None of the following are "cold wallets":
save wallet dat file . . .
Thats all it takes just saving your wallet.dat? . . .
only way would be transfer them to a computer wallet, then transfer your dat file . . .
. . . You can use advanced options tab in blockchain . . .
How about encrypting . . .
If you use a service like Coinbase . . .
. . . go on blockchain . . .
Use wallets like myceilum . . .
At worst, a cold wallet is a wallet that is not and never has been accessible from the internet.
At best, a cold wallet:
- Was generated with a source of randomness that is guaranteed to have at least 160 bits of entropy.
- The private keys and addresses are calculated on an operating system that itself has never been connected to the internet.
- No address that has value associated with it has ever received an output that has been spent.
to have never been connected to the Internet? But "cold storage" just means that you are using something like a paper wallet, right?