Your question is not clear enough for me to give an answer. Where are you importing your private keys from and where (which address) are you sending to?
If you are asking if you are protected from double spending, Yes you are if you wait for 1 confirmation for lower amounts and 3 confirmations for very large amounts of bitcoin.
- Jay -
https://bitcointalksearch.org/topic/btc-puzzle-6667-and-68-solo-pool-5454194assuming someone found the private key
by using kangaroo the algorithme here
https://bitcointalksearch.org/topic/pollards-kangaroo-ecdlp-solver-5244940 anyone can get the private key with the public key
public key will be known to everyone the second your transaction is shown
how to prevent looters from double spend this transaction? the amount is 6.6btc or 6.7btc or 6.8btc depend on the puzzle number 66,67,68
importing private key to electrum wallet then send to your address is it enough?
You import the private key and then send the coins to another address. Why not just sweep the private key instead. But if you just prefer to import and send the coin to another of your address, that is not also bad
as long as the private key that you imported is not compromised and your if the wallet that you sent the coin to also is not compromised.
the private key will be compromise in seconds (1s) as i mention above with kangaroo or a similar algorithme
link to ann of the puzzle
https://bitcointalksearch.org/topic/m.63933672here someone talk about double spend
https://bitcointalksearch.org/topic/m.63465321