In the transaction trytes there are these fields:
- timestamp (9 trytes);
- attachment timestamp (9 trytes);
- attachment timestamp lower bound (9 trytes);
- attachment timestamp upper bound (9 trytes);
The timestamp represents the moment of creation of the transaction (when the user inserts address, value, obsolete tag and indexes).
To get the nonce and the transaction hash, tag, attachment timestamp (and its bounds) are not hashed with the rest of the transaction: is this correct?
This means that the attachment timestamp is not "encoded" in the transaction hash. Is this correct? Also, are lower/upper bounds still unused?