Solferino (Upper Mantovano: ) is a small town and municipality in the province of Mantua, Lombardy, northern Italy, approximately south of Lake Garda. It is best known as being close to the site of
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 0xfe1fae2772366ad43ccb290b79829164e595c2e2fd77024fb857ee5c1c42ffb2. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63e32e98-5ec8-4172-91f0-979222eb7f5e.json and https://artists.proofprofile.net/proofs/artist/63e32e98-5ec8-4172-91f0-979222eb7f5e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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