For more, run nsc help add signing-key or see NATS docs on signing keys .
nsc add signing-key --account MY_ACCT --role builder nsc builder keys.txt
After placing nsc builder keys.txt in the correct location, test it with a known-good NSP or XCI file. For more, run nsc help add signing-key or
The nsc builder keys.txt file is a plain text file that contains a collection of cryptographic keys used to decrypt, verify, and repack Nintendo Switch game files. These keys are extracted from a legitimate Nintendo Switch console and its firmware. nsc builder keys.txt