Anastasia Oleksandrivna Kochetova (; born 13 April 1989), known by her stage name MamaRika and previously Erika, is a Ukrainian singer and actress. Early life Kochetova was born on 13 April 1989 in
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 0xd6485ae53116d874004fa473b1f3fe4d8250b56286e7023544388d604783c6da. 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/e6b63c67-5ed6-4d12-8205-9f78ec3abdb6.json and https://artists.proofprofile.net/proofs/artist/e6b63c67-5ed6-4d12-8205-9f78ec3abdb6.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 0xad66b2d6bdd27072dac91ed9fa749f60d5344c6bbcb2702a6078c2235cf8cce3. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/UABM11600817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0c65b10a2329bc8ca7bb23051f31fb7d93f35a71159fa25dc561339cd22686. 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/UABM11600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a0213b3b35c0b2e4a876d708711999559ac1d41d293b3052001e9309c44d09. 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/UABM11801491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb87dcf906d74e8ec7146db275c74926a88a884eb889f40ae3be14c552b3c16. 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/UABM11900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf4ebb434edf89316b399a1d063136df802f9a414f8c63d75543453ec30d54b. 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/UABM11900420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51d1563d1a4d350810cd8b4183b83b1ceb12b658f69a9feda1736006bb52d05. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/FR10S2093752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a182bec146010c43d233b9eefb12b240814cce69357561074bd15c6810ddb82. 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/FRX872018154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3de65676564a76a5ff4cb82163016ed71be266305a7a1f8fdd37c81dbb9110. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FRS182088208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac7fbb1ef58d80f9fe411728b97796349e9f369650dc234ca51570e6ab1998a. 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/FRX282183671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcd6ace8a276593f03270942b3374ff7df2aea33720ed6eb44673859a9d4666. 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/UADZ31990001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e98a4c224459b56e07709da895fdcdc3c3ea343bf464a2b49888b04d4dd2eff. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FR10S2249388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0042f39bcc4af43be6ed7583d4b986d39bc2150fd1dbd30bcc2fdd0f8464d4. 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/RUA3R2107116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35bdf2ac7b64f6ef3cbc9e1ecacbd5114eb07969cd934ebbc2995d80ae6cdc88. 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/FR59R2298652.