<blockquote>
<p>This could be mostly solved if the "undo tx" of the buyer is automatically published when the buyer clicks the send payment button (before seeing the payment details)</p>
</blockquote>
<p>Don't understand that. Can you describe more in details? Payment details are exchanged in take offer process. A timelocke tx which is not valid yet will not be relayed by Bitcoin nodes.</p>

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