Lev Valerianovich Leshchenko (; born 1 February 1942), is a Russian singer,David MacFadyen, Red Stars: Personality and the Soviet Popular Song, 1955–1991 McGill-Queen's Press, 2001, , 319 p. who is be
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 0x842550d5ae2c0c6ee1bb943de83460e6e5f6560e61503be5e25539c8496e6e56. 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/0428889c-79f6-4f72-a9fd-2500eb238443.json and https://artists.proofprofile.net/proofs/artist/0428889c-79f6-4f72-a9fd-2500eb238443.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 0x6500826de97de115b7ff1c180713dfd2a635867039fa09fd4e5d5cc61c3588bf. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/RUB651309757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69315a63ca4c9e96f649d097d56a885fafd7d2eeb5d254761cdcea76900ae797. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/RUAAX2000339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd9ec18f94a81777c07650d7af6e40f67bc380f1da5cf73751dd43c1ae1f213. 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/RUB651309792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb765f1e37e9a644b6c8f982395ec7abad7122908ef35c19c7a299e304fedfaa2. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/RUAAX2000310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6699b894179b24194ee1f3b967dad0044196378f342a448de50d470e927a5d8d. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/RUB651309855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad60d2c9ea2f121d8f209504dcfe4ee450d44ceaf59fb68f1c914b4bfb2029c5. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/RUB651309891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13cd8dcc490629781208e28925f2c3529f19c6ada56fe9b395d163b16e4d30d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/RUB651309896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde338b4714419beb8b16cf6dbfc47e5f2fed5455b2c8b7d1d4c552c1f6331ad. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/RUB651309900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de1d825b0e6ce6b10d0196ec4db0a5ee732b29bc8da53504465b27383d24203. 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/RUB651309998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc952de2c422b756798240dce9b8f08bdb367f411d10e6c7f1a03303301efa2. 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/RUB651309999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca8d1f06c4c3841a869ab9783a7473231fa44811f60191725cc2374282bff7f. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/RUB651310003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8395df5aba1dc0ce1ab0ac0a9ec0fc97d8e01937c941187b8d8de668107b597. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QM6N21972955.
Я тебе подарю (50 лет творческой деятельности)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a314c09844f2b0c69fb09cae5e75ecfefc80ab5f814a342fdbd2822a1c7b60f. 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/QM6N21972273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8065c5e75c43882a30faaa357bf6411a47eba6f74d024ebbd6ae9f421b29e791. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QM6N21972274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2d59ee15c5b3dea1a9b8bbc64b20a1387ad6d764b15009e0b7a4b3c1f5c25b. 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/QM6N21972277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced203843d4832d799129fcfee8d256ed02332ad7bf6c6b63b5dd7f0ca686ec2. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QM6N21972287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e053e2ed1f37dbe416d6964d98a442de41645806db46e8a02fa13e56d5e508. 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/QM6N21972366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34981e8061f0d65129e04cd0e9235c2bcab0f57e14afae3f41f219a5e3a7fd03. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QM6N21972368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b23800de00e0c2164469ac04b7ac34aed8adcf1a9ffea6113e654f007e9e649. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QM6N21972374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8d0bbc1caf9bdea997d0b88e3cd97192f11338eef56d0786b7fdb2d7752a7f. 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/RUB732085207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd248785b5f972b529ed917c1977185ab04b96e14b37eab09710a6814ac15ffec. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/RUB732082456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2825d439384bf0e41b09d7242fcfd51b5fbcde31a97299665e777bbcd96ede. 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/FRX202506784.
Песни Победы. 80 летию Победы посвящается
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0149d7f2d80b0ab159b5a069ab92c4fcc6cc3548d8441c829720e38bcde9a15. 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/FRX202559528.
Артист (Юбилейный концерт в Crocus City Hall)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf833f9bec53c7f8b499a6ec35937f8cbc462696ebd87cf625da4f2e0fbc36eaa. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/RUB731577654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f12042af75705880110cdac7b5dbc4faff7388b86ffa63ec07718840a0cc4d. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/UK2Y21500939.