# Gavin Andresen
# 2010-07-18 19:16:03
# https://bitcointalk.org/index.php?topic=457.msg4042#msg4042

@s{quotedtext}
@s{quotedtext}
A few things make those 31.42BTC transactions unique: @p{par}

+ The timestamps in them will be different. @p{brk}
+ The input transactions will be different (you can think of those as being different 'coins' going in to make the payment). @p{brk}
+ And if the input transactions don't add up to exactly 31.42 (and they probably won't), they'll have different output transactions for returning any change to Alice. @p{par}

By the way: all that stuff is hashed together to give each transaction a unique 256-bit transaction ID (which you never see, but is used internally so Bitcoin can quickly figure out if it has already seen this transaction before).