Brebu may refer to several places in Romania: Brebu, Caraș-Severin, a commune in Caraș-Severin County Brebu, Prahova, a commune in Prahova County Brebu Monastery, constructed in 1640 Brebu Nou,
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 0x0d4f820bf5a5ed7d75c16b74a289ba36091583986adbc6926e208b3f3c69dd4b. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23e5e465-08ac-465d-beee-1e89994092bd.json and https://artists.proofprofile.net/proofs/artist/23e5e465-08ac-465d-beee-1e89994092bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).