Blog about the book Mastering Blockchain written by Imran Bashir and Blockchain technology, distributed systems, cryptography, blockchain security, consensus algorithms, Bitcoin, cryptocurrencies, smart contracts, Decentralization, Ethereum, hyperledger, artificial intelligence, IoT and a lot more!
Tuesday, May 1, 2018
How Blockchains are immutable
Immutability is a crucial feature of blockchains: records once added in the blockchain are immutable. There is the possibility of rolling back the changes, but this is considered almost impossible to do as it will require an unaffordable amount of computing resources. For example, in case of bitcoin if a malicious user wants to alter the previous blocks, then it would need computing the Proof of Work (PoW) again for all those blocks that have already been added to the blockchain. This difficulty of redoing the PoW makes the records on a blockchain practically immutable.
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The diagram below shows the design of the EVM where virtual ROM (right) stores the program code which is copied into main memory by using C...
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