4fc7db10209cca76e5392c44bf8f85599be62. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DES380022612.
Symphony No. 5 in D Minor, Op. 47: IV. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a8b3bf4e4a88b65b45970985b3927eafc9130c775835972ef664ce71b4b473. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DES380022614.
Bach, Scriabin & Mussorgsky: Piano Works (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e73f7a76da2bf34baa5868ccb8d19c9b29f317e99970f7c77106b9ae2afaacd. 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/USB8U1517884.
Kurt Sanderling - Kapellmeister-Edition, Vol. 2
Beethoven: Piano Sonatas, Piano Concerto No. 3, 8 Bagatelles & Choral Fantasy
David Oistrakh Plays Sibelius and Szymanowski
Violin Concerto in D Minor, Op. 47: II. Adagio di molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5cac2946af1df2d37de57e73eeb69f83db7c45ce9e2ea6c5ec00854c8f4545f. 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/QMDA61496842.
Violin Concerto in D Minor, Op. 47: III. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112160080c600c3327ef18321b1bbc37e6d75eb4fa7f846176b8e7e3f3c2e3ac. 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/QMDA61496843.
Sibelius: Complete Symphonies and Tone Poems
David Oistrakh: Russian Violin Concertos
Sergei Rachmaninov: Piano Concertos Nos. 1 & 2, 4 Preludes
Sergei Prokofiev: Piano Concerto No.2, Op 16 / Antonín Dvorák: Slavonic, Op.72
Mozart: Divertimento No. 17 & Symphony No. 4
Bach, Mozart & Honegger: Ouverture Suite No. 1, Symphony No. 35 & Symphony No. 5
Johannes Brahms: Piano Concerto No. 2 - Sergei Prokofiev: Piano Concerto No. 2
Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791901906e641033f6473ad62cf38a2073a9a3c7eabcc287705a1d4a50c9da77. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6N21456903.
Piano Concerto No. 2 in C Minor, Op. 18: II. Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f5bbff6c4f66f0edfd94e7c026d3f768ba928f212ae816c1b141cdb3477197. 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/QM6N21456904.
Piano Concerto No. 2 in C Minor, Op. 18: III. Allegro scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42443845348cbfc97017ec584aa4e02e3d09d2f318e09e0626f1cdf9628033b1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QM6N21456905.
Piano Concerto No. 1 in F-Sharp Minor, Op. 1: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cb1a3c8a297f498b19ac27f9d07ecbb8260033963e8f3ebad1fe74b63c3d69. 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/QM6N21456900.
Piano Concerto No. 1 in F-Sharp Minor, Op. 1: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e3390b5d262d63a7b493ec579a22f416e5bf274a3a78f44f307bb2dc7d4f0b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6N21456901.
Piano Concerto No. 1 in F-Sharp Minor, Op. 1: III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9e2a95dd17195f7df70c44153ea0140edc998a12d8f04fa17051d6a510cebc. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QM6N21456902.
Tchaikovsky: Symphony No. 4 - Sibelius: The Swan of Tuonela
Rachmaninov: Symphony in D Minor Op. 13, Stravinsky: Concerto in E: The Soviet Years Vol. 1
Prokofiev: Piano Concertos No. 2 & No. 4
Sviatoslav Richter Plays Piano Works by Beethoven: Choral Fantasy, Op. 80 / Cello Sonatas: No. 1, Op. 5 & No. 2, Op. 5
Beethoven: Symphony No. 5 in C Minor, Op. 67: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d63892ae07197b51d2da65046738cee83bba15e0e4f20492faac3c7cde85115. 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/GBAYD8100171.
Beethoven: Symphony No. 7 in A Major, Op. 92: II. Allegretto (Excerpt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3855b047326b17b2e218e2cf61a41fbbfcb04306740da741f5acdb1bad9d449. 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/GBAYD8100214.
Symphony No. 5 in C Minor, Op. 67: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d63892ae07197b51d2da65046738cee83bba15e0e4f20492faac3c7cde85115. 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/GBAYD8100171.
Symphony No. 3 in E-Flat Major, Op. 55 "Eroica": II. Marcia funebre (Adagio assai)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a6249fc4cb669f0205d4b5e28f201042db4c13744e896a849c493d7ea63d74. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBAYD8100196.