Hey everyone 
I just published a deep dive into one of the most important concepts in Midnight: witnesses.
If you’ve gone through the early lessons, you’ve probably noticed something:
Everything works… but everything is public.
Witnesses are what change that.
They allow your contracts to:
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Access private data
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Use it inside circuits
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Prove correctness
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Without ever putting that data on-chain
The article covers:
• What a witness actually is
• How it connects Compact → TypeScript
• Why witness data is treated as untrusted input
• How disclose() controls what becomes public
• How everything fits into the transaction lifecycle
If you’re planning to build anything serious on Midnight, this is a concept you need to fully understand.
Would love your thoughts or questions 