> 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/bitcoin-whitepaper-series/section-1-introduction-bitcoin-whitepaper/security-and-long-term-viability.md).
# Security and Long-Term Viability
*The system is secure as long as honest nodes collectively control more CPU power than any cooperating group of attacker nodes.*
\- Satoshi Nakamoto, Bitcoin Whitepaper
The security of the proposed payment system is contingent upon the collective power of honest nodes within the network. Key points include:
* **Honest Node Control**: The system remains secure as long as honest nodes collectively control more CPU power than any cooperating group of attacker nodes. This ensures that fraudulent activities can be effectively countered.
* **Proof-of-work as Enforcement**: The accumulation of work by honest nodes acts as an enforcement mechanism, allowing the network to reject blocks that include fraudulent transactions. This creates a robust defense against attacks.
* **Financial Viability of Attacks**: The high cost of performing proof of work makes it financially unviable for attackers to maintain fraudulent chains over the long term. This economic disincentive helps to preserve the integrity of the network and ensures the legitimacy of transactions.
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