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fix validator guide to show that block slashing is per slot rather than per epoch

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Danny Ryan 2020-02-08 16:58:05 -07:00
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specs/phase0/validator.md
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@ -495,13 +495,13 @@ Because Phase 0 does not have shards and thus does not have Shard Committees, th
### Proposer slashing ### Proposer slashing
To avoid "proposer slashings", a validator must not sign two conflicting [`BeaconBlock`](./beacon-chain.md#beaconblock) where conflicting is defined as two distinct blocks within the same epoch. To avoid "proposer slashings", a validator must not sign two conflicting [`BeaconBlock`](./beacon-chain.md#beaconblock) where conflicting is defined as two distinct blocks within the same slot.
*In Phase 0, as long as the validator does not sign two different beacon blocks for the same epoch, the validator is safe against proposer slashings.* *In Phase 0, as long as the validator does not sign two different beacon blocks for the same slot, the validator is safe against proposer slashings.*
Specifically, when signing a `BeaconBlock`, a validator should perform the following steps in the following order: Specifically, when signing a `BeaconBlock`, a validator should perform the following steps in the following order:
1. Save a record to hard disk that a beacon block has been signed for the `epoch=compute_epoch_at_slot(block.slot)`. 1. Save a record to hard disk that a beacon block has been signed for the `slot=block.slot`.
2. Generate and broadcast the block. 2. Generate and broadcast the block.
If the software crashes at some point within this routine, then when the validator comes back online, the hard disk has the record of the *potentially* signed/broadcast block and can effectively avoid slashing. If the software crashes at some point within this routine, then when the validator comes back online, the hard disk has the record of the *potentially* signed/broadcast block and can effectively avoid slashing.