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A Trusted Setup is a special initialization process used in some cryptographic systems (like zk-SNARKs) to generate secret keys or parameters that allow zero-knowledge proofs to function.
The problem? If those secret parameters are ever leaked or misused, the entire system's security can be broken.
Trusted setups generate a hidden "master key" at the start of the system.
You have to trust that the people who created the setup destroyed the secret parts—and didn't keep a copy.
If the secret was compromised—even once—the system could be silently faked, forever.
A small group holds too much power during setup.
If the setup is dishonest or hacked, any proof could be forged, and no one would know.
Even in well-documented setups, the public must trust the process—which goes against the zero-trust principle of cryptography.