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Re:Show HN: I built a live Bitcoin price aggregator with mul... by ph0rque on Monday December 02, 2013 @12:50PM (#6835205)
you could lend out your bit coins to people who would agree to pay you back a slightly higher number of coins in the future.

Is this something that can be written into the Bitcoin protocol?

Re:Show HN: I built a live Bitcoin price aggregator with mul... by qrohlf on Monday December 02, 2013 @01:00PM (#6835278)
No. Bitcoins are designed to act like cash, so he would need to ask for some kind of collateral to ensure that people don't just run off with his bitcoins.