Contains is a helper function to check if a string exists in a slice of strings.

HumanizeDuration converts a time.Duration into something readable.

ParseRFC3339Timestamp converts a timestamp in RFC3339 format to a UNIX timestamp in seconds.

ParseSatoshi converts a float64 bitcoin value to satoshis.

ParseUnixTimestamp converts a UNIX timestamp in seconds, and returns a string representing of the timestamp in RFC3339 format.