Nefew (stylised as NEFEW) is a multicultural hip hop group currently based in Switzerland. It consists of Polemikk (MC, producer) and PA-Double (DJ, producer). Nefew is an acronym which stands for New
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 0x5661d32bc30510ece42bb04c4defad14c8b402855789d5edcf764332c2e2c031. 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/b2db8efb-e64c-412c-95a6-59529678ffb4.json and https://artists.proofprofile.net/proofs/artist/b2db8efb-e64c-412c-95a6-59529678ffb4.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 0xc837684fe29db1f9288d93076618ac9392a6285530cd3741036e7b394efe7a8a. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/USUYG1162601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c901d696559c7b62cb46385dfff11a1148fc3876c04a3564c1d93d75ba3006. 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/USUYG1186119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acaf8c44d9b03b306e340c9f828b137215c59b4868ceb9f6ee9d7d0f4e36f79. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/USUYG1186123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bf26ed9a1245a19a6e6d3b64935fa86b4d9c1d0911b6f08884fb6e2baab63f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USUYG1186116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ed8d15bc9e15582eaccadc8a4031d2b5a14271d2fec43beaad279197b41710. 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/USUYG1186115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf8be881fd18a1a8e10c2c334e2b5c765c93d5ea2449465845c55f11e7b528f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USUYG1186122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f4249e5034f0ac650fabfd9c351a0eda331cae3e212b56bbe8224493e04c2a. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/USUYG1249300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995a49b9623a6655ad6c82297a22c1cc5a62d54c0297735f13d5154be0889b62. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USUYG1249301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d768659d60bf6b740cc7f4690ecf915956f3942a08c5a44aa9730006db2aa3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USUM72009254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d84d65ba94c39fbac8115be1faf99e55afc7f97570e3abf2195a7900baa14b. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZTBB2211677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7414a08aa392166e5dcd5b7058c9ea29a413799c927cdf7e6f8d524531bdd4aa. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFZ32375153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494bb6ea51811ae15cc4aa00876819d784424980a49b9d247d644dab9c087ec6. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZK6Q2310679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e78f1aac4a91ed4005aff6f69ee6d4e575ea5b2a7a704ef5f50654f6e3d04c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWY2328255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a5b3ecfbe3057be8b83ced9372cfa128ffb4676a70913e08d11a2af1ff1b36. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZTBB2375767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8acb3ee8855e6a8ba4c38581aae0a438f7642577117dad40f7c7886828f698e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN72465764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f59c82f5d7a27f86e4e1537b31e0f34190054f6d023a4a1c25ebac604ac76a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZHNA2438786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18ec3e8dc2f02604941e7683b39c91db6acdc69f242b86ef3e409337d3a833d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTBF2459148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f849ad902ea1a659c7561c221c228f1df39a6ddfd4409b4fcddb8e6eb44f9a6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA82591192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2554fe86ee302ca72d03508cc1d3b9ecbe65dcba4a923a569377aa95ffcb389d. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZMEM2519909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e4dc8a71adecab193636621e068301eda20211f3ff2d1bcaff26999d89986f. 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/TCAFR2111584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2210af95351b73aa603cd732fbb9ac8747e0afc040a3e59596b1ecb5ac7cbec. 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/QZ4JX1761029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11259149f39b074588b5f1694ecf54f802ce4b5ca6f734c8526d6b5c81fbe85. 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/QZMEQ2425818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85fc19e6e3ab60206229990f9b99cd1c07b22aca457d08d06dde6bf139f4c28. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ5FA2050476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f399ac4bb6d240f709d5d2d88709479561a63c812d36f72db5e58ddd6b134f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZW9L2279247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe672f7d0d1bba3fc39a67cf2c2b27426b12f2cab4ec661bc70d3a549153c584a. 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/QZNJX2382984.