Ruja was one of the foremost Estonian rock bands of the 1970s and 1980s. The name of the band comes from a neologism "ruja", for science fiction, though there are people who believe that "ruja" is ac
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 0x9003ff7310de5b55de40e8ae19fca8488ba3d1ba187d5e4045425e1f1087495f. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/182e7724-ab81-4ebe-b4a3-e73e16f70694.json and https://artists.proofprofile.net/proofs/artist/182e7724-ab81-4ebe-b4a3-e73e16f70694.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).