Walden (; first published as Walden; or, Life in the Woods) is an 1854 book by American transcendentalist writer Henry David Thoreau. The text is a reflection upon the author's simple living in natura
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 0xcdd31bdc8dc3f0ed7211deb4e2f4167ebb6710eeb21833035df33500bdc42237. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37805dc1-2ac2-4ac8-9262-6361be467538.json and https://artists.proofprofile.net/proofs/artist/37805dc1-2ac2-4ac8-9262-6361be467538.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).