Suppose I have lot of bitcoins on offline generated address and private key stored on paper wallet.
Now I want to spend/sell these bitcoins. What are secure and effective ways to do this?
I will need to load the bitcoins at this offline address into some wallet (say Electrum). So do I need to load all the bitcoins, or only some? How do I do it?
So I have to EITHER sign an offline transaction made by Electrum (to send some btc to a exchange) http://docs.electrum.org/en/latest/coldstorage.html or SWEEP them to Electrum on online computer (all btc) http://docs.electrum.org/en/latest/faq.html#can-i-sweep-private-keys-from-other-bitcoin-clients
Am I right?
What the ways to spend such large number of bitcoins on offline address and private key?