Transactions – Blockchain.com websocket not working

I had to resolve the issue by listening to all transactions and verifying addresses as follows:

ws.addEventListener('open', () => 
    ws.send(JSON.stringify(
        "op": "unconfirmed_sub"
    ));
);

ws.addEventListener('message', (res) => 
    let data = JSON.parse(res.data);
    let outs = data.x.out;
    let out = outs.find(o => 
        return String(o.addr).toLowerCase() == receiver.toLowerCase();
    );
    if (out) 
        setTimeout(() => 
           startCallback(data);
        , 6000);
    
);