Jack Topping (born c. 2002) is an English chorister who came to public attention during 2013 for his solo vocal performances."Choirboy Jack Topping in race for Christmas number one", The Daily Telegra
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec16bacf96ab00ab675b9acdd3e757cf8fb19aee1361980c4a1a26518016fdd. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/658f4602-8ab3-44f9-a45e-804385ded40e.json and https://artists.proofprofile.net/proofs/artist/658f4602-8ab3-44f9-a45e-804385ded40e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).