Are smart contracts secure?
The short answer is, currently, not very. While the blockchain is inherently secure, Smart Contracts suffer through the code used to create them being prone to bugs.
Considering this, do smart contracts need Blockchain?
Smart contracts allow the performance of credible transactions without third parties. One of the best things about the blockchain is that, because it is a decentralized system that exists between all permitted parties, there's no need to pay intermediaries (Middlemen) and it saves you time and conflict.
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