Arthur James Kok (January 24, 1902, Czernowitz - October 18, 1976, Berlin) was a Romanian bandleader, violinist, and arranger. He led dance bands that played light music and jazz. Kok learned to play
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 0x3c108c435bafe7c211517c3c91891363c0bc863a06d324f7786cce4b41472fa6. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b326d6d-113e-499b-9e3e-26b096fad867.json and https://artists.proofprofile.net/proofs/artist/0b326d6d-113e-499b-9e3e-26b096fad867.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Es gibt nur ein Berlin … Die Lieder von Willi Kollo in Originalaufnahmen (1927-1946)
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 0xbbbc5c40f4041608ba7f3ffc6c1166e36a6e2396e43a50a489b6931230ccadc2. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEL111301196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08b5e84765dc4a2158bafaa49842263f6d5fc3b5aab9dc1a7fc8ee49e3b7f6b. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEL111301198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57461019723e70b05a174c2d4fa93ac0a17c0421abd9ea9ae2a934f30f2db9f9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEL111301212.
Wir tanzen um die Welt: Einmal wirst du wieder bei mir sein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c4abc419091a39c52f57e2e6012a72f234b139d500a45b49d66b999eb5831b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEL111301215.
Zwei in einer grossen Stadt: Zwei in einer grossen Stadt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1e24f2ea55f16304874f12da191da70af4180eeaf92eb784705d4616986514. 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/DEL111301216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71ffa90c53ac13bf7e101a758dfacc98a7a02347238d2bbcd9cfc3d8a98921d. 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/DEL111301218.
“Musik hat mich verliebt gemacht” und andere Gerhard Winkler-Hits (Vol. 2) im Originalsound 1935 bis 1941
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985262e0a6d4e591825e3b3afe2080a211fe817375fb12b02813ce05c64de339. 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/DEL111200838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7c03b4c761a854785e330e84dd96b8dae25589c80bc63824c030038703dc65. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEL111200848.
Tanzdielen und Vergnügungspaläste, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7dafad46bc2cb44b6e153106fc38d16b18ed350454271e8c7dc1b3e13aa546. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DEBL60539210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b1051a473d9c8eeccc520e08bbb6e279637ca3ea3346de69898da41d5d4888. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEBL60539211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbd621ce6bf343fa6b849b77d3f7e5c50b54cf03b25ff447e7c64b025b011ca. 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/DEBL60539216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b0ee9da18b77af105cdde6a2502b560af67110ba78a46f7424bacb91627d78. 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/DEBL60539219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec22c4d7b308ddb29a28114901bd20d6307d93a9d8521fa0a25f00f1de775b80. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DEBL60539222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767806e1c81efe4df71579b71e2291309e0d493d10d151b80220618695a8c718. 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/DEBL60539232.
Swing Tanzen Verboten - Unerwünschte Musik Vol. 2
The Golden Era of the German Dance Orchestra: Wenn im Tanzcafe Musik erklingt (1934-1942)
Berliner Tanzcafé (Das Beste der Deutschen Tanzorchester)
Tanz und Swing in der Mondschein-Bar (Das Beste der Deutschen Tanzorchester)
Goldene Zeit Der Deutschen Schlager- Und Filmmusik Vol. 8 (16/20)
Grosse Orchester Der 40 er Jahre - Orchestras Of The 40´ies - Big Bands
Schellack Schätze - Treasures on 78 rpm from Berlin, Europe and the world, Vol. 42
Die Besten Schlager der Goldenen 20er & 30er Jahre, Vol. 8
Die Besten Schlager der Goldenen 20er & 30er Jahre, Vol. 6
Bei zartlicher Musik … Die schonsten Melodien von Gerhard Mohr im Originalsound der 30er Jahre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2511323d7ed52947673b46f0200c76bc299fb590a893a728bcac191a24b8105f. 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/DEBL60489545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42c2a9648fdbea485266abb02ff88678b6feeccf4ac26f8a8d9605a66439143. 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/DEBL60489547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5378181c3e27134db3e00024e108ee08a063dc76cc6707249498cab3dbe5c8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL60489555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574f3b637b3e974d5640e181b77b027fe5007148d10a4fb3da5ef567dd409d27. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEBL60489565.
James Kok / Die Großen Tanzorchester Von 1930 - 1950
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe510afc4f8d72755b1cd8cf5967310c9acdab4616d72725c9325e41a5f18bc43. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USA371125849.
Die besten Schlager der goldenen 20er & 30er Jahre, Vol. 9