When announcing a transaction, how does the Bitcoin client make sure network peers accepted it? For example, if I put in no transaction-fee but all peers I’m connected to require a fee and therefore reject my transaction, how will I notice it?

  • i can't say for sure, but it might be a case of waiting to see if the transaction comes through in a block Dec 23, 2013 at 20:14

1 Answer 1


The client doesn't ensure peers accept it. If none of your peers relay the transaction, then it will likely never get into a block and will remain unconfirmed forever. Your client will continue to make attempts to relay the transaction periodically, and you may eventually connect to a client that will relay transactions that have no fee or your coins may eventually get old enough that the standard client will relay them with no fee.

  • So, the client actively searches incoming blocks for previously announced transactions?
    – Lenar Hoyt
    Dec 23, 2013 at 21:04
  • 1
    Yes, it does. That's how it knows how many confirmations they have -- if any. Dec 23, 2013 at 21:51

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