Update index.md to explain why SHA-256 hashes are used in blockchains… #15017
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… Updated explanation on why SHA-256 is used in blockchains in context to Anders Brownworth's demo video
Description
Added a paragraph explaining why SHA-256 is used in blockchains, covering its role in data integrity, security, immutability, and Proof of Work. Also highlighted its resistance to tampering and efficient verification process.
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