Joseph Robert Saddler (born January 1, 1958), known by his stage name Grandmaster Flash, is a Barbadian-American DJ. He created a DJ technique called the Quick Mix Theory. This technique serviced the
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 0x7916f82a0038f08b248d1704a47aee6561b8cdc026c63360cceb2567ab1b7235. 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/1c9bac5a-fbd2-42b3-8bdb-5c846a1b3364.json and https://artists.proofprofile.net/proofs/artist/1c9bac5a-fbd2-42b3-8bdb-5c846a1b3364.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 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 0x30d3b3091cc083c3bafb3c5309c8a2ff07037e16ba2f345a2884dea24eb4252a. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/GBAJE0401786.
Message From Beat Street, The Best Of Grandmaster Flash, Melle Mel & The Furious Five
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffaf92c534b62bf582e987269699531e70c9e516f7ca79b567ff98fb506cfc76. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USRH10283757.
It's Nasty (Genius of Love) - Single Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e6d4c8520f7d91b169acc4625f1a572f55969e30193e94f45fd441b7acac83. 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/USRH10283754.
The Message (feat. Melle Mel & Duke Bootee) - 12" Single Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8e3dc122877f5984e053e990c97df028b19f3b03631912a3e0df19119b147e. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USRH10175383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9943e1ad2fe5b4b78d4681e06d19259d047e506e7a6cda284708409450db953f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USRH10171094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d817c39108c7a92788114697a5564ab0d85e23575853dfa7a55e47592877593. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USRH10450243.
The Adventures Of Grandmaster Flash, Melle Mel & The Furious Five: More Of The Best
The Adventures of Grandmaster Flash on the Wheel of Steel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f985f903864fcbf18b4e1b3f5523f8cebf7dfee917919db3929cd62efcf9ff. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/USRH10175385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa13fb36b3ff24b2f5f423b9039a41977049b75ae0712ce7ea3886a1f5e1dd07. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USRH10551048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfd3e98d04406f70591f19b102c8c2b7709a9c543e232e5936fa4ca2bb7516a. 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/USEE10500182.
Grandmaster Flash, Grandmaster Melle-Mel & The Furious Five: The Greatest Hits
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf88f589d2e67ba37b919bf000d9de795627d0a490259b0593f92a721f63f603. 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/GBAJE0609104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e1334440bacc799a438b9d1371eec3b03bec74b8b60b02f1f021d72539940c. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/GBAJE0609106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09bef156e478318fab39b6675676b3848a93bd64e5b19fc66160a61e72ca0990. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBAJE0609108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519f51116ca693e7f6aab59ec4271a6c15dcb43084d5a7c1075184e3af5340bf. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T13:53:31Z), 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/GBAJE0609109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2cff8c97076d039ac7d5799c93677518b7c9fc9f6ba7e6686182539763cfdc7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GBAJE0609110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a77af27d3b35b80da0bdc76f946f1db13695f01f09c1c7934ec2ab497d7082. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:05:59Z), 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/GBAJE0609112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eef8c9abd41dbb578532a0b721e176a01d908ad01edff4e47b49f6936d166b6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAJE0609113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6f2b7c1517b9a88b2cebce9a1ab54ba1c2979b7b5a78ff9875cf5163319dd5. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/GBAJE0609114.
Swagger feat. Red Cafe, Snoop Dogg & Lynn Carter
Shine All Day feat. Q-Tip, Kel Spencer & Jumz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd4b4891c74ea0f376b57c39b173a77ec0c7654ac4ffe85ba1322beeaa4511f. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/DEG930940029.
We Speak Hip Hop feat. Afasi, Kase. O, Maccho, Abass & KRS One
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254fe63f6b8cfcd7aef8e9ff138cada5da23bda033ed8ded792a5a33d13adb19. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/DEG930940030.
Here Comes My DJ feat. DJ Kool & DJ Demo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d66100066c9340bf8c2e57298a03851b04d04a069eda04864cb10e47effa7b0. Chain 2 (Bitcoin): anchored in block 956777 (2026-07-05T11:01:08Z), 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/DEG930940031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52118ce332bd115888c23838a2db262e2e33bd72386b63310bbfe445dcc0426e. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/DEG930940032.
Swagger feat. Red Café, Snoop Dogg & Lynda Carter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5042261319be468d4f625be4c6585e2142c6301363dd4471195893713aa9b53. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEG930940033.
Tribute To The Breakdancer feat. MC Supernatural
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ce1c8fa9b8e710f157a38e7f70908d8b7609bae4ee827bb1277fc977122cfd. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/DEG930940036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070ab073a736e9708f9024a8a242c5fc783660368c2a58633b8726fcac402736. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/DEG930940045.
Shine All Day feat. Q-Tip, JUMZ & Kel Spencer
Grandmaster Flash Presents: Salsoul Jam 2000
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb023485f00fcac51853f91fdd86d52adbb09b71492f10cead6062626b2bdd479. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QMRSZ1600882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2314c3af72b270daa1edc131999ab2238ca21acbff9dcfae93b99a7a7a82d128. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USSA49210023.
101 '80s Hits - New Wave, Old School Hip Hop, Hair Metal, Pop & Rock
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e3aab37bdab5471a8111565475403b0a9cc1b1a5dee62d62a38396379e4b67. 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/USA371121927.
White Lines (Don't Do It) [feat. Melle Mel & Grandmaster Flash & The Furious Five]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8758f20a0014db517d3d068c1c6b7d72c0d1e1a44bd069b73393c731c80cdcdb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAYE9400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612c38ff7544447bec2ef483d3283b8942812707de3dacc7ec0da71d4821e481. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA371359276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9029b6f3481e5c7cf690d4887848e58b1670c173b5f724f613924f5e47f4d2d. 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/USA561418626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83bbb6bf4d49b0e683ce48ecb1ecf47df547f4390429b21ac10124c52372320. 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/USA371122431.