Centr () is a Russian hip hop group formed in Moscow, Russia. Originally composed of Guf, Princip aka Prince, Slim aka Slimus, Ptaha aka Zanuda. In 2008 the group was the winner of the MTV Russia Musi
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 0xa1c64c64b5a462c6a28c3383c9e5cf148d49cedad2b29839d2587005ff62abdf. 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/3c4eece5-71bd-40c0-91d2-89f97899be9a.json and https://artists.proofprofile.net/proofs/artist/3c4eece5-71bd-40c0-91d2-89f97899be9a.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 0xcfc5bb9defef7db194102bd8808fcd5111fb532385309f528d209dde974bcad2. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/RUA590700643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d05ac2e81972d06f186d74c4c27b9b7d73ecd6436dacf29883691096a2deda. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/RUA590700644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611ffda6de289fb42f81ee9f1dc04be384cb9ebc93a5a4d6bb3cebe77e0ac328. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/RUA590700645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a81c1b7b5ec99c678601f2e65b118cf2d3d1e8a534ad86d14f4d3746d1acaf. 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/RUA590700647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7688a13cca9f4e2ebc3dc85c39638670dce89a01596025d24651078404864740. 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/RUA590700650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8957a74802815f775f8546a18eb8b5b728f39f22c9f62ec7c9e1e9f14cdb3007. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/RUA590700652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f75e1a78ca68c51a5ec2723d572591daa30792e05c563b4a55f6b8c9ed649b. 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/RUA590700653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37410cbfa44cbdb416b98fb2903e5c1433be4a2fdd03a21bf22bcc2e13fb2b15. 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/RUA590700656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fcfb2a2c67a6b725b353f8eb7c57a77ea3541dbad4c6611f4548b06f33b098. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/RUA590800293.
Будни [при участии Принцип & ТАНДЕМ Foundation & Стриж & 5Плюх]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e45c670e15456059792dfa22159cae3e61c22755dac8d5eea4b50e3d25d8c3. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/RUA590800295.
В норме [при участии Валик Словетский Константа]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f2a0b37ceec49977af8e001eece55d9de95bc20c9007ff8eeee265ba8880d4. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/RUA590800296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa495fbc190f350705b72a87ea78b2e9e4651e790ac02f70c9647146981cc16. 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/RUA590800301.
На запад [при участии Валик Словетский Константа]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5154b0e7b83f4a05cfdf37aba36c1fc26a9ec3d1cf169edb941c2c1e38ecd12f. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/RUA590800302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa1e3a8eda36f96f90e97854c9faa1f092a86835f7c64463454dabf5cdcc71b. 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/RUA590800305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f65c1ba20be6f42a24be1e1e87d9a8b6dd9e27632eef67f69e28063e1b75082. 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/RUA590800307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda01327e3ca3f367b1888f2622a185536e55d8f63c75f0963ad4e0498af274b8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/RUA582107383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa90cb9175dcae89e76f04f367e1323e9bbe05f9c6aca58199b5a17ac7d2fa5. 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/RUA582107387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2a7640d12688bcf815bf98389824f886270aedd75eab40b8eab4f0a9dd85d6. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/RUA582107392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038170c427f72526625c6b3001869ccf583b7f055850003bbf47058031c9a57c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/RUA582107407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d5282fe3d525244eee38acfd93e860e2224008dfd82d44dedce75a58d94cef. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/RUA582107408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8834fa959f262f83a6543c51e6ea063378012436972a441eb9529b86b445623d. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/FR10S1654448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cebf1162dbc27a63b01154ac2212ec5c035100f75979319be8b0d5c6f531add. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/RUAGV2405568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6339c3f46ba802b3e032921c726e20d4bc1ef8fde56589d53c1b4329dfe50475. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRX282249993.