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Fernando Bittencourt
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Liquidation usually occurs when your trade has suffered a large loss. Between 50% and 30% of your collateral defined by the Exchange used.

When this happens, the Exchange sells its collateral to cover the loss and close the trade. The trader keeps the remaining balance.

This only happens in leveraged trades where the trader borrows money from the Exchange to trade.

If you look at these blocks, they are usually discovered very shortly after the previous block. This means that the miner had not yet selected the transactions and verified them. Until they do this, to avoid wasting processing time on their equipment, they try to mine empty blocks and sometimes get lucky. If it was a block much later than the previous one, then it is just a miner who is doing his job poorly.

I add up the costs and divide by the quantity to get an average price. But lately I've realized that it's not worth counting imaginary profits because I'm not going to sell them. I've shifted my attention to new ways to get more BTC.

Eu somo os custos e divido pela quantidade para ter um preço médio. Mas ultimamente vi que não vale a pena ficar a contabilizar lucros imaginários pois não vou vender eles. Mudei as atenções para novas formas de conseguir mais BTC.

This is a feature that the customer needs to implement. I don't see the need for a PIN. But notifications are a bit complex, as they require customers to be connected and receive notifications from numerous relays 24/7. The data consumption of cell phones will harm the battery.