> For the complete documentation index, see [llms.txt](https://hub.bsvblockchain.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hub.bsvblockchain.org/higher-learning/bsv-academy/bsv-basics-protocol-and-design/introduction-to-bitcoin-protocol-and-design/the-role-of-cryptography.md).
# The Role of Cryptography
Cryptography is a **fundamental aspect of Bitcoin's security framework**. It ensures that transactions are secure, verifiable, and immutable. Each **block of transactions is cryptographically linked to the previous block**, creating a **blockchain that is resistant to tampering**. This cryptographic foundation is what allows Bitcoin to operate in a decentralized manner, free from the control of any single entity
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