You can sign messages with blockchain.info. Addresses -> Actions -> Sign message
I need to be signed on though eh..?
Of course, you need that to gain access to an address. :p
You can sign messages with blockchain.info. Addresses -> Actions -> Sign message
I need to be signed on though eh..?
Just create a throwaway account
Eh, if in case he needs the address again, he needs to remember the mnemonics or write it down somewhere, just in case..