Sir John Spring may refer to: John Spring (MP for Northampton), in 1399 MP for Northampton Sir John Spring of Lavenham (died 1547), English merchant and politician Sir John Spring, 5th Baronet (1674–
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 0x6b636febc5b766473d1042c23f7e394d5c4c2f871573c6dad04b348f2498ea63. 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/5b3c908c-983c-4b92-8c2a-d55c9b06fa69.json and https://artists.proofprofile.net/proofs/artist/5b3c908c-983c-4b92-8c2a-d55c9b06fa69.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).