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The execution phase of the program is commonly the heaviest portion of the fault proof program, where the computation that is being verified is performed. This phase consumes the outputs of the prologue phase, and performs the bulk of the verifiable computation. After execution has concluded, the outputs are passed along to the epilogue phase for final verification.

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Example

At a high-level, in the kona-client program, the execution phase:
  1. Derives the inputs to the L2 derivation pipeline by unrolling the L1 head hash fetched in the epilogue.
  2. Passes the inputs to the L2 derivation pipeline, producing the L2 execution payloads required to reproduce the L2 safe chain at the claimed height.
  3. Executes the payloads produced by the L2 derivation pipeline, producing the L2 output root at the L2 claim height.