William Thomas "Champion Jack" Dupree (July 23, 1909 or July 4, 1910 – January 21, 1992) was an American blues and boogie-woogie pianist and singer. His nickname was derived from his early career as a
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 0xf44ca8da74f9d24f85c751f580ab8a3648fb71130b9bce0a8dc57306254d4943. 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/9e88c677-efb5-4d21-b61d-f06385d9242e.json and https://artists.proofprofile.net/proofs/artist/9e88c677-efb5-4d21-b61d-f06385d9242e.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 0xd1d65e8409676f5eb9f7ef375eb4e74949cd4baa01b96e0d281f30378655af0e. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:36:54Z), 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/USAT20003205.
When You Feel the Feeling You Was Feeling
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0649794b0af50b199c2e2e17b008bd0577a32e0e04c78c7f25ced698cd2a9cf0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USACU0508259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699bdd4a904805eecc54a60a13a8df2b337ee1309dc70822eb3a61fcd9a543f8. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USACU0500277.
The Blues Of Champion Jack Dupree Vol. 1
The Blues Of Champion Jack Dupree Vol. 2
Dupree 'N' Mcphee: The 1967 Blue Horizon Session
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc090ffeda9bad2f0a6da5dfa14a793cfcc5701d53730c5f542cae64110c603. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:29:56Z), 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/SEBFO0400597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae34f084ffd63a57eca5a7297d5c3ba1d618b12d3656c37889201036486e697e. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/SEBFO0400598.
Champion Jack Dupree - The Complete Blue Horizon Sessions
A Good Woman Is Hard To Find - From The Archives (Digitally Remastered)
Two Classic Albums Plus 40s & 50s Singles (Blues From The Gutter / Natural & Soulful Blues) (Digitally Remastered)
Jack Champion Dupree: Early Cuts from a Singer, Pianist and Songwiter Who Took Blues to the World
Bad Whiskey and Wild Women (Famous for Hits!)
Your Birthday Present - Champion Jack Dupree
Champion Jack Dupree: From New Orleans to Chicago
Blues For You - Champion Jack Dupree - 1
Blues For You - Champion Jack Dupree - 2
The Absolutely Essential Champion Jack Dupree
Blues From The Gutter (2 Original Albums plus Singles 1945 - 1959)
Cabbage Greens, The 1940-1941 Okeh Recordings (HD Remastered)
Old Time R And B Hits, 1951-1957 (HD Remastered)
The Women Blues Of Champion Jack Dupree (HD Remastered)
Natural and Soulful Blues (HD Remastered)
Trouble Trouble, Plays And Sings The Blues (HD Remastered)
Is it True 'Bout That Champion Jack Dupree?
Instinctively the Blues - Champion Jack Dupree
The Blues Collective - Champion Jack Dupree
Essential Classics, Vol. 638: Champion Jack Dupree
Dark City Blues, Vol. 2 - Urban Grooves & Midnight Moods
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02c34bb696cdf1d9646fa45acde82296b33fd7a11079a531087c1cc192e000b. 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/AUXN22529737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fc77838a7c16242370a2c6a196392f9773fd74713040160a5cca64c80486e5. 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/USAT20003200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398cc9efd9a6e3c0d26962526342eb9058f3bcf1294371f1bb254f7a81589d7c. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/FIFMF8000109.