Mantas Jankavičius (born 20 May 1980) is a Lithuanian singer and actor. Biography Born in Vilnius, he later moved with his parents to Kėdainiai. With 13 years, he started singing Kėdainiai rock band
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 0xe81b412545ed5244c757b2faf8965e6aad6498571284321861bd20860ed88c35. 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/e2ff07ec-56ae-4082-9aaa-13985f8e1b63.json and https://artists.proofprofile.net/proofs/artist/e2ff07ec-56ae-4082-9aaa-13985f8e1b63.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 0x2d82f1b7a997eef547bf58ab6c6e612bbc2c8ba3e416e735edd36013efd86f0b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/LTF281900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53342d2b365ae66f6dd72bbe9dcd72a3a20c0b8fec2f45c8107b1c8cd905a321. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/LTF282000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d462b4d7098cc9a5c56a06b113892aa72e4fffabd0cd0e63ea8d50a4a8c043. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/LTF281900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc566dfa6195c27215781e8b532fe13a7aa97b6feeba1aaa520fc576034212c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/LTF282200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cd0879ac9ba51f8d64d01cbc6a2f90efe55e56d9797498ede2b4486c366e5e. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/LTF282400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13351386784f48dc9ec66b5adf89d2d369d7978e7000b704527b89b2b498211. 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/LTF282500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83af9bdfceec45d46750e94399650451b154b220f1547c2b8b602cd801d21099. 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/LTF282500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f58623d83a6632486b9c8b7c815380761287f6dce9cd41a49d1a535797848dd. 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/LTF942000001.
Žygimanto Augusto Ir Barboros Radvilaitės Legenda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fb721cd318c9e7d08e4bd3b6a6a345e74e49e0f230930c0cf9586baee1f014. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/LTA701600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033f60291a97ef5cc186a6bd2bc305242be618f9edf608dbc65ea5f61cc62446. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/LTA701600037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738ec9e10f0c2baeecc5d86d3e5f33247b362bf77effaf3879061115af632562. 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/LTA701600040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6cf8240e555c5f1091de40c940577779cbda2160db2a3b64d99fd5dcaad631. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/LTA701600043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a36830b0eba8305413b86d82c4367bf285bbafed48c6777fba0d99106d51f5b. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/LTA701600050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c2e293d7e70cdfc45cfdeb987ae3a9cae45f256c73899d22155f44ac920d9a. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/LTA701600060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad50f025b49d9324508b5d8446bb3b22356c3bd3d67e6fa7a9300611921c3fa. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/LTA701800034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb309c69e7ab350fc4378614b38ab975aea1edd89dfb921d1ca46ac551c47453. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/LTA701800037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb666610c594101e6a6f962d298d3c3c6150b3e6ca813417e9944632d4b32bf. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/LTA701800038.