sign.js

const dsteem = require('dsteem');
const client = new dsteem.Client('https://api.steemit.com');
require('dotenv').config();
createTx();

async function createTx() {

    // max expiration time is 1h but it sometimes fails at exactly one hour.
    const expireTime = 1000 * 3590;
    const props = await client.database.getDynamicGlobalProperties();
    const ref_block_num = props.head_block_number & 0xFFFF;
    const ref_block_prefix = Buffer.from(props.head_block_id, 'hex').readUInt32LE(4);
    const expiration = new Date(Date.now() + expireTime).toISOString().slice(0, -5);
    const extensions = [];
    // Example operation for sending 5 STEEM to @stoodkev
    const operations = [
        ['transfer',
            {
                'amount': '5.000 STEEM',
                'from': 'multisig',
                'memo': '',
                'to': 'stoodkev'
            }
        ]
    ];
    const tx = {
        expiration,
        extensions,
        operations,
        ref_block_num,
        ref_block_prefix,
    }

    // Sign via @multisig @steem-plus and @steemplus-pay (combined weight of 45% > 40% threshold)

    const signMultisig = client.broadcast.sign(tx, dsteem.PrivateKey.from(process.env.ACTIVE_MULTISIG));
    //const sendMultisig= await client.broadcast.send(signMultisig);
    //console.log(sendMultisig);
    // Failing due to "Missing Active Authority" (weight inferior to the threshold)
    const signSteemPlus = client.broadcast.sign(signMultisig, dsteem.PrivateKey.from(process.env.ACTIVE_SP));
    const signSteemPlusPay = client.broadcast.sign(signSteemPlus, dsteem.PrivateKey.from(process.env.ACTIVE_SPP));
    console.log(signSteemPlusPay);
    // Send the broadcast
    const send = await client.broadcast.send(signSteemPlusPay);
    console.log(send); // Success
}