Questions tagged [immutability]

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How permanent is data stored in Ethereum?

Does it all depend on the availability of nodes? What if say there's 1 node left in Ethereum, will that node contains the entire blockchain?
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What happens to immutable contracts when Ethereum 2.0 will likely change the 15s block time?

Immutable contracts that need to have a time system for handling their functions process are mostly based on block.number system. They assume there is about 15seconds between each block and thus ...
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How the “data” field of transaction is saved in the Ethereum blockchain? [closed]

as I imagine there are 2 options: in pseudo language: 1) block.add(tx.data); block.calculate_hash_for_blockchain(); 2) block.add(some_hash_function(tx.data)); block.calculate_hash_for_blockchain(); ...
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Demonstrate immutability in an Ethereum blockchain

I am currently using a private Ethereum setup with 3 nodes. As part of the demo of my project, I need to demonstrate that Ethereum is immutable. How do I show it using geth? The audience of my ...
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How do we achieve immutability within a contract on the blockchain?

Am relatively new to the realm of Dapps and blockchain in general, and if you ask someone well-informed about the characteristics of blockchains, the word "immutable" will invariably appear in the ...