Sirene ( ; /; ; ), also known as "white brine sirene" (), is a type of brined cheese originating from Bulgaria. It is made from the milk of goats, sheep, cows, buffalo or a mixture thereof., "Charact
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 0xb6629371c87d9d71ba7ba5c2c3f4fd469a1357b96518f10d83b8118ac5b2eea1. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cf1487a-bfac-4f43-984b-47d902f601ca.json and https://artists.proofprofile.net/proofs/artist/0cf1487a-bfac-4f43-984b-47d902f601ca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).