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About

This EXM contract combines two molecules: nostr-auth and exm ; however, the main focus of this example is to demonstrate via a PoC how to use the nostr-auth atom of nostr molecule to create a simple decentralized public square that uses Nostr Protocol for caller authentication, and Arweave (Bundlr) for data storage.

Contract

Prerequisites

  • EXM SDK
npm i -g @execution-machine/sdk

Iteracting with the contract

First Step: Nostr event creation

The First step is to generate a Nostr event and sign it with our private key, the event content should be our example contract verification_message. Then we will encoded the event in base64 format before passing it to the contract.

// for ES6 env
import * as nostr_ from "nostr-tools";
const nostr = nostr_.default;

let event = {
  kind: 1,
  created_at: Math.floor(Date.now() / 1000),
  tags: [],
  content: "hello world",
  pubkey: nostr.getPublicKey(privateKey),
};

event.id = nostr.getEventHash(event);
event.sig = nostr.signEvent(event, privateKey);

console.log(event);

const event_for_molecule = (btoa(JSON.stringify(event)));

Second Step: contract interaction

exm function:write UDyWGh541uXrCMKhAnlzYkCIstZiqJNV5S96wy-RA0g --input '{"function": "post", "text": "$POST_STRING_BODY", "nostr_event": "$EVENT_FOR_MOLECULE_STEP_1", "caller": "$NOSTR_PUBKEY"}' --token EXM_TOKEN_ID