History retention window
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The RPC method
getFirstAvailableBlock: Returns the slot of the lowest confirmed block still available in the node's ledger — where that node's Solana history starts. getFirstAvailableBlock reference →
Applies to: All chains
In more detail
Retention is a property of each node, not of the chain. A Solana node reports the lowest confirmed slot still in its ledger through getFirstAvailableBlock; a regular TON liteserver does not store the entire block history; Stellar RPC keeps a default of 120,960 ledgers. Requests outside the window fail or return nothing, depending on the method.