What is the difference between the Message and Tag values when creating a new transaction object via the JS library
Tag field is short and can be used to search transactions (so you can search the tangle for transactions with tag "GUS9GORMAN", but not for transactions with message "GUS9GORMAN"). The
Message field is longer; but for transactions that spend iota (which is internally represented by a negative
Value), the message needs to contain the signature so that the transaction can get confirmed (so you can only fill it with custom data for transactions that either receive iota or zero value transactions).