// Default int will be 0. We do not know if this refers to the 0th hash or it just means the hash was not found.
// So let's check if the height contains or not.
// If the given height is 0, then check if the chain has a key with 0. If it does not have, then return false. If it has, check if the hash is the same or not.
if (Height==0&& (!Chain.ContainsKey(0) ||Chain !=hash))
if (height==0&& (!Chain.ContainsKey(0) ||Chain !=hash))
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