> For the complete documentation index, see [llms.txt](https://shai-deshe.gitbook.io/pow-book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags.md).

# Part 1: BlockChains and BlockDAGs

- [Introduction](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/introduction.md)
- [Chapter 1: Proof-of-Work (PoW)](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-1-bft-vs.-pow.md)
- [Byzantine Fault Tolerance (BFT)](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-1-bft-vs.-pow/byzantine-fault-tolerance.md)
- [What PoW does?](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-1-bft-vs.-pow/proof-of-work.md)
- [What About Proof-of-Stake?](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-1-bft-vs.-pow/bft-vs.-pow.md)
- [How PoW Works](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-1-bft-vs.-pow/how-pow-works.md)
- [Difficulty Adjustment](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-1-bft-vs.-pow/difficulty-adjustment.md)
- [Merged Mining and Multi-Mining](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-1-bft-vs.-pow/merged-mining-and-multi-mining.md)
- [Exercises](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-1-bft-vs.-pow/exercises.md)
- [Chapter 2: the Block Chain Paradigm](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm.md)
- [A Graph Theory Primer](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/a-graph-theory-primer.md)
- [The Paradigm](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/the-paradigm.md)
- [Honesty and Rationality](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/honesty-and-rationality.md)
- [Three Chain Selection Rules](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/three-chain-selection-rules.md)
- [Security Notions](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/security-notions.md)
- [A Security Model for Blockchain Consensus](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/a-security-model-for-blockchain-consensus.md)
- [Selfish Mining in Bitcoin](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/selfish-mining-in-bitcoin.md)
- [Safety](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/safety.md)
- [Liveness](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/liveness.md)
- [Confirmation Times](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/confirmation-times.md)
- [Proving Bitcoin's Security\*](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/proving-bitcoins-security.md)
- [Exercises](https://shai-deshe.gitbook.io/pow-book/part-1-blockchains-and-blockdags/chapter-2-the-block-chain-paradigm/exercises.md)