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I'm looking at the RPC spec. Many calls (eth_getBalance, eth_getStorageAt) allow for a custom "block parameter" where I can pass in any block number.

How does this work? Does each node maintain a copy of the state for each block (I assume not). Do nodes synced via --fast have access to blocks before they were fast synced?

Cheers -Aakil

Akhil F
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  • Some info and testing with historical events of geth --light at http://ethereum.stackexchange.com/a/11295/1268 . – BokkyPooBah Mar 08 '17 at 03:19

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