Common
getBlockInfo
You can use this function to get block info in Zeitgeist.
const api = await ApiPromise.create({ provider });
const [blockNumber] = await Promise.all([api.rpc.chain.getHeader()]);
getChainInfo
You can use this function to get chain info about Zeitgeiest.
const api = await ApiPromise.create({ provider });
const [chain, nodeName, nodeVersion] = await Promise.all([
  api.rpc.system.chain(),
  api.rpc.system.name(),
  api.rpc.system.version(),
]);