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Smart contracts: inspect the rules and the people who can change them
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Ethereum gas: distinguish work, price, and spending caps
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Ethereum accounts: addresses, keys, contracts, and nonces
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Bitcoin custody: who can authorize a withdrawal?
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Multisig wallets: a threshold is only the beginning
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Protocol governance: follow a proposal through to execution
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Data availability: why a valid commitment is not enough
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Rollups: separate execution speed from settlement guarantees
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Blockchain bridges: trace the claim on both sides