, born , better known by his stage name Nujabes (; ), was a Japanese music producer best known for his atmospheric instrumental mixes sampling from hip-hop, soul, and jazz, as well as incorporating e
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 0xfcc92496883d165d610fbbbae22d1928a856612be1d5f2c6b082e1d5a3283f95. 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/37aa030d-fe09-4a67-9d6a-5e434f79d69c.json and https://artists.proofprofile.net/proofs/artist/37aa030d-fe09-4a67-9d6a-5e434f79d69c.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 0x6147315f57cff300b09e43099c915a581dd2528bc74a9e0a8c6011c89d8a663d. 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/JPH492305014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ec28a29d07831c42c05f888bfd0ac662d2c888fceaaf3c085a94ec2225fae4. 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/JPH492305015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715b51a848b68479fa8834f5ae813236b39e3697b87ad52c14ae3699135cd5ff. 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/GBKPL1786721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7390e4f6afae85e0c276bc331b22c4209b8b728b8b5db6efefd80484e9b21b9. 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/GBKPL1786717.
Feather (feat. Cise Starr & Akin from CYNE)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30333173227e6948868ba5282fbda95f8638303e3e7728250a9de31bc78756f0. 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/JPH491605000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddab5951b21dee5f45ab2e08f2ac6d203c04d789c87a3bbcbc76671dd94f2e5. 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/JPH491605001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0bb3de5cf5d6e4ff96df805f395885fc545632ef9364af0363bb0bc71a422f. 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/JPH491605002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dffe801f91257740b8afd8d646d6a1ae3babdfbb829a976f1e126d2401bd320. 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/JPH491605003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6a39d670cacad8170aaae62d695c3f7c849f3572a53644c3c1f49ff3cfa128. 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/JPH491605004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa43b6a3de903a47b653810ef0e3812348baff65e6488bbdfaaeced8ade883d. 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/JPH491605005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09dbd2aa6a416cbc3c23470827443bb2649687039b606ac0f8cbad76a18990f3. 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/JPH491605006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280b82e8436870c6833862c731e0f015799331633e37b5a9b10e571121f37df4. 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/JPH491605007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448160164ddd5c3c3776b257e33903a99dabfabb378f4c9a4f5754aae0c7335f. 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/JPH491605008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff6d505b660de01c2e3741827846d3e115fd1a6a633659f1d95e1ed3a2e0dfc. 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/JPH491605009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff17eeeb037700b7abf0d010650155289f9f44fae0a3252215ac919e3cfab0bc. 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/JPH491605010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28cb68469aa4d3c433acef66fd7d0a06a6473220bdba85478e7fe09698699c3. 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/JPH491605011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa628b0ffe2481a9d438392c046848e3d0f162cbc7f2aea09926edea983a44e39. 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/JPH491605012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ca7fdf0cab7a49eb5c94ea999f1194fc049be6eb700087683561dbd2166cce. 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/JPH491605013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d0846ab496c979c078d38d394901d0f114fe4a6d1466f44dc56bdd0f702221. 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/JPH491605019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714d875bb23a3ac86005162cbe7ee4c942a384eec70e1379ee5d88e9507a1ceb. 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/JPH491605027.