Lucas Barros da Cunha (born 21 August 1999), commonly known as Lucas Barros, is a Brazilian footballer who plays as a left-back for Serbian SuperLiga club Vojvodina.https://www.zurnal.rs/sr/clanak/188
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 0x89da6d88140893f8d2c3297fbe904491611e5d750cecd87f027002701c292300. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51289c85-3329-4e1b-8104-30d44a647846.json and https://artists.proofprofile.net/proofs/artist/51289c85-3329-4e1b-8104-30d44a647846.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 0x48bd3f49e02e8e02f1548aced825931676cebcf27a7024d5bdf1797c7d47025f. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-17T02:34:00Z), 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/ARJAH2300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8794dfc0345cbc88c0a2d81997aaa480c672ca568f30f76e48ce8a77bce1394. 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/ARJAH2300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ef095c6d464d7c67e81abee287a5988a3e264e997c1af4c3c63301bb2053d4. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/ARJAH2500010.
Hace Falta (Música Original De Valentina, Mi Amor Especial)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11dc600b7d6a7310090da8d9f960858033905706f2f09d8deb716d165d83324. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/ARJAH2500023.