nim-codex/docs/DownloadFlow.md

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Download Flow

Sequence of interactions that result in dat blocks being transferred across the network.

Local Store

When data is available in the local blockstore,

Network Store

When data is not found ih the local blockstore, the block-exchange engine is used to discover the location of the block within the network. Connection will be established to the node(s) that have the block, and exchange can take place.