What does this string mean?
ex - 4952fff4bfec7ff92ac25218d467edfb4e1915e80c6ab962276a5395c1a2f8b6
How can I properly decode this into a txid or something I can use.
When an update occurs, the result is a hash of the
entire tx history.
To determine
what changed, you need to do a get_history.
The idea is that wallet software can cache the result from watch_address, and only issue a get_history when the hash changes.