The AT Protocol's official documentation has removed references to "NIST K-256". This was previously part of the specification for cryptographic operations. The removal of this specific standard could indicate a shift in the protocol's cryptographic strategy, potentially moving towards a more flexible or alternative set of algorithms. The exact reasons for this change have not been publicly stated, but it is a significant development for developers and services building on the AT Protocol. It will be important to monitor the official channels for further clarification on the new cryptographic standards and best practices.