我如何从 Kulupu (polkadotjs) 随着时间的推移变得困难？

Question

// Import
import { ApiPromise, WsProvider } from "@polkadot/api";

// Construct
/*
https://rpc.kulupu.network
https://rpc.kulupu.network/ws
https://rpc.kulupu.corepaper.org
https://rpc.kulupu.corepaper.org/ws
*/

(async () => {
  //const wsProvider = new WsProvider('wss://rpc.polkadot.io');
  const wsProvider = new WsProvider("wss://rpc.kulupu.network/ws");
  const api = await ApiPromise.create({ provider: wsProvider });

  // Do something
  const chain = await api.rpc.system.chain();

  console.log(`You are connected to ${chain} !`);
  console.log(await api.query.difficulty.pastDifficultiesAndTimestamps.toJSON());

  console.log(api.genesisHash.toHex());
})();

Answer 1

存储项pastDifficultiesAndTimestamps 仅保存最后 60 个块的数据。要获取该信息，您只需修复以下内容：

console.log(await api.query.difficulty.pastDifficultiesAndTimestamps());

如果你想查询一个块的一般难度，这样的循环就可以了：

let best_block = await api.derive.chain.bestNumber()

// Could be 0, but that is a lot of queries...
let first_block = best_block - 100;

for (let block = first_block; block < best_block; block++) {
  let block_hash = await api.rpc.chain.getBlockHash(block);
  let difficulty = await api.query.difficulty.currentDifficulty.at(block_hash);
  console.log(block, difficulty)
}

请注意，这需要一个包含所有块信息的存档节点。否则，默认情况下，一个节点在状态修剪清理之前只存储 ~256 个先前的块。

如果您想了解如何更有效地进行这样的查询，请在此处查看我的博客 post：

https://www.shawntabrizi.com/substrate/porting-web3-js-to-polkadot-js/

我如何从 Kulupu (polkadotjs) 随着时间的推移变得困难？

How do I get difficulty over time from Kulupu (polkadotjs)?

blockchain

polkadot

polkadot-js