More Examples

Zero-confirmation transactions can be used for spending small amounts.”

“It’s usually best to wait, but zero-confirmation transactions are possible.”

“I wonder if I can send this as 0-conf.”

Definition(s) from the Web

  1. After a transaction is broadcast to the Bitcoin network, it may be included in a block that is published to the network. When that happens it is said that the transaction has been mined at a depth of 1 block. With each subsequent block that is found, the number of blocks deep is increased by one. To be secure against double spending, a transaction should not be considered as confirmed until it is a certain number of blocks deep. Note that unconfirmed transactions do not expire. Source
  2. Bitcoin transaction confirmation is needed to prevent double-spending of the same money. One of the main advantages of bitcoin is that it avoids the problem of double-spending, i.e. the risk that a digital currency token may be copied and spent more than once. In spite of having no central authority to verify that its tokens are not being duplicated, bitcoin successfully avoids double-spending through a system of decentralized transaction confirmation, based on the consensus of its users. Bitcoin transaction time is always changing and it depends on the miner’s fee. Source
  3. The proof-of-work system, alongside the chaining of blocks, makes modifications of the blockchain extremely hard, as an attacker must modify all subsequent blocks in order for the modifications of one block to be accepted. As new blocks are mined all the time, the difficulty of modifying a block increases as time passes and the number of subsequent blocks (also called confirmations of the given block) increases. Source

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