How exchanges generate transactions for all cryptocurrencies and send it to their network nodes?

How exchanges generate transactions for all cryptocurrencies and send it to their network nodes?

This is an important question for me, I know some Bitcoin wallets like blockchain.info are a Full Node, but exchanges which support so many coins, how do they create transactions per cryptocurrency? do they have a full node client for per cryptocurrency?

Just Bitcoin needs 170 GB space disk!

Are exchanges using third-party servers and apis?

https://ift.tt/2Ocv80y

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