What is Blockchain?

What is the Blockchain? Blockchain is a decentralized leger. So what does that mean? A leger can be thought of as a record of past transactions. Decentralized means that no one party is in-chare of it. Why does this matter? Are you aware that banks sometimes commit fraud on their own clients' accounts'? "Wells Fargo account fraud scandal" https://en.wikipedia.org/wiki/Wells_Fargo_account_fraud_scandal

So how does the blockchain prevent this? Everytime a new block is created, it creates a hash function. It will look something like ac58dac85... Example, another block might start of with ccc58ac94...

"Each block header contains a version number, a timestamp, the hash used in the previous block, the hash of the Merkle Root, the nonce, and the target hash." https://www.investopedia.com/terms/h/hash.asp

The hash of a block should NEVER change. If it does, it is a sign that the secuity has been attacked. Since the blockchain is decentralized, this will cause different records.

If one computer shows the hash after the change go from a575bc589c to c5925ac81 but 10,000 other computers have the original hash, the blockchain will disregard the change. Why?

The chain works off of consensus. The computers with the most blocks on the node win out over someone trying to hack the network. 1 bad computer vs. 10,000 honest records will lose.