Recently, a group of blockchain security companies founded the Ethereum Trust Alliance (ETA) to create a security rating system for smart contracts.
While the public Ethereum blockchain may be immutable, hackers can exploit bugs in application code or smart contracts. As of six months ago, it was estimated that at least $370 million had been lost as a result of smart contract vulnerabilities. Famous incidents include the DAO, Parity and Bancor.
As a result, there are now several security startups who perform audits and provide analysis tools.
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