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public boolean isValid() throws NoSuchAlgorithmException {
var pre = "";
for(;pre.length() < difficulty; pre += "0");
for (var i=1; i < chain.size(); ++i) {
var previousBlock = chain.get(i-1);
var currentBlock = chain.get(i);
if (!currentBlock.getHash().startsWith(pre) || !currentBlock.previousBlockHash.equals(previousBlock.getHash())) {
return false;
return true;
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