Re:No, you don't need a blockchain
by azamatms on Friday November 02, 2018 @12:21PM
(#18364254)
Bitcoin for example (and many others), will prune old blocks that are no longer required to make transactions on the network. If a block has all unspent inputs used up, the block will be pruned
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That is a logical solution for Bitcoin. Doesn't Etherium track transactions back to the beginning of time though? That sounds like a Shlemiel The Painter problem.
There's already full-node implementations that address state tree pruning: https://wiki.parity.io/Getting-Synced#database-pruning