Boyanka Kostova (, born 10 May 1993) is a Bulgarian-born naturalized Azerbaijani weightlifter. She competed at the 2012 Summer Olympics in the women's 58 kg, finishing in fifth place. Career In June
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 0x49e340d6eb989db59dd4732e36e2e4750edfc69a3c0196f3b7533b5032446c6d. 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/a0e0bfaa-d681-44c1-840a-3537eb503427.json and https://artists.proofprofile.net/proofs/artist/a0e0bfaa-d681-44c1-840a-3537eb503427.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 0xf3094c25b55d69740ccb5f86e067ed6d1b3a9ca5c95514e37ca540604b67211c. 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/ES71G1842111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0126d2fae3c80fa57b9ef38ad57c868607e3e5ebe8c30511ebfcceddde2af628. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ES7001938001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c16be6430d7459cdacb38ef37634fee00da5f7ebcfd9dedab9c7c25a7b8c7e0. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/ES7001939601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51538ccf6cc7ac3794c45dd8310cef8b79ed7fe2d0a1c3b90062fc24541a693. 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/ES7001938004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a82f5c51c1281d7a2a7cc405e35f96053b6bef61d4534ce5ce8852514a08b81. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ES7002042703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa422dcfe5344ce0d5c9f1ded28cbe68598710cbb5018bac8ae2f5a0b3f5e581d. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/ES7002042706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169cecb5226fa9fe7a0880274f4726365e0d251145bca47d59aa0efa167b74f4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T06:59:50Z), 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/ES7002152902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efcbca5a57f73a18efb4c7d9d60ae3fb3ed8f985714b2789322f5f29cd8b576. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T13:00:55Z), 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/ES7002152905.
Os meus peidos cheiran a pétalos perfumados
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5fa3585acd3076c0fd32845b9747c2ed7c8025ff1031aa1db7b6a4ed614462. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:49:44Z), 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/ES29B2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fce881ad32732b5efb26e106fb26d572fc314c3b0611e67c888cbdbaecdd7c. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T20:20:23Z), 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/ES29B2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db74b30d86b7524b88b68478a2cc0f8d31185b82af23d2314f4562eaad171c5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ES29B2300057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf880a06354ca3817e5d5f259acbfc2c6f143cd48700867106efda83802f4a6fb. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:23:27Z), 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/ES29B2300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e9a99fe19205743ecf9253477e0d1344a711c0a4c34bb7e26fba2065b4376c. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ES29B2300061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02094afdc9cfcb91c097f9b9a3a8856ba440ea7033b5bd0292952ba5dec05bd6. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/ES29B2300062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547d33751ce03b5600b9680e4934bb2fc61912c5341345e1fbb84f68ab363d64. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/ES29B2300066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533aced2b06c6c72d12119ebb558cb5330c88581cb96edf1b12f3a6c8201bdeb. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES29B2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3581a7e822ed352af40c22a19b6292f3cfdece9c198a6338989209471d9584. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES7002150306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b4c5471d956759a586892ec9d5c5b5a97f19d0ac207be23ee0259638c8af63. 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/QZWFE2386757.
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