Preslava Koleva Ivanova (); born Petya Koleva Ivanova, (), on 26 June 1984, better known mononymously as Preslava, is a Bulgarian singer. She is considered one of the key names in Bulgarian modern mus
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 0x973771fa4a621ddf1b70ca2ec6c33432a237e710e7d53fa28441e9b344889b90. 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/f23c7535-6008-405e-9db0-3d2a6d4d72e9.json and https://artists.proofprofile.net/proofs/artist/f23c7535-6008-405e-9db0-3d2a6d4d72e9.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 0x1827bdf26142c237f7a001c59758aa427f46c6756ffb160f6e524f9a04d4a2eb. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/BGZ411802060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f8a8eb60bc170bb41395190916a768826d05b3fc8a0a759abadc828346b420. 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/BGA410401045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15e9c42bebd999e8c266ef4bcd850ebd9c3541dd48c12e3870918d2ece3c4ae. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/BGZ411801774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d64c54914c5abce528aea63b4aedf717ec6076908e55434dec236e246669f7e. 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/BGZ411802063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0657afa7f7f4c7978f4f861d6d9ef892621cf71808b9ab118223a0844c6244. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/BGA410401048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf551ea28ec65760db2cb49169d6c896970a4dd74ddf26550c77035f033813d04. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/BGZ411801784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50befcb0cc5be0a4c6f342d193eaf1c5051ecc98c1d3308fe508e4772f2df541. 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/BGA410501030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4452d8317355c4c11b79b200312c2a5f03ea6f4d77302f0ecd85bdebc5feb87e. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/BGA410501031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839ff9a7770865e2a58dff80d1e60a44509f330eb8d642c2b4bc8a26139d59ee. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/BGA410501032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24680439ffa13c2865ae49a30d119ce608d45a2fa8d9fdbd6c070c6ba08d472. 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/BGA410501033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd91abc60fcdb47df703fded52af80d578eb1e613a2a0a76bffe7077c67e72b. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/BGZ411801790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6652a6e44c0dc8e922fd57492bfe71510fc50448cb82045df40e382f40c7fe22. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/BGZ411801768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d29f442c90e46638fcdceb1da147afaf588e40dc078550400e8a5fa6d16d01d. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/BGZ411801779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6caeee73029a3f9318159cd8743b2bed70c6706dbd6d618ae30d01906d0d3f8. 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/BGA410601043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbe2193ab444128d9cd127650a6abb8b44b04cd250d508f6b62193313646d53. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/BGA410601045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec250d8fc3f228a3050ceb09cf746879402d662deee9c629e6ced622038a0adf. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/BGA410601046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe66a0652098faefdef82e7010e1180d57df6c339a44ce24182a4d7e9cda248f. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/BGA410601047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13160a7e7cf8e9dafe8077cb4d205df58d73cef0daf93f92047bae76732d61b3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/BGZ411801781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34db018b48acf12ad9aff05a4ece3cbd36ddee3070e679c1090cf87b9247543. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/BGA410601050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6938741f898f30f3a35e00861eaba98bb5bb90f98af5ca0d2bdbb7df87419d57. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/BGA410701018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3b24bfe978ec92715eba7333da7515d6faddac8511882f7fa2aada10719407. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/BGA410701019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e12e4b07bd0fdc97be960212ace6047d9e6a0394523c35fb81726d7d9c0cc85. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/BGA410701020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321017d08e944086f3ccaa0cea179b3ac48a95c1b7d823faf25e66eae16eb76d. 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/BGZ411801775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0ffcaf114c31739517b22eabc67b7fd63d99458ef052d38109f02417591e06. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/BGA410701025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84554957787cc4cca8c3f55cf1e3ddb985c9cac01216cfbb11cf4dcc574eb07. 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/BGZ411801777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f80d824207fa54612bf1e8817e5bb1475507fe4b68053a08868d21184b3534. 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/BGA410902060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f058771101c23a016a3441c0aa3054405d2b288b492b8422cb3e70f10d4e34. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/BGA410902061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ed245f24e9eef39fb5cec355787441612ca5120f4f487370321a5368b61ac6. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/BGA410902062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb878481f120ab65f6c12e4ba69b5c32c01648f1c93aa86541bce91b6a64965ce. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/BGA410902067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8b539e7b80348628504f86615c4f81710ae066278d9accb3ba650040520599. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/BGA410902069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea60b0601448436c7d7437a573637b36cf805390fcf690b85e7bb4a3dc1a3dec. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/BGZ411801789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea6dfc88d873b084805b25ca37cb9d78adad427bb5376c46b9d60ba768affef. 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/BGA410902071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9a934c6f48eafb395ac829cc21f80e9d188592b20feea0492efefff030ffbb. 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/BGA410902072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049530b564520c85f16f7ddb3bb484e4e9393a3109f70d49b1e52331d1c58fe4. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/BGA411114904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc322da95365d88382cb22c3928cdcac8f9d61f1b5f8320f86f23b87dc05fc5d3. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/BGA411114910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531f364265b8790f8b5e294337b44e84097e6fad31a1fda9278110f852d19c5b. 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/BGA411201008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7e59c3703c750fc0839a23a98330c7af9378fcc829a446e6121dac7beb86b2. 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/BGA411301054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f85faaf09451b315680efc74056e04d8da6391e498f5c1c1e936bc43fcdc8c. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/BGZ411800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ee7653344ff0ce9485987292625ebabbbc802d583e4caf8dc8768db7a03af7. 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/BGA411905022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd562abf273cdfb57a61f2402103d4f54db3ea53050a8290c4c2758aa39fd88d4. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/BGZ411801952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c697213efff72b03eea0ee0178d4c4285493fc6c101ee6a2be9b7e2d45b99f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/BGA412500018.