文件存 3 家，权限靠 签名Files on 3 operators, access by signature

import * as T from '/TapeRelay/client/src/index.mjs';
// account：用户的电路（链上名字）；servers：发现文件里的 3 台；app：你的电路// account: the user's circuit (on-chain name); servers: the 3 in its discovery file; app: your circuit

const client = T.createClient({ fetch });
const [address] = await window.ethereum.request({ method: 'eth_requestAccounts' });
const wallet = T.eip1193Wallet(window.ethereum, address);  // 钱包要在 BNB Smart Chain 上// the wallet must be on BNB Smart Chain

// 授权一次：钱包签名，写明应用和范围// Authorize once: one wallet signature naming the app and scopes
const session = await T.authorizeSession({
  wallet, account, app,
  scopes: ['objects', 'pointers'],
  servers,
  now: Math.floor(Date.now() / 1000),
  seconds: 8 * 3600,
});
const auth = T.sessionAuth(session);
// 模版 A 换成：T.remoteAuth({ account, endpoint })// Template A instead: T.remoteAuth({ account, endpoint })

// 同时传 3 台，存好 2 台就返回// Upload to all 3; returns once 2 have it
const plan = await T.planPublicFile(file, {
  name: file.name, contentType: file.type, withManifest: true,
});
const up = await T.uploadToServers(client, servers, auth, file, { plan });

// 播放：按文件读取的网址，不要签名// Play: a file URL, no signature needed
video.src = T.fileUrl(up.ok[0], account, plan.manifestObject.sha256);