Youssef Soukouna (born 20 April 1981 in Goutte d'Or, Paris), better known by his stage name Sefyu (, his first name in verlan), is a French rapper of Senegalese descent. He comes from Aulnay-sous-Bois
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 0x9fb278425eccfcf0b8e17bc1d569a81057bf978a44b5968b18141edc59be63de. 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/684924ab-cad7-48c7-a9c0-d7956b5cd33d.json and https://artists.proofprofile.net/proofs/artist/684924ab-cad7-48c7-a9c0-d7956b5cd33d.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 0xd84262fa87165727448639b3e8aa25bdb705fcf09571694170ac36689fd5526b. 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/FR6P10600050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cadc731616e98cd1464bfd8ed76e0d85c8f58220a704ee6e596e32570a0258. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/FR0PF0600040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed724115c7053a5ba46d9cea8c99ca38e452616469158608c05d8c0859eaca5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FR0PF0600120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2111c24f37161b1c5cc071736a8cdd40e7f482407bca968761d39438958d1897. 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/FR0PF0600150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab44fcf8249c3e92f32e61f361a1e7c4e3230b115c5e1bfd25a8a5a149df80e. 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/FR0PF0600180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968a2595e8e66dd0dc06210aebcc45f26785198e77a007e26fc176ead415a88b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FR0PF0600110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250a40e68f7fc38ab64463df2d45b3164c50baa2ca3574df3101cdaac76f93be. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/FR0PF0600170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a65ac9460d908e2939302dac3b68fcd9fa3b9a40e8485f97117810893b9b9b0. 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/FR0PF0600030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae3360cb6b4eacd3688db853873e97d86a3dc51cc82cc849922c309cd14e12a. 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/FR0PF0600090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1ee87c4b1caff98093c99ac1b401cbd3053cba602850f0c57329bb986b619e. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/FR0PF0600250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65790fda6bcd87653c290fa078149957d5c79884e28193550f7b78ee6d4e538. 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/FR0PF0600260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf213fbfb9f9dc7972668890d604782689559981ede02c0a63d21947cdc74e19. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/FR0PF0600070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bb56949e2c38d95cfc6e9bef73226d821cf594835841edb2940cd705aea2f2. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/FROPF0800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f41f9f8ac1cc47b5dd8ae90332ab1a042e3ed030392239e9120962b10226dcb. 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/FROPF0800070.
Seine Saint-Denis Style : Nouvelle Serie (feat. Joey Starr)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b35a316158970bef264da8ddf493a08a1734c51a349dd77844f37be1bb64b5b. Chain 2 (Bitcoin): anchored in block 957868 (2026-07-13T14:56:55Z), 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/FROPF0800080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5adbc724f7608c6caa07b0b8f3cfdadc96f3af697be01335c5f98107e88e5f33. 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/FROPF0800100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9ae7f06554d50d31b4c700ccfb2f842ed38c708e61941c8fd4dd1f17ae0fec. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FROPF0800110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e77bb5f7557c39b1ae11cbd906ce5bd77ee0e1bafdba604233e32851eedd7e. 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/FROPF0800120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f4b3bb5280afbb459a738649de76362bdeee1e05260f99156668461ba6b5db. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/FROPF0800130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b5b864e823f84be5f171ab21192e99730e456ac58a2a870e9ec75441da476e. 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/FROPF0800150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177ebfbe176e6a802f407eefff2a25792eb7eebf42f4fef39ad58fdb786043e4. 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/FROPF0800160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924d8b9429ffadb548c0e8608b28ecce236c42ca5814b638ff3c29135c831a44. 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/FROPF0800170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa324c2fec997a6844117d17229428e661df013067c59cfe7d495c395cdbccc97. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/FR6P11101730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b794d73cb46f9a1cd5e8872b5641c7ed2209a643a3dfd31cc7834a6264cdcc0. 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/FR6P11101750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8617fc3908c0fb99d1c641daf4edf77a75550e9d437e73c2fe161facd04a6567. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/FR6P11101830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa780c449b50d9576fb861e01f9fc2d89ddcd43468e5a280ad806324ba6166892. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/FR6P11101810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d94da108dd958f6f739bab1d7f1f780c35760d3406c26086c770e6a992d66f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR9NU1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a19f96ede29afbddc7c074b68847930ff06dbf4f5bf3724442107ef10c83ab1. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/FR9NU1900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c799f7eb0aad407d375d9c6bbdbc439f77defd5825d81099065939997114f2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FR9NU1900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb7d0273d7dcf96b65dd2a6a45e15273cad52744890b8693b9444cbb14d263e. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/FR9NU1900060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33431b5aaa7ab8a822bc5cb482a356d6a839070b10d200ae3694a1318aadece. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/FR9NU1900070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5642c2a01c3bc1d0b1ae7cc67f287f581af06c41afea2ff39ca6465bcdd3c3ea. 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/FR9NU1900090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4948f83fa1d9f9836b981685de0b7506646e543f939c8a8f0e4bac32915a089. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/FR9NU1900080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d34fd9c6b9756abf88662929e22da9c47efc083e09078746b2e713a3e19973a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR9NU1900100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d77f71e26cad14c8cdaa45fa1abbc07b84612991ead946e76ab0b6986390b4a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR0U91201107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b778570a8e362f3c77634d4f10c659505c6e4df4690d10a873ffee25270134. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR6P12000890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fd76a6d208080660f78d7ef62522df1118679f610fb1fb2034260cb1ab6563. 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/ES5701300492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7975765de74269c72554cf7b705fbe67433534766920f32a56b127c63529ecf0. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/FR0U91400716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e6d59d3f6bde7b69a9b19eccb494f5b4f2b0e1adc8a1341080a5e971aa8d9b. 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/QZNWZ2008035.