The Underachievers are an American hip hop duo from Flatbush, New York. Formed in 2011, the duo is composed of rappers AK the Savior and Issa Gold. American record producer Flying Lotus signed the duo
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 0x9c1786f3c052e485bca5d249c81e931bcb86d0ac7eab9437788455ad2d423cf9. 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/aeeecf11-1765-4d42-9b15-4f800b9fb942.json and https://artists.proofprofile.net/proofs/artist/aeeecf11-1765-4d42-9b15-4f800b9fb942.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 0xeb7197c24df14501c3c9b74341d3696b0befc741c7b72dc18013c358a2eae17e. 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/QZPEW2462657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5052ae01a4372f311e618e6f401d3340eedcf6ca95a4edb4e6335f9e78aa97fa. 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/QZPEW2462658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91cd4ed37b5004923dd0dfad4fd4e3f69b4f49c626c6f502e39c9e817dc6145. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/QZPEW2462659.
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.
Bones (feat. The Underachievers, Nyck Caution & Kirk Knight)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43576d66d3e5a6299699715c3b071d9468b9c4bea809d8a46b35945dce4e7bbe. 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/USSM11903512.
Left Hand (feat. Joey Bada$$, Flatbush Zombies, The Underachievers, Kirk Knight, Nyck Caution, CJ Fly)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272f4fce74725861d9f033a6e9e7a45f0972ebad4195af3ad9b188b9231cfd14. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11901473.
Pull Up (feat. Joey Bada$$, Meechy Darko, Zombie Juice & The Underachievers) (Beastcoast Remix)
Pull Up (feat. Joey Bada$$, Meechy Darko, Zombie Juice & The Underachievers) [Beastcoast Remix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b03f22b1ec62d4d2c52af76b307017a7db3ccc23c24eb7dc9c6705d8b4eb2e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMRSZ1801830.
Pull Up (feat. Joey Bada$$, Meechy Darko, Zombie Juice & The Underachievers) - Beastcoast Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b03f22b1ec62d4d2c52af76b307017a7db3ccc23c24eb7dc9c6705d8b4eb2e. 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/QMRSZ1801830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b03f22b1ec62d4d2c52af76b307017a7db3ccc23c24eb7dc9c6705d8b4eb2e. 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/QMRSZ1801830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee05799194954bdf9fe53ff79de48027bb818c071d9c4f78fd2ca22a49088d2. 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/QM4TW2399571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c708b9bd04bfa98f38469ce67552672909283e7549692c36e36b409ad571b72. 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/GBLV61640843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb68593efa97215c0efd27b48da098f7891b601ca35f1c17db615d2c1231c037. 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/QZDA72094835.
New Brooklyn (Remix) [feat. Flatbush Zombies & The Underachievers]
Peter Rosenberg x Ecko Present: The New York Renaissance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292dd373faac21a1bc9c818cf05384718aff59df7464cd3ac3d29d0dbe63934e. 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/USLD90805026.