Katarina Pejak is a Serbian blues singer, songwriter, and pianist. She blends a basic blues styling with elements of soul, folk and jazz. Pejak has been involved in the recording of seven albums since
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 0xde3d7af451da907fc0ce643cc33ea85ee63c5a349b67ef14bd48d86de619ce13. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3ea1895-e4be-45cb-93e4-90c4950f28b2.json and https://artists.proofprofile.net/proofs/artist/e3ea1895-e4be-45cb-93e4-90c4950f28b2.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 0x2d6e9f7978209cd9b7fb424b943a9089c8f2c55155f4da78200aee9b0182f411. 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/DEFR12400076.
Come on in My Kitchen - Blues Caravan 2024 Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486dd3120c3d28c85600e97fee7d0b1e0a0ec57da5e8d6b40ea61ef39db153d8. 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/DEFR12400136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d670cb0df26818d155fde362074ce65164742623315a64b7ee05e9c50a675de. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/DEFR12400137.
Notes on Boredom - Blues Caravan 2024 Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c46d7d592fc9cc2068c284e059e72a16b8e0aaba05880a02321b50f4b5a65c1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEFR12400138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f8292694652a3952452d6df3f656a5c15868b8ee523a3bc7ac82f73729f6e7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEFR12400139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79799774df34cc85e7ff7129059c3e5171ef9f610f73ace12d68b838a56132a5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEFR12400140.
I Walk on Guilded Splinters - Blues Caravan 2024 Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf245336f7ee24f66f67af435b7a9a3e09900fa916aef099db16853e961cfbc91. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEFR12400149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c75c6beb18b90605249c3e94992572276d0fffa9ca065c55e6f908b06682c95. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DEFR12400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63aaed932c2e4aeef60d6d461207c7ea27775746d578f2f8ce08d5159da454dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEFR12400151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fd02735992cd06593a2ea32488dcd6416ec766f9da58212eed2d603bc67f05. 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/DEFR12400096.