Read more about it here:
https://github.com/LIT-Protocol/lit-ecdsa-wasm-combine
yarn add @lit-protocol/ecdsa-sdk
<script src="https://cdn.jsdelivr.net/npm/@lit-protocol/ecdsa-sdk-vanilla/ecdsa-sdk.js"></script>
<script>
console.log(LitJsSdk_ecdsaSdk);
</script>