What Does “Trustless” Mean?

Bitcoin
Altcoins mean it is just you and your buyer, with nobody in the middle.

You might not often think about the system that underlies how you spend money. If you do think about it, in every transaction, there is a middleman you trust. You swipe a card, and the card processor handles the transaction, protecting both you and the merchant against fraud. You write a check, and the bank ensures you have the funds and that the other party is paid. Even paying with cash, you are using a currency monitored by a central bank, and if the cash is counterfeit, that fact will become known.

Altcoin transactions are different. You do not have to trust a third party to verify and complete your altcoin transaction. In this sense, altcoin transactions are “trustless.”

This does not mean that you should be suspicious of an altcoin transaction. In fact, the contrary is true. Why?

Let’s back up for a moment and look at the blockchain. At root, all a blockchain does is serve as a giant, public ledger. When an altcoin is mined, used as currency, or otherwise exchanged, the transaction goes on the blockchain. In order for anybody to buy and sell altcoins, their blockchains must align exactly. In other words, everybody is keeping everyone else’s books, with no central bookkeeper involved.

This is part of the system people tend to misunderstand, but it is important. Thanks to the blockchain, every altcoin transaction is recorded in a distributed ledger, meaning that it is available across multiple computers and anyone with access can see every transaction that has been recorded, all without the intervention or help of a trusted third party. You have the ledger right there in front of you, and that lets you buy and sell altcoins directly without worrying about the coins being fake. Thus, the world of altcoins is trustless, in that no middleman need be involved. You are, in effect, your own banker.

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