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Here are 20 ideas for decentralized crypto applications to jumpstart web3 for 2023.

1. A decentralized prediction market platform, where users can buy and sell shares in the outcome of events, and make bets on the likelihood of certain outcomes occurring.
2. A decentralized ride-sharing service, where drivers and riders can connect and transact directly, without the need for a central company to facilitate the process.
3. A decentralized peer-to-peer lending platform, where borrowers and lenders can connect and make loans directly, without the need for a bank to act as a middleman.
4. A decentralized insurance platform, where users can buy and sell insurance policies directly, without requiring an insurance company to act as a middleman.
5. A decentralized marketplace for buying and selling goods and services, where users can transact directly without the need for a central company to facilitate the process.
6. A decentralized voting platform, where users can cast their votes securely and transparently, without the need for a central authority to tally the votes.
7. A decentralized content-sharing platform, where users can upload and share content directly, without the need for a central company to host the content.
8. A decentralized social media platform, where users can connect and share content directly, without the need for a central company to facilitate the process.
9. A decentralized autonomous organization (DAO), is where users can come together to make decisions and take actions based on a set of predetermined rules, without the need for a central authority to oversee the process.
10. A decentralized network for storing and sharing data securely and transparently, without the need for a major company to host the data.

11. A decentralized virtual reality platform, where users can buy and sell virtual experiences and assets directly, without the need for a central company to facilitate the process.
12. A decentralized platform for buying and selling renewable energy, where users can trade power directly, without the need for a central utility company to act as a middleman.
13. A decentralized platform for buying and selling carbon credits, where users can trade credits for reducing their carbon footprint, without the need for a central company to act as a middleman.
14. A decentralized platform for buying and selling event tickets, where users can buy and sell tickets directly, without the need for a central company to act as a middleman.
15. A decentralized platform for buying and selling domain names, where users can register and trade domain names directly, without the need for a central company to act as a middleman.
16. A decentralized platform for buying and selling real estate, where users can buy and sell properties directly, without the need for a real estate agent to act as a middleman.
17. A decentralized platform for managing and sharing intellectual property, where users can register and trade copyrights, trademarks, and patents directly, without the need for a central company to act as a middleman.
18. A decentralized platform for buying and selling advertising space, where users can buy and sell advertising directly, without the need for a central company to act as a middleman.
19. A decentralized platform for buying and selling collectibles, where users can buy and sell rare and unique items directly, without the need for a central company to act as a middleman.
20. A decentralized platform for buying and selling online courses, where users can buy and sell educational content directly, without the need for a central company to act as a middleman.