Chaine St. Aubin Downer Jr. (born July 6, 1993), better known by his stage name CJ Fly, is an American rapper and producer from Brooklyn, New York City. He is a founding member and the oldest member o
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 0x3ae7ead8ffade95030f81e3e98138d6e9cc1ed0c8f70fb958db31d084cab4fe6. 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/dd300666-9b00-4785-9914-f4a194c735ee.json and https://artists.proofprofile.net/proofs/artist/dd300666-9b00-4785-9914-f4a194c735ee.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 0xe3e618950c2ebaf910ed5dfb22dc2bc2a02834de257a39bd903dd219bbe3f103. 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/ZZOPM2001917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca649ad8a5e965bc2a0aba8681c768110a4e61b629d23d4b83c633f2b90cdefd. 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/ZZOPM1901407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49096f294983e5b50bd5533135ba456c7b94b147022e4a4d67cdbcf763f7322. 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/ZZOPM2001919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92836d27b93998b66e45d0ed4884f6f9aa0ba6ac0b5b893b424237b41b046ddb. 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/ZZOPM2001824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095313f174d37dd59376c95113e175e07bc0daf17644188916495a26c92036b0. 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/ZZOPM2001920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831fb7ac745d276ef3ebb90ed7bc51803b9cd4728935e23a08592fd8a50f7631. 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/ZZOPM2001921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ff83849945de4e8f6bb0c4fcd47ae7598f38e54a3a73248e7cb6acbdc7d147. 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/ZZOPM1901667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57fcae5fbb8ed11efc56a1548f11a6e28ba5692b28866822158e8acc5edf950. 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/ZZOPM2001922.
THE PROS (feat. T'nah, Chuck Strangers, Dessy Hinds, Dirty Sanchez, Rokamouth & Nyck Caution)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579ff0c7180c52f986191603c7fc387c0369de295c06a4840e2b19665266b937. 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/ZZOPM2001926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4399dc5910a90f4a75018b7a35e2d22cc02448e9465dd1aab2e7fc2feef48b53. 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/USUYG1202489.
It Ain't Easy, It Ain't Easy (feat. Nyck Caution, Kirk Knight, CJ Fly & AKTHESAVIOR)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024b8d2e0eaacd5cac7b1685a7cc3b131818378bba28bd610181b8ceca5158d3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USSM11903525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e11d6b42005cc526da649dc6b9bc91d619832574511cf91fd429a48b638142. 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/USUYG1202502.
Problemz (feat. Erick The Architect, CJ Fly, The Underachievers, Zombie Juice & Nyck Caution)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3718bf339b1aed1d3e45d499124706101637974b0ae32aa8955759094fceae. 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/USSM11903528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617318494f34b70f8c0db88b81dd360c1900d0597c169a9cc81f2ca7bee148a2. 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/QMKSC1700118.
Left Hand (feat. Joey Bada$$, Flatbush Zombies, The Underachievers, Kirk Knight, Nyck Caution, CJ Fly)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272f4fce74725861d9f033a6e9e7a45f0972ebad4195af3ad9b188b9231cfd14. 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/USSM11901473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78d989be3437d71864c149b7df49a1e44cb2434e88161a3d86c67fca9bfb871. 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/QZLBC2306723.