BLA BLA is an interactive animated film for computer created by with Montreal studio AATOAA, and produced by the National Film Board of Canada. The online work has been described as exploring "the p
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 0x516b180efda634c95212a07bd7352aa68dd1927843e3f110dee6c3742e6fb87e. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e500c49-8787-4d45-8daf-b5ea3daa8f63.json and https://artists.proofprofile.net/proofs/artist/4e500c49-8787-4d45-8daf-b5ea3daa8f63.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).