diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md index a2634c11a..50351106d 100644 --- a/specs/core/0_beacon-chain.md +++ b/specs/core/0_beacon-chain.md @@ -779,12 +779,13 @@ def lmd_ghost(store: Store, start_state: BeaconState, start_block: BeaconBlock) ## Beacon chain state transition function -We now define the state transition function. At a high level the state transition is made up of two parts: +We now define the state transition function. At a high level the state transition is made up of three parts: -1. The per-slot transitions, which happens every slot, and only affects a parts of the `state`. -2. The per-epoch transitions, which happens in the last slot of every epoch (i.e. `(state.slot + 1) % EPOCH_LENGTH == 0`), and affects the entire `state`. +1. The per-slot transitions, which happens every slot. +2. The per-block transitions, which happens at every block. +3. The per-epoch transitions, which happens at every epoch boundary (i.e. `(state.slot + 1) % EPOCH_LENGTH == 0`). -The per-slot transitions generally focus on verifying aggregate signatures and saving temporary records relating to the per-slot activity in the `BeaconState`. The per-epoch transitions focus on the [validator](#dfn-validator) registry, including adjusting balances and activating and exiting [validators](#dfn-validator), as well as processing crosslinks and managing block justification/finalization. +The per-slot transitions focus on the slot counter and block roots records updates; the per-block transitions generally focus on verifying aggregate signatures and saving temporary records relating to the per-block activity in the `BeaconState`; the per-epoch transitions focus on the [validator](#dfn-validator) registry, including adjusting balances and activating and exiting [validators](#dfn-validator), as well as processing crosslinks and managing block justification/finalization. ### Helper functions