signer

<script src="https://unpkg.com/msgpackr@1.2.5/dist/index.js"></script>
<script src="https://unpkg.com/tweetnacl@1.0.3/nacl.min.js"></script>
<script src="https://bundle.run/buffer@6.0.3"></script>

// SIGNER

window.packr = new msgpackr.Packr({ structuredClone: true });
const C = {
 CONTRACT: 'c',
 ACTION: 'a',
 INPUT: 'i',
 TRANSACTION: 't',
 KEYS: 'k',
 SIGNATURE: 's',
 PUBLICKEY: 'k'
};
window.sign = (from) => {
 const tx = {};
 tx[C.ACTION] = from.action;
 tx[C.INPUT] = from.input;
 const keyUint8Array = new Uint8Array(Buffer.from(from.keyPair.secretKey, "hex"));
 const packed = packr.pack(tx);
 const out = {};
 out[C.TRANSACTION] = new Uint8Array(packed);
 out[C.SIGNATURE] = nacl.sign.detached(out[C.TRANSACTION], keyUint8Array);
 out[C.PUBLICKEY] = new Uint8Array(Buffer.from(from.keyPair.publicKey, "hex"));
 return packr.pack(out);
};
        
        
        
//VALIDATOR
global.crypto = require("hypercore-crypto");
const Packr = require("msgpackr").Packr;
      
const verify = (message) => {
 const input = packr.unpack(message);
 const verified = crypto.verify(
   input['transaction'[0]],
   input['signature'[0]],
   input['key'[0]]
 );

 if (!verified) throw new Error("could not verify transaction");
 input['transaction'[0]] = packr.unpack(input['transaction'[0]]);
 return input;
};