Minisign is used by VyOS developers as a tool to sign files and verify signatures.
Sign files
minisign -Sm vyos-LTS-1.3.4-amd64.iso
Verify signature
minisign -Vm vyos-LTS-1.3.4-amd64.iso -P RWTHO8ibvoCdIvZWhNLftqRJpN25VCVHNjh4feXXO0Gi7b6wKwlZ2MMS
Signature and comment signature verified
Trusted comment: timestamp:1697622624 file:vyos-LTS-1.3.4-amd64.iso hashed
Sign with a comment
minisign -Sm vyos-LTS-1.3.4-amd64.iso -c "build by Kenneth"
My public key
RWTHO8ibvoCdIvZWhNLftqRJpN25VCVHNjh4feXXO0Gi7b6wKwlZ2MMS