API de validación

String raw = System.getProperty("os.name")
        + "|" + InetAddress.getLocalHost().getHostName();
MessageDigest md = MessageDigest.getInstance("SHA-256");
String serverId = HexFormat.of()
        .formatHex(md.digest(raw.getBytes(UTF_8)));

import { createHash } from "node:crypto";
import os from "node:os";

const raw = `${os.platform()}|${os.hostname()}`;
const serverId = createHash("sha256").update(raw).digest("hex");

import hashlib, platform, socket

raw = f"{platform.system()}|{socket.gethostname()}"
server_id = hashlib.sha256(raw.encode()).hexdigest()

using System.Security.Cryptography;
using System.Text;

var raw = $"{Environment.OSVersion.Platform}|{Environment.MachineName}";
var bytes = SHA256.HashData(Encoding.UTF8.GetBytes(raw));
var serverId = Convert.ToHexString(bytes).ToLowerInvariant();

raw := runtime.GOOS + "|" + must(os.Hostname())
sum := sha256.Sum256([]byte(raw))
serverId := hex.EncodeToString(sum[:])

curl -X POST https://licenses.rymga.com/t/acme/api/v1/validate \
  -H "Content-Type: application/json" \
  -d '{
    "licenseKey": "RYMGA-7QX4-9F2K-M8A2",
    "productCode": "MY_APP",
    "serverId": "3f9a...c1",
    "nonce": "0d1e2f3a-4b5c-6d7e-8f90-a1b2c3d4e5f6",
    "timestamp": 1733600000000
  }' -i   # -i to also see X-Signature / X-Kid headers

const res = await fetch(
  "https://licenses.rymga.com/t/acme/api/v1/validate",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      licenseKey: key, productCode: "MY_APP",
      serverId, nonce: crypto.randomUUID(),
      timestamp: Date.now(),
    }),
  },
);
const signature = res.headers.get("X-Signature");
const bodyBytes = new Uint8Array(await res.arrayBuffer());
// verify signature over bodyBytes, then JSON.parse — see next page

import json, time, uuid, urllib.request

body = json.dumps({
    "licenseKey": key, "productCode": "MY_APP",
    "serverId": server_id, "nonce": str(uuid.uuid4()),
    "timestamp": int(time.time() * 1000),
}).encode()

req = urllib.request.Request(
    "https://licenses.rymga.com/t/acme/api/v1/validate",
    data=body, headers={"Content-Type": "application/json"})
resp = urllib.request.urlopen(req)
raw = resp.read()                      # verify over these exact bytes
signature = resp.headers["X-Signature"]