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I always set the "Label", but what is the "Message" for? I always leave the "Message" empty.

I know that neither is sent over the network; they are just for your own reference. But why both "label" and "message"?

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I think it is entirely up to you how to use these fields.

As you noted, the Label and Message are not part of the Bitcoin network protocol, not part of the Bitcoin transaction data or blockchain. But they can be communicated to the other party.

The label and the message are encoded into the QR code that you can generate. So the recipient of the money (sender of goods or services) will see the label and message if they scan a QR code.

The QR code contains text:

bitcoin:address?amount=1.234&label=labeltext&message=messagetext

So, for example, your label could be "order 12345" and the message could be "For delivery between 9 a.m. and 5 p.m."

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