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It is a way of investing by borrowing money from a broker (or in crypto, an exchange or platform) to trade. The borrowing requires you to collateralize a minimum value of your own assets. If during the trade, the market moves negatively to your trade, a margin call will takes place so that your trade account retains the ratio of your borrowed funds to the collateralized assets.
A type of digital signature performed in a group where it becomes impossible to determine which member's key in the group were used for the digital signature.