import { MultisigThresholdPubkey, pubkeyToAddress } from "@cosmjs/amino";

// https://github.com/cosmos/cosmjs/issues/673#issuecomment-779847238
const multisigPubkey: MultisigThresholdPubkey = {
  "type": "tendermint/PubKeyMultisigThreshold",
  "value": {
    "threshold": "3",
    "pubkeys": [
      {
        "type": "tendermint/PubKeySecp256k1",
        "value": "A4KZH7VSRwW/6RTExROivRYKsQP63LnGcBlXFo+eKGpQ"
      },
      {
        "type": "tendermint/PubKeySecp256k1",
        "value": "A8/Cq4VigOnDgl6RSdcx97fjrdCo/qwAX6C34n7ZDZLs"
      },
      {
        "type": "tendermint/PubKeySecp256k1",
        "value": "ApKgZuwy03xgdRnXqG6yEHATomsWDOPacy7nbpsuUCSS"
      },
      {
        "type": "tendermint/PubKeySecp256k1",
        "value": "Aptm8E3WSSFS0RTAIUW+bLi/slYnTEE+h4qPTG28CHfq"
      }
    ]
  }
};

const address = pubkeyToAddress(multisigPubkey, "cosmos");
console.log(address);