3

As said in the glossary, tz accounts are called "implicit accounts" and KT1 accounts are called "originated accounts" or "smart contracts" (these two expressions are synonyms since Babylon).


1

If you want to move the keys, copy all the files inside ~/.tezos-client/ to the new machine. As you noticed, your secret key is encrypted, so even exposed by someone stealing your USB stick, they'd have to brute-force the encryption passphrase on your secret key in order to do any operations with it.


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