> 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/proof-of-work-the-only-viable-consensus-mechanism/pows-security-model/security-through-real-world-economics.md).

# Security Through Real-World Economics

<figure><img src="/files/bfAODSuaksXfT1hTrtwL" alt="" width="375"><figcaption></figcaption></figure>

#### The Foundation: Costly Signaling

**Proof-of-work** functions as a **costly signal**—like the extravagant tail of a peacock that demonstrates fitness through expensive display. When a miner solves the cryptographic puzzle to create a valid block, they prove they've invested significant computational resources. **This investment creates several layers of security.**

#### The Skyscraper Analogy

**Think of PoW like constructing a skyscraper** where each block is a floor. To change the foundation (early transaction), you must demolish and rebuild every floor above it. The higher the building grows, the more prohibitively expensive it becomes to alter anything at the bottom. An attacker would need to reconstruct 100 floors just to change one brick in the basement.


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