"Reckoner" is a song by the English rock band Radiohead, released on their seventh album, In Rainbows (2007). It was produced by Nigel Godrich and developed while Radiohead were working on another son
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 0xae29cdea5106d8698f0bc94215b48b85f91562ee62d3d9b00e32029c37e673e2. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52e8c8d5-15d6-405d-bd19-591d627ebb59.json and https://artists.proofprofile.net/proofs/artist/52e8c8d5-15d6-405d-bd19-591d627ebb59.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).