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Bitcoin mining: from candidate block to accepted history
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Ethereum accounts: addresses, keys, contracts, and nonces
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Ethereum gas: distinguish work, price, and spending caps
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Ethereum finality: from a quick receipt to finalized settlement
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Smart contracts: inspect the rules and the people who can change them
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Token approvals: understand the permission before the swap
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Token supply: read minting, burning, vesting, and circulation separately
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Token decimals: translate raw balances without changing value
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Stablecoin mechanics: identify the route back to the target value