This is a quote from the book "Bitcoin: A Peer-to-Peer Electronic Cash System" by Satoshi Nakamoto
...e rules, such rules that favour him with more new coins than everyone else combined, than to undermine the system and the validity of his own wealth.
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7. Reclaiming Disk Space
Once the latest transaction in a coin is buried under enough blocks, the spent transactions before it can be discarded to save disk space. To facilitate this without breaking the block&ap
os;s hash, transactions are hashed in a Merkle Tree , with only the root included in the block's hash. Old blocks can then be compacted by stubbing off branches of the tree. The in...