import "github.com/sashka/signedvalue"

// Sign your "Hello, world".
signed := signedvalue.Create("secret", "name", "Hello, world")

// Decode a signed string.
// Treat signed string as invalid if it's more than 1 minute old.
decoded, err := signedvalue.Decode("secret", "name", signed, 60)
if err != nil {
    // Signed string is no longer valid.
}