How We Use Ed25519 Signatures to Give Users Cryptographic Proof Before They Send

<p>When you use a cryptocurrency exchange, the flow is simple: you send coins to an address, and the service sends different coins back.</p> <p>But there's a gap. Between sending

<p>Imagine handing a notary a sealed envelope with carbon paper inside, having them stamp the outside, and walking away with their signature pressed onto a document they never

<h2> The shape of the problem </h2> <p>Most "login with X" integrations work the same way: your server gets a token, and to find out if it's real, it has to ask the provider. That