I'm new in the bitcoin field and I need to understand about transactions. When Bob is sending bitcoins to Alice, Bob will create a tx, he will add Alice's address, sign it and broadcast it in the network. But what is the previous transaction in this case? Is it a different tx from the one between Bob and Alice?

1 Answer 1


It's the transaction (or transactions) that bob got his bitcoins from.

  • What if that previous transaction is old? Does this matter?
    – anapaso
    Apr 1, 2013 at 20:51
  • @user2016355 If the previous transaction is old, then the bitcoin network will give the new transaction special treatment.
    – Nick ODell
    Apr 1, 2013 at 21:12
  • Thanks Nick. Is it possible to explain more? is there any link that I can read on the internet for that special treatment?
    – anapaso
    Apr 1, 2013 at 21:19
  • @user2016355 en.bitcoin.it/wiki/Transaction_fees Look for "Technical info"
    – Nick ODell
    Apr 1, 2013 at 22:42

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