What is a federated multi-guardian mint?

A federated multi-guardian mint is managed by four or more guardians, each responsible for their own fedimint server. This model is the ideal setup in terms of security and anti-fragility as no single guardian can lose or mishandle the money held in the mint.

In this setup, the loss or temporary inability to access one or more guardian servers does not prevent Fedians from using the mint. The distribution of trust and control across multiple guardians ensures a robust, secure, and resilient system.

Note that the number of servers that need to continue running to ensure the operation of the mint is based on Byzantine Fault Tolerance, which establishes a consensus threshold depending on the total number of guardians involved in running the mint.

You can read more about this fault model on your own, but for example, a 4-guardian federation can tolerate 1 guardian acting maliciously or failing to run their server while a 7-guardian federation is resilient to 2 servers failing, a 10-guardian federation can tolerate 3 failures, and so on.