Here's more ideas:

4. Medical Records Access
Patient grants access to doctors via signed JSON. Each visit logged immutably. Second opinions can verify history instantly. Solves: Fragmented healthcare records, patient control over their data.

5. Decentralized Voting
Elections stored on-chain with cryptographic proofs. Vote once, verify anywhere. Solves: Election fraud, lack of transparency, centralized counting errors.

6. Insurance Claims History
Claims verified by adjusters, stored as JSON. Future insurers check real history. Solves: Fraud, "forgotten" prior claims, faster approvals.

7. Real Estate Chain of Title
Every sale, lien, and transfer logged. Title search becomes instant. Solves: Title disputes, fraud, weeks of paperwork.

8. Legal Evidence Chain
Lawyers log evidence hashes with timestamps. Court verifies nothing tampered. Solves: Evidence tampering claims, chain of custody gaps.

9. Music/IP Rights Registry
Artists register work, grant licenses via JSON. Streaming services verify rights instantly. Solves: Rights disputes, unpaid royalties, ambiguous ownership.

10. Charitable Giving Transparency
Donations logged, grantee spending verified on-chain. Donors see exact impact. Solves: Trust gaps, charity fraud, unclear impact.

11. Freelance Reputation System
Clients leave verified reviews. Portfolio history immutable. Solves: Fake portfolios, reference checking, gig worker trust.

12. Product Authenticity
Manufacturer logs serial numbers, ownership transfers. Counterfeits easily spotted. Solves: Luxury goods fraud, recalled product tracking.

13. Event Tickets with Resale Control
Tickets issued as NFTs. Original price embedded. Resale can cap or require creator approval. Solves: Scalping, fake tickets, price gouging.

14. Subscription/Membership Proof
Memberships logged, auto-expiry enforced. Gyms, SaaS, clubs verify instantly. Solves: Fake memberships, manual verification delays.

15. Warranty Tracking
Product serial + purchase date logged. Warranty claims verified on-chain. Solves: Fake receipts, expired claims disputes, warranty fraud.

16. Recipe/Trade Secret Protection
Chef logs signature dish hash. If competitor copies exactly, proof exists. Solves: IP theft, recipe disputes.

17. Bug Bounty History
Researcher CVEs logged with severity, bounty paid. Employers verify security talent. Solves: Fake security researchers, credential gaps.

18. DeFi Underwriting History
On-chain track record of successful liquidations, yields. Protocols can assess risk. Solves: Unknown counterparties, blind trust in DeFi.

19. Decentralized DNS
Human-readable names map to Hive addresses. Not dependent on centralized registrars. Solves: Censorship, domain seizure, single points of failure.

20. Academic Peer Review
Reviewer reports hashed and logged. Publication integrity verifiable. Solves: Fake peer review, publication fraud.

The common thread: Hive acts as a universal verification layer where trust would otherwise require expensive intermediaries. What angle interests you most?