If I want to send some of my bitcoin to you, I publish my intention and the nodes scan the entire bitcoin network to validate that I 1) have the bitcoin that I want to send, and 2) haven't already sent it to someone else. Once that information is confirmed, my transaction gets included in a "block" which gets attached to the previous block - hence the term "blockchain." Transactions can't be undone or tampered with, because it would mean re-doing all the blocks that came after
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I checked for plagiarism..... so thanks for this comment COINDESK.COM
hehehehe...
Some people man....