Big Bird is a Muppet character designed by Jim Henson and built by Kermit Love for the children's television show Sesame Street. An anthropomorphic bright yellow bird, he can roller skate, ice skate,
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 0x184f1bc981d5e2425541d63ff34a18834a73afe50d66582715ed5468dec71a44. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/934cbf54-ff90-413c-8ea7-cc6c34eaf61b.json and https://artists.proofprofile.net/proofs/artist/934cbf54-ff90-413c-8ea7-cc6c34eaf61b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).