Stefan Kostadinov Valdobrev (; born 20 May 1970) is a Bulgarian actor, film and theatre composer, singer-songwriter and filmmaker. He received classical training at the National Academy of Theatre and
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 0x579369e460909603cc20932d1ef9b329aa8145ca70b619e637b551f635c249ad. 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/ec5bd72f-29a3-44a5-b9d3-d6e1f0835c75.json and https://artists.proofprofile.net/proofs/artist/ec5bd72f-29a3-44a5-b9d3-d6e1f0835c75.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 0x81f481c76a9fb67f90a087f0c1ced94ca53d29eea78d91b0a8a11b453044b55e. 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/QM6P41499706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244e5203156dc3899eee8cc516d6b4a8bdb371ad2371cb231c8ec6b95f26dbcd. 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/QM6P41499708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb20c1b0b6cac9f8422ccb3c9bd37050918778acdb4f0a05322e6919f88641c. 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/QM6P41499713.
Bryag s tsvyat nai-zelen (From "The World Is Big and Salvation Lurks Around the Corner")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c748633a7ebd660841f548f3c5680bc0f6f994f053148c91a33734f12643a0d. 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/USA371677101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068cf6af6e2ddeea9857aa0f5386fc55f33c6655a3d5604d6af747f8055f17c9. 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/BGA671275772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5882e1459d204c13467e2905987bcd5a470db67b4fde45b02150971171d94e. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/BGA261305368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa181c69d1908a6765ba7562f810cc7010991ee6c665a45778c87a89a3a8090af. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/BGA671660304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78db4bc49e9353fdcf622e30a05501b028622f95ee023ddcd240b48ab4c9a4d2. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/BGA671660306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb0b9c53766c984a2be1c74bf986abe86f4e4b495655297eda887455c78346f. 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/BGA671660310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791bba2dae93455cec6c197c6d6f67c77e3356b352b62c780ce029c1007a2e0c. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/BGA671660313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66d46547bd0919bf9f1ea2115174e41b8202e2a9cacb9c980058f7b3ac7272c. 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/BGA671660302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ad8303b2fa3e37c589e2e5ad0c5f3730be512a32e5201ee663d9eabdc33733. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/BGA261581051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c37fa990b96c07ab6c86edaf2a44de3f2ecf7e041c3dbd702a347f3e1d6a52. 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/BGA261581052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98aae4ddce341acedb754d1051a5deec55301407d820b8589baec2e457880961. 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/BGA261581054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c060201e142b77152b35490e96e3e9055d365c95f99269e765869e2f4859284. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/BGA261581057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb4f9c0433483368fd194ec805ef76ace7ad3380c72da56a168d850692e8f2d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/BGA261581062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3680a4977ae3710d17dee528b37c80d8d4e294c2a97a501855b3463f2f60618. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/BGA261583826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6969eef2b59da102fb5b317f30133b1b120b3490a770aef261155a65ebe7face. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/BGA261583827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826ecb55dba12b83525b2d3425fd85c1173cd3e19ebe56ad28a68d1c820c0fba. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/BGA261583828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3222b920ba25fdabf6ac7635a40949ec800e33693c0ffec9d708eb74688dbd. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/BGA261583829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a04ef1db38d5eac365c055cf602e5dfa2d11336f6477adae77313c3b6937fe. 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/BGA261583831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a76ccfece7000f126cb9ef39bff8e616d03ed71637b4e5802db91c70568fd2. 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/BGA261583833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240fc0d6dd135b21869a6a6aee52c4e0cb714614db9b2a7f537260e53fe3c1e7. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/BGA261583835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3b0b331c4ad3738daf957501bccc37e54e27446956966c44a608dce16d91b1. 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/BGA261584955.