thumb|Toni Hill Toni Hill is a Spanish author. His first novel, El verano de los juguetes muertos (The summer of the dead toys), has had a great success and it has received many excellent reviews. To
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 0x70643ca745c506611170e3ec6a0487e433d152c43e85f636bc84e8f58cb4ffc0. 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/52cc545a-be2c-4f7f-ac4a-cdecf5f46b2d.json and https://artists.proofprofile.net/proofs/artist/52cc545a-be2c-4f7f-ac4a-cdecf5f46b2d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).