# Proof of Acceptance for Merchants

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*The payee needs proof that at the time of each transaction, the majority of nodes agreed it was the first received.*

\- Satoshi Nakamoto, Bitcoin Whitepaper

For merchants to confidently accept Bitcoin payments, there must be a reliable means of verifying that the funds received are valid and not subject to double spending. This can be achieved through various methods:

* **Node Queries**: Merchants can query multiple nodes to confirm the status of a transaction output.
* **Transaction Relay**: Merchants can send transactions on behalf of the sender and receive notifications of their validity.
* **Double-Spend Alerts**: Systems that notify parties of double spend attempts can help merchants avoid potential losses.

These mechanisms are essential for enabling merchants to accept Bitcoin payments without the need to wait for transactions to be confirmed in a block, thereby streamlining the payment process.


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