Eugene McDuffy (September 17, 1926 – January 23, 2001), known professionally as "Brother" Jack McDuff or "Captain" Jack McDuff, was an American jazz organist and organ trio bandleader. He was most pro
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 0xb5e99fbd3d6f208fea5ff7ca8bfbde1807f1d569fc7350bb91996560dfe1abc0. 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/0cc409fb-ea32-412c-89db-4697d44822a6.json and https://artists.proofprofile.net/proofs/artist/0cc409fb-ea32-412c-89db-4697d44822a6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x9705f18e9260a99a93f7055a0a2be6c4a9defe8fcc7047f30af2730f1ab7d2fc. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USAT20109485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43122aac46de49f498d5832750ce95a22804f8674885f9fb34ec3b98cdc001f4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USAT20109486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc31de1736c305e64337983c28e0aaec34c9e91c650cb9f46d115f168823ec55. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USAT20109488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea00de6d10d6d9a5447e6987699ce01d19b5e0b2cbdeae7b28ad1b602aa96b5c. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:39:27Z), 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/USAT20109493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08aacbd481fe835f056c0a0adf934da69383f2cd182811fec037d69eb5678c0. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:33:27Z), 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/USBN20200073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676839ec629ac53b0d2658b69c7350b8f2b7a390467729f89caa2807ba62d20d. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USBN20200074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe710db261db65f581b299720f1557030d29f67e57c9e6dae23c0fb21369907fe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBN20200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105fca3cf308cd9b44fd40747c0c03ad72bc90cab1aa89a95f69eda465129442. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/GBXHC2039840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e4e2477b496b170ac46eafa2b2e614ab071c1e939f11cc0b68d4d0599a7b43. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXHC2039841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3d5e085e9b4f912f498b37803e334227af8552002883e36e455908e802426a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBXHC2039847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519c29cbeaa83f2ad5bd44a39af7abecd6ee229ce5bc448f5c0bea18c3bdf958. 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/USC4R0301876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35726da122c302b1e6b6fb782db510f4c0d87fadf2fd29fbbce43ec42c5a6783. 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/USC4R0301882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35275197bd818dd11fb053475653b323f0aa0c2b0424496e6e5238e2c3139937. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USBN29601129.
The Honeydripper (Rudy Van Gelder Remaster)
Lifeworks - Jack McDuff (The Platinum Edition)
JAZZY CITY - Club Session by Jack McDuff
Jazz And The City With Jack McDuff (Digitally Remastered)
Last Christmas I Gave You My Heart (The Hit Collection)
Merry Christmas with Jack McDuff [Remastered]
Brother Jack Meets the Boss (Hd Remastered)
Jack McDuff Meets Soul Tenors: Willis Jackson, Roland Kirk, Jimmy Forrest
After Hours in 1962 the Blues of Brother Jack McDuff
Feliz Navidad Y Próspero Año Nuevo De Jack Mcduff
Blues in the Night / Another Real Goodun'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d753b6b27d72410fcff4446a423fd72d1b9b2e61ddc73fcfbbf4140c222b5b9. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:37:11Z), 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/PL44J2515858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbcd7cf00a88a21438645e83e5e64a23c1466bdd34a5e7b63bb1efaf9320959. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/PL44J2515861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ecabc611701c84e37291085347cc2f5d4288e3c87ba032c92b72fa70882117. 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/USBN20200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cac552769b25460d7b4d0de392b8a943560f9d11dc8063380bed0d97ccc1fff. 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/USBN29701067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc78db7bc17c869cdf72f9675fb0d1faac3503fffb6037dbd2aa71181a64cd2. 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/USBN29500442.
40 Tracks for 40 Years: Delos' 40th Anniversary Celebration!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba81136bb850c93ee414fcd82543d1a3230a645e10429b42576d4003e0acfa4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USASX1344023.
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