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 0xda5f442cff0404fc7f0ddf4ff494764c7f99f90a1cc68ee9f5f595c66aad883a. 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/8d4b06f3-087d-4261-9d46-296a8f42e012.json and https://artists.proofprofile.net/proofs/artist/8d4b06f3-087d-4261-9d46-296a8f42e012.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Karl Schmitt-Walter, Vol. 1: Opera, Operetta and Song
Heroes and Heroines of Bayreuth: Friedrich Schorr (Historical Recordings 1926-1932)
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 0x84b02c7f709283154f6d8a039f8070ce471f35d0ade2c1337bf82d0a396297b5. 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/DEU240520656.
Il mito dell'Opera: Mario Filippieschi (Recorded 1955-1957)
Il mito dell'opera: Giuseppe Valdengo, Vol. 2 (Recorded 1946-1965)
The Richard Tauber Collection, Vol. 10: Opera Scenes (1927-1946)
Singers of the Century: Erna Sack - The German Nightingale sings Coloratura Masterpieces (1935-1942)
The Richard Tauber Collection, Vol. 14, Franz Schubert: Winterreise, D. 911 (Excerpts) & Other Songs [Recorded 1923-1942]
The Richard Tauber Collection, Vol. 4: Early Opera Scenes: Strauss, Wagner, Verdi, Rossini, Puccini, Wolf-Ferrari (1920-1927)
The Richard Tauber Collection, Vol. 11: Opera Scenes and Opera in Film (1928-1946)
Schlager und Filmmelodien von Walter Jurmann, Vol. 2 (Recordings 1929-1936)
Schlager und Filmmelodien von Walter Jurmann, Vol. 1 (Recordings 1930-1938)
Hirsekorn greift ein: Ohne Worte lass uns scheiden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b63c7ce08d0dfc727422f51cff45e92bde73f4e82b9087340d3f03866e6da5. 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/DEL111200698.
The Richard Tauber Collection, Vol. 2: Tauber sings Tauber (1924-1937)
Glamourwelt Berlin, Vol. 2Das Große Schauspielhaus - The Great Schauspielhaus From the Weimarer Republik to the Second World War
Glamourwelt Berlin, Vol. 1: Berliner Operette mit ihrem größten Stimmen (Berlin Operetta From the Weimarer Republik to the Second World War) (1927-1941)
Glamourwelt Berlin Vol. 5 (1926-1942) From the "Weimarer Republik" to the Second World War - The songs of old Berlin
Chronik deutscher Filmmusik - History of German Film Music, Vol. 2: Melodie der Liebe (1931-1933)
Mit Musik geht alles besser: Lieder und Melodien von Werner Bochmann, Vol. 2
Sophienlund: Mit Musik geht alles besser
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395e4d3db1675d6e279bb0c0dd6e68f06561772261155f20f0694c32601dae39. 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/DEL111300371.
History of German Film Music, Vol. 4: Es leuchten die Sterne (The stars are gleaming) (1937-1938)
Der Mann, der Sherlock Holmes war: Jawohl, meine Herr'n
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490a16040915321378f345f80c27a44ad0d304218a317823764f740411ee3edb. 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/DEL111200140.
Icons of German Cinema: Zarah Leander in Stockholm, Vol. 1 (1930-1953)
Opera 125 (Stars of the Hungarian Opera, Vol. 1/4, 1884-2009)
History of German Film Music, Vol. 6: We Make Music (1940-1942)
Highlights of German Cinema: Lizzi Waldmüller (1930-1942)
Die Goldene Ara Deutscher Vokalensembles (Recorded 1931-1941)
History of German film music, Vol. 8: Tanzende Sterne - Dancing Stars
History of German film music, Vol. 5: We Dance Around the World (1938-1940)
Man müsste Klavier spielen können” – Die schönsten Melodien von Friedrich Schröder in Originalaufnahmen (1937-1943)
Immer nur … Du!: Man musste Klavier spielen konnen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe8f7aa90f9099a780ed8a269571c5cef94ecac37f19cec0774821cbc4ccb0b. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEL111300097.
Immortal Voices Of German Radio: Rosita Serrano, Vol. 1 (Legendary Recordings 1938-1950)
Dites-moi je vous aime (Tell Me You Love Me)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e045f2496b95e9afb4ecfd144c43c8bd612a7f528c2c78836dd0ee4702833f. 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/DEL111300174.
The Richard Tauber Collection, Vol. 3: Songs from American and British Films, Musicals and Operetta (1935-1947)
Wagner in Stockholm: Recordings 1899-1970
Verdissimo II: Great Singers for Verdi, Vol. 4 (1911-1948)
Singers of the Century: Tito Schipa in Spain and South America (1925-1934)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77e4a74e7fc557d26bdf5a116270b7cffcff15a2924ae46d39dff91b60e927b. 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/DEL111200608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f405e07424a7bd4678632ec6c75c41c0b11284dd5137002da3b2670ef6d333a. 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/DEL111200610.
The Richard Tauber Collection: Vol. 13: Popular English Songs and Ballads II (Recordings 1932-1938)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcb4a0fc51560c827b9cbb6154a3db5101ecf469c7e64de1a7a393eeb060726. 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/DEL111301345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182bef63e9f000bf95aa5838db74866f597f4e1523fe4b9fbe278dd186a1c51e. 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/DEL111301353.
Il mito dell'opera: William Matteuzzi (1980-1999)
Il mito dell'opera: Giuseppe Danise (Recorded 1917-1931)
Cello Concerto in C Minor (spuriously attrib. to Johann Christian Bach): II. Adagio molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa822cae838a05972c6e82e4eb8c57bd2ce79057f6e7ce43c3ddfffe64ff9f6c9. 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/PLA169728502.
Cello Concerto in C Minor (spuriously attrib. to Johann Christian Bach): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222e7ab79686e51952a551e333f7794b495b818869223c077fb42466558a8444. 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/PLA169728501.
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
Cello Concerto in C Minor (spuriously attrib. to Johann Christian Bach): III. Allegro molto energico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa3bc9465d2f11bcebca2df7e5dbc506122637421709bf36400492b0e1b73c3. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/PLA169728503.
The Richard Tauber Collection: Vol. 9 - Early Opera Scenes II
Leonard Bernstein: Historic Broadcasts, 1946-1961
United Nations on the March (arr. by J. Langendoen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc8698db95745d2d500a1916e2270e71186d7707397e10bc9ca317921d05b62. 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/USA4A1202191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ffacaa9ff8fe5ecfc0a9d609932c3e0524dba88b4b12b66d5feebc35d943c3. 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/USA5R1319909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f0b239e0c932b7dd65733e2aa493124c1319aa9a548a554652d08e677512fb. 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/USA5R1319901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa213bcc323e6a128d602340ba24acecd9cd180e90a37d135653cc1bb02a4891a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USA5R1319910.
Szymon Goldberg: Non-Commercial Recordings, Vol. 1
Violin Concerto in A Minor, BWV 1041: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4145a43ed07da815af93d13ef0b2dfa67865f7b87226078ac8bfef3d2ef539b. 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/USA4A0900003.
Verdissimo II: Great Singers for Verdi Vol. 1