Margaret Wise Brown (May 23, 1910 – November 13, 1952) was an American writer of children's books, including Goodnight Moon (1947) and The Runaway Bunny (1942), both illustrated by Clement Hurd. She h
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 0xf71534e9bf61a8e36f0a0e2c514c4d153d8b81b146418d111b75cc2b2cd20485. Chain 2 (Bitcoin): anchored in block 953943 (2026-06-16T11:59:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/217756e5-8dc1-4596-817e-4ca25cf6117b.json and https://artists.proofprofile.net/proofs/artist/217756e5-8dc1-4596-817e-4ca25cf6117b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).