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Transaction malleability problem
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<p>The transaction malleability problem is a vulnerability in <a href="/facts/Blockchain/8H43GgWy">blockchain</a> which can be exploited by altering a <a href="/facts/Cryptographic_hash_function/cuxkgbST">cryptographic hash</a>, such as the digital signature used to identify a cryptocurrency transaction. Transaction malleability is considered to be one of the largest ongoing threats to blockchain technology, as it can compromise financial transactions such as <a href="/facts/Bitcoin/UJvqfray">Bitcoin</a> and other cryptocurrency transactions, and cause other issues in the network. </p>