Casper is an authorized network token that is used to pay transaction fees and node compensation, works on Proof-of-Stake.

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List of things that are upgradable on Casper:

📑 Smart contracts
🖇️ Protocol enhancements
🌏 Developer Ecosystem
🤩 Our excitement levels! 

Learn more about the latest exciting upgrade on Casper!
https://t.co/VNri4lVCH8

List of things that are upgradable on Casper:. Smart contracts. Protocol enhancements. Developer Ecosystem.