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Merge pull request #318 from ethereum/vbuterin-patch-16 

Clarify block hash -> block root
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Hsiao-Wei Wang 2018-12-14 13:44:31 +08:00 committed by GitHub
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5
specs/core/0_beacon-chain.md
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@ -140,6 +140,7 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
* **Attester** - a [validator](#dfn-validator) that is part of a committee that needs to sign off on a beacon chain block while simultaneously creating a link (crosslink) to a recent shard block on a particular shard chain. * **Attester** - a [validator](#dfn-validator) that is part of a committee that needs to sign off on a beacon chain block while simultaneously creating a link (crosslink) to a recent shard block on a particular shard chain.
* **Beacon chain** - the central PoS chain that is the base of the sharding system. * **Beacon chain** - the central PoS chain that is the base of the sharding system.
* **Shard chain** - one of the chains on which user transactions take place and account data is stored. * **Shard chain** - one of the chains on which user transactions take place and account data is stored.
* **Block root** - a 32-byte Merkle root of a beacon chain block or shard chain block. Previously called "block hash".
* **Crosslink** - a set of signatures from a committee attesting to a block in a shard chain, which can be included into the beacon chain. Crosslinks are the main means by which the beacon chain "learns about" the updated state of shard chains. * **Crosslink** - a set of signatures from a committee attesting to a block in a shard chain, which can be included into the beacon chain. Crosslinks are the main means by which the beacon chain "learns about" the updated state of shard chains.
* **Slot** - a period of `SLOT_DURATION` seconds, during which one proposer has the ability to create a beacon chain block and some attesters have the ability to make attestations * **Slot** - a period of `SLOT_DURATION` seconds, during which one proposer has the ability to create a beacon chain block and some attesters have the ability to make attestations
* **Epoch** - an aligned span of slots during which all [validators](#dfn-validator) get exactly one chance to make an attestation * **Epoch** - an aligned span of slots during which all [validators](#dfn-validator) get exactly one chance to make an attestation
@ -508,7 +509,7 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
{ {
# Slot number # Slot number
'slot': 'uint64', 'slot': 'uint64',
# Shard block hash # Shard block root
'shard_block_root': 'hash32', 'shard_block_root': 'hash32',
} }
``` ```
@ -894,7 +895,7 @@ def get_shard_committees_at_slot(state: BeaconState,
def get_block_root(state: BeaconState, def get_block_root(state: BeaconState,
slot: int) -> Hash32: slot: int) -> Hash32:
""" """
Returns the block hash at a recent ``slot``. Returns the block root at a recent ``slot``.
""" """
earliest_slot_in_array = state.slot - len(state.latest_block_roots) earliest_slot_in_array = state.slot - len(state.latest_block_roots)
assert earliest_slot_in_array <= slot < state.slot assert earliest_slot_in_array <= slot < state.slot