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  "map_content": "2) What non-mining full nodes add in practice\n- Define the payoff surface: By refusing to accept invalid blocks/txs and by not relaying them, they ensure that \u201clongest chain\u201d isn\u2019t sufficient for economic finality unless it also satisfies the rules those nodes enforce. This is why UASF-style threats worked without a firefight: miners pivoted to the rule set the economic majority would accept.\n- Reduce collusion risk: If the network were mostly SPV (longest-chain followers), a majority of hashpower could more safely change rules; with widespread validation, such a move strands their coins.\n- Network resilience: Independent nodes diversify propagation paths, making censorship/eclipsing harder and double-spend detection easier at the edges. They\u2019re not in the block-production path, but they shape which chain is economically usable.",
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