If Bitcoins are used as a store of value or investment vehicle, what legal documents should the investor require/keep? To date, no jurisdiction has special laws concerning cryptocurrencies, but investors may want to implemented best-practices to avoid later hassle.
Personally, I'd expect a receipt for any fiat-BTC transaction indicating
- full name and address of the other party or exchange,
- amount in BTC and fiat currency, and
- any fees and taxes incurred.
Is this reasonable? Do larger exchanges, Mt.Gox or Bitcoin-central, issue a printable document with this information?