doc.go

/*
Package das contains the most important functionality provided by celestia-node.
It contains logic for running data availability sampling (DAS) routines on block
headers in the network. DAS is the process of verifying the availability of block
data by sampling chunks or shares of those blocks.

Package das can confirm the availability of block data in the network via the
Availability interface which is implemented both in `full` and `light` mode.
`Full` availability ensures the full reparation of a block's data square (meaning
the instance will sample for enough shares to be able to fully repair the block's
data square) while `light` availability samples for shares randomly until it is
sufficiently likely that all block data is available as it is assumed that there
are enough `light` availability instances active on the network doing sampling over
the same block to collectively verify its availability.

The central component of this package is the `DASer`. It performs one basic function:
a sampling loop that performs DAS on new ExtendedHeaders in the network. The DASer kicks
off this loop by loading its last DASed header (`checkpoint`) and kicking off a `catchUp`
loop to DAS all headers between the checkpoint and the current network head. It simultaneously
continues to perform DAS over new ExtendedHeaders received via gossipsub.
*/
package das