Elena Sergeyevna Katina (; born 4 October 1984), better known as Lena Katina, is a Russian singer who gained fame as one half of the pop/electronica duo t.A.T.u. She started her career at the age of 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1c0c66a9c9eb2b2399848841ea87b1b7fe1b57eff9a659f706eb0bb8977dc0. 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/b0267be3-919f-49f2-b4b8-85c2ec32931c.json and https://artists.proofprofile.net/proofs/artist/b0267be3-919f-49f2-b4b8-85c2ec32931c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d6f7d70379057398da71196ca5db79d9f403f0fa380a05e6e9ca74bc70df51. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/USQY51258745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81edefe38278edf6203ad2c844aceb859926bfb321e26f88b86acf3868e57f2f. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:25:20Z), 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/TCAAZ1181460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123700e1e6efb25d1263d197712f88ce3edf86daa3e96b0ff12332373ad9c7e1. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:33:27Z), 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/TCAAZ1181461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350f6e8c99f615182d2bf0ba8cac87cd7b781abd0ba18902bb324566d84d7e89. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:58:21Z), 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/QMD9B1400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fd857bef3db2a7bf62c11553754942c16a462b4defd6ef227420bc7de1bc42. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QMD9B1400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a3c61c2c55ab25b5363000f2e924e78a3a78d44438cf9de0f0f8bd33e70de4. 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/QMD9B1400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cccc35f4bc6daa23c97dd555e15bbc4bfa42a8b70f25cc55ad221177c274c2c. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QMD9B1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8063ab78d9485099a1d1cfcc585eb6d9963cfee4295fe2019f123202fe37c57e. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QMD9B1400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9174713be96886e8b70409daf933f9ba68ae8de58f66d9e89ab7ff076e2e9cb. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QMD9B1400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2743e267c628409ca7f98d6564442345a386b1f61302cab7d229c97a86930786. 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/QMD9B1400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3c67e143b2232a5af9862308bb6aad48cc24b202b4967e825858595938e9ce. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:21:52Z), 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/QMD9B1400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7a32a7574a7f2a9a119a8f233d63636d61829d1ede3f4b38ac864727291380. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QMD9B1400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d286fd13a28922a60f56dbdab8f82a916a33409f9f2886a83cb26a75adef2f. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:44:00Z), 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/QMD9B1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fa695c05e5562b02a94b0d9bd50b2a71537b8b09a058c620f05fb710810b5b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:32:49Z), 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/FR59R1964068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc0d30d3ee42c45fdf7f114067c8890675626f569864076b13ac5a78d7c2a11. 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/FR59R1866982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5258372f2c50f270b7babebcfe91dd1a043bf7b2ffa6b3579838aebf51316a8. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T15:05:10Z), 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/FRX201842217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1939266438550c06d053114e880417fe05b2dba6a6c2b5e75e6776ff11c8f7c0. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/FR2X41925938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b67f48432bb5ef9eb54fde6c519f8450be1eb86aa8096eef4c513c47301805. 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/FR59R1964069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279f0a3b44216bfb5d7fabd27af9b715b536246d567392d53f3f60c3bcc6795c. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:06:43Z), 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/FR59R1892046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d572d92934d1819fc610fa1e129d8abd77d8ea17f65054a094cc4582fc9d5e4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR10S1868619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa554a63d3b9f459dcf644f6b3082f9336a0fa6e70ca25b808a573b61e0805630. 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/FRX201902602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ff5ee9654ac5950a4ee0548c0fe084ffa76c8bd2300b895bd3a26c66218f49. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/FR10S2371931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602ec1875d3ff91b9e22d10547126fcd4bf33cc11e3ae8c55d486c9d55b936a1. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:54:39Z), 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/FRX282341670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ebc5bc1a8dca11921a8307f66d57251e803821513b34a230926bd6719452a3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/FRX282341671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59cce65904d30f9818e7b53adb1045c420db15abf5f17b77e5dd1716e052a681. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/FRX282341673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170e08b729e7bd813fda612cf0ccd61cf13b51cd8d6d8bd277ee92b8e2482fd3. 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/RUAGT2576121.