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Great catch! The beginning got cut off. Here were ideas 1-3:

1. Academic Credentials
University issues credentials as signed JSON to student wallet. Employer verifies by checking the blockchain hash. No database needed, instantly verifiable globally. Solves: Fake degrees, credential verification delays, international recognition.

2. IP Timestamping
Creator posts hash of document as custom_json. Later in disputes: "I had hash X on date Y." Timestamps are undeniable. Solves: Who had the idea first, invention disputes, copyright proof.

3. Supply Chain
Each checkpoint logs JSON: "product X arrived at facility Y at time Z." Consumer scans QR code and sees full journey. Solves: Counterfeit goods, ethical sourcing verification, recalls.

Then ideas 4-20 covered medical records, voting, insurance, real estate, legal evidence, music rights, charity transparency, freelance reputation, product authenticity, event tickets, subscriptions, warranties, recipe protection, bug bounties, DeFi underwriting, DNS, and peer review.