thumb|Wilhelm Grosz Wilhelm Grosz (11 August 1894 – 10 December 1939), sometimes credited as Hugh Williams, was an Austrian composer, pianist, and conductor, who from 1934, worked in the UK, before mo
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 0xc1835950cdb89e232864457fef84f6c50579cbb907021d8d762005b9879cbcd3. Chain 2 (Bitcoin): anchored in block 954004 (2026-06-16T21:01:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32bb6f4e-226d-4f63-bd51-c313913a9366.json and https://artists.proofprofile.net/proofs/artist/32bb6f4e-226d-4f63-bd51-c313913a9366.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The John Harle Collection, Vol. 10: Berlinermusik (The Berliner Bands 1983-2013)
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 0xf0fd2b9cecb7a29562fe3b0f222d4081fd483111270c7dd8813f0c3380b6b73b. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/FR6V80763906.
Blue Sky Swing - New Music for Flexible Instrumentation - Demo Tracks 2019-2020
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1954bd968826861766b1d01c9530e3251db7e1a03bf51b69bad90a430d8f3454. 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/NODGN1904020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ddd93b5c60e5290b7b144988b19d8e2ca8a0aa20e5137ab463ef528373e3f1. 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/NODGN1904050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a8a86838c7fb37a13897e81493266c2f670540d7fdd71ad3617f2b94cf8402. 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/NODGN1904280.
Don Cesar: Komm herab, oh Madonna Theresa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92dcb016baae57c31d79f1286592fe51409b386ea2e5c583ca9589fb712a2d30. 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/DEAD60401708.
Joseph Schmidt: Complete Studio Recordings (Remastered 2022)
Carl Loewe zu Ehren - Aufnahmen von 1902 - 1970
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55af51b8186959adbf40b00068129d7a394334e65305498f5921b17ff26bea99. 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/ATP139623027.
Kabarett der Weimarer Republik: Max Hansen – "War'n Sie schon mal in mich verliebt?" (Cabaret of the Weimar Republic) [Recorded 1927-1934]
European Swing Giants, Vol. 7: Berlin and East Germany 1947-1948 (Including 6 Titles from Rex Stewart’s Hot Club Berlin Session 1948)
Schellack Schätze: Treasures on 78 RPM from Berlin, Europe and the World, Vol. 15 (Remastered 2018)
Joseph Schmidt: The Complete Recordings, Vol. 2 (Recorded 1930-1932) [Remastered 2014]
Schön sind die sterne (From "Der Liebesexpress")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9442d039c919fb4edcd89427296981e2554c0b26ab9e8a8992bbdf62b61439cb. 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/DEL111400328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8991507c5621c16ad6b8ad24e016991952cf61794f58c5d7d41ed534b44d6d. 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/GBF079642116.
Lombardo, Guy: Get Out Those Old Records (1941-1950)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fbe4a077f6f0a201e45ace52d5e1bedab03d5158a259cf62e2a3c4705b6a16. 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/HKI190216202.
It's Love-Love-Love: It's Love-Love-Love
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26946784736ab098501ce0986a7332d6ac69cf5d6f6b028ebcfcd95ee62f3134. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HKI190216203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6749d86768ae79b0e077845fb2686213f9b3ec50bd3586e99735bf12e9140a8a. 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/HKI190216210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8bac7ef017a5403cb7a4ad57f0a967f2de696908f36ed8d1fa42a6561d5ba1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI190216211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92fb6e439767de2f0ce2e7860720c7b476cec48c938a44ecaa8ec965679dc30. 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/HKI190216212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b9ee35da8b4944c68d3873598a360d3b4ed04ef9e3e6434e0f756b039dae21. 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/HKI190216213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2050dcddddda44b4b1e030e4e2abb741b797643d10257f6d9cfcb87d3c0f4e4f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HKI190216217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc7261f10b0b0488038b224afe03be833bcdacc97e397442caebfcd1b854b95. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKI190216219.
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
Tu, Tik Tu (Valsai, Tango, Fokstrotai...) (You And Only You (Waltzes, Tangos And Foxtrots...))
Paskutinis Sekmadienis (The Last Sunday), Tango
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9756d43a8f6bfb48ae2e786013c57757ff72635cef1c64a93d70f7efa12c3a. 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/LTA749900004.
Tūkstančiai Žiedų (Fokstrotas) (Thousands Of Blossoms (Fox-Trot))
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f23b62ea2f9a042563a69199f50589d21351889009fe128cc9bcaac5b3e35a2. 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/LTA749900010.
20th Century Foxtrots, Vol. 1: Austria & Czechia
Kurt Weill: Die Dreigroschenoper (Berlin, 1929)
Hollaender: Guck doch nicht immer nach dem Tangogeiger hin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb98d3dcc68e758e53b9c44a2e63aa3a2e8f9c11c5cef354c72941e0364434b. 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/DEA800200126.
Mein Bruder macht im Tonfilm die Geräusche
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e1bcc4e5ad43ccd6dd3f228a88b9d44f515fe854badb8653ee24324cd66ae5. 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/ATP130466204.
Musical Moments to Remember: Greta Keller – Diva International! (2017 Remaster)
Modern Times: Songs by Schreker, Gál, Goldschmidt, Eisler, Korngold & Zemlinksy
Masters of the Spanish Guitar: Alegrías Flamencas
Ellington, Duke: Duke Ellington - The Forum, Hamilton, Ontario, Canada (8 February 1954)
Vocal Recital: Oelze, Christiane - Grosz, W. / Ullmann, V. / Korngold, E.W. / Weill, K.
Edition RadioMusiken, Vol. 3: Plays & Opera for the Radio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e6777c3ad5885a305dc1cca272c8e2aac1449029e3de2a3e1a68b1bc13d349. 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/DEL111801281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a08b6ae7aff058fbc7f614c3a6a49acf94ca17bf9c0990e39c2a18777731ebf. 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/DEL111801289.
Wenn nicht die Hoffnung war (Remastered 2022)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e347e1259693e71517a923bec931d4a5037d974e18f8da3b3ccd534faf1f312. 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/HKI192419513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ef3ed99960a821b59348c09f48450fa5d7694b0f780aa2635ff04a9c4ccc9a. 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/DEB162401384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495f63a482a58e4891c1292715c7fa8276d3753da006430dc5af2d9d0043988d. 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/DEB162401387.
Das Lied von der Erde: Mir war das Glück nicht hold - Der Abschied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e680ed4b7fb31565b25ffb90df87489c2997052a8c12ab151929fc5b7c030cd. 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/DEB162401379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec8f018862244092953d440e9f65ebd318f0ac1b766ae08cf1382fe2e389a74. 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/DEB162401382.
Kinderlieder, Op. 13 No. 1: Schlummerliedchen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e5167ac9363b424e3f41bd03abfa6bb08d65a691211abe87d463b1dc9199fd. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEB162401373.