sync with latest spec, closes #2
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mratsim
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@ -12,31 +12,69 @@ import intsets, eth_common, math
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type
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Keccak256_Digest* = Hash256 # TODO, previously Keccak256 fields used the "bytes" type
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Blake2_256_Digest* = Hash256 # while Blake2 used hash32, but latest spec changed everything to hash32
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Blake2_256_Digest* = Hash256 # while Blake2 used hash32, but latest spec changed everything to hash32
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Uint24* = range[0'u32 .. 0xFFFFFF'u32] # TODO: wrap-around
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BeaconBlock* = object
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parentHash*: Keccak256_Digest # Hash of the parent block
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slotNumber*: int64 # Slot number (for the PoS mechanism)
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randaoReveal*: Keccak256_Digest # Randao commitment reveal
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attestationVotes*: seq[AttestationVote] # Attestation votes
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mainChainRef*: Keccak256_Digest # Reference to main chain block
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activeStatehash*: Blake2_256_Digest # Hash of the active state
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crystallizedStateHash*: Blake2_256_Digest # Hash of the crystallized state
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parent_hash*: Keccak256_Digest # Hash of the parent block
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slot_number*: int64 # Slot number (for the PoS mechanism)
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randao_reveal*: Keccak256_Digest # Randao commitment reveal
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attestations*: seq[AttestationRecord] # Attestation votes
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pow_chain_ref*: Keccak256_Digest # Reference to main chain block
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active_state_root*: Blake2_256_Digest # Hash of the active state
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crystallized_state_root*: Blake2_256_Digest # Hash of the crystallized state
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AttestationVote* = object
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height*: int16
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parentHash*: Keccak256_Digest
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checkpointHash*: Blake2_256_Digest
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shardId*: int16
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shardBlockHash*: Keccak256_Digest
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attesterBitfield*: IntSet
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aggregateSig*: seq[BLSPublicKey]
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ActiveState* = object
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pending_attestations*: seq[AttestationRecord] # Attestations that have not yet been processed
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recent_block_hashes*: seq[Keccak256_Digest] # Most recent 2 * CYCLE_LENGTH block hashes, older to newer
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ActiveState* = IntSet
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# ## Spec
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# attestation_count: int64
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# attester_bitfields: seq[byte]
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CrystallizedState* = object
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validators*: seq[ValidatorRecord] # List of active validators
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last_state_recalc*: int64 # Last CrystallizedState recalculation
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indices_for_heights*: seq[seq[ShardAndCommittee]]
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# What active validators are part of the attester set
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# at what height, and in what shard. Starts at slot
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# last_state_recalc - CYCLE_LENGTH
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last_justified_slot*: int64 # The last justified slot
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justified_streak*: int16 # Number of consecutive justified slots ending at this one
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last_finalized_slot*: int64 # The last finalized slot
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current_dynasty*: int64 # The current dynasty
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crosslinking_start_shard*: int16 # The next shard that cross-linking assignment will start from
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crosslink_records*: seq[CrosslinkRecord] # Records about the most recent crosslink for each shard
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total_deposits*: Int256 # Total balance of deposits
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dynasty_seed*: Keccak256_Digest # Used to select the committees for each shard
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dynasty_seed_last_reset*: int64 # Last epoch the crosslink seed was reset
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ShardAndCommittee = object
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shard_id*: int16 # The shard ID
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committee*: seq[Uint24] # Validator indices
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ValidatorRecord* = object
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pubkey*: BLSPublicKey # The validator's public key
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withdrawal_shard*: int16 # What shard the validator's balance will be sent to after withdrawal
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withdrawal_address*: EthAddress # And what address
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randao_commitment*: Keccak256_Digest # The validator's current RANDAO beacon commitment
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balance*: int64 # Current balance
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start_dynasty*: int64 # Dynasty where the validator is inducted
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end_dynasty*: int64 # Dynasty where the validator leaves
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CrosslinkRecord* = object
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dynasty: int64 # What dynasty the crosslink was submitted in
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hash: Keccak256_Digest # The block hash
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BLSPublicKey = object
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# Stub for BLS signature
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data: array[32, byte]
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AttestationRecord* = object
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slot*: int64 # Slot number
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shard_id*: int16 # Shard ID
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oblique_parent_hashes*: seq[Keccak256_Digest]
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# List of block hashes that this signature is signing over that
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# are NOT part of the current chain, in order of oldest to newest
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shard_block_hash*: Keccak256_Digest # Block hash in the in the shard that we are attesting to
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attester_bitfield*: IntSet # Who is participating
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aggregateSig*: seq[BLSPublicKey] # The actual signature
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# Note:
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# We use IntSet from Nim Standard library which are efficient sparse bitsets.
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# See: https://nim-lang.org/docs/intsets.html
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@ -51,44 +89,11 @@ type
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#
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# Also, IntSets uses machine int size while we require int64 even on 32-bit platform.
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CrystallizedState* = object
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activeValidators*: seq[ValidatorRecord] # List of active validators
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queuedValidators*: seq[ValidatorRecord] # List of joined but not yet inducted validators
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exitedValidators*: seq[ValidatorRecord] # List of removed validators pending withdrawal
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currentEpoch*: int64 # The current epoch
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currentEpochShuffling*: seq[int32] #int24 # The permutation of validators used to determine who cross-links what shard in this epoch
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lastJustifiedEpoch*: int64 # The last justified epoch
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lastFinalizedEpoch*: int64 # The last finalized epoch
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currentDynasty*: int64 # The current dynasty
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nextShard*: int16 # The next shard that cross-linking assignment will start from
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currentCheckpoint*: Keccak256_Digest # The current FFG checkpoint
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crosslinkRecords*: seq[CrosslinkRecord] # Records about the most recent crosslink `for each shard
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totalDeposits*: Int256 # Total balance of deposits
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crosslinkSeed*: Keccak256_Digest # Used to select the committees for each shard
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crosslinkSeedLastReset*: int64 # Last epoch the crosslink seed was reset
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BLSPublicKey = object
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# Stub for BLS signature
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data: array[32, byte]
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ValidatorRecord* = object
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pubkey: BLSPublicKey # The validator's public key
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withdrawalShard: int16 # What shard the validator's balance will be sent to after withdrawal
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withdrawalAddress: EthAddress # And what address
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randaoCommitment: Keccak256_Digest # The validator's current RANDAO beacon commitment
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balance: int64 # Current balance
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switchDynasty: int64 # Dynasty where the validator can (be inducted | be removed | withdraw their balance)
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CrosslinkRecord* = object
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epoch: int64 # What epoch the crosslink was submitted in
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hash: Keccak256_Digest # The block hash
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const
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ShardCount* = 1024 # a constant referring to the number of shards
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EthSupplyCap* = 2^27 # ~= 134 million
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DepositSize* = 32 # You need to deposit 32 ETH to be a validator in Casper
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MaxValidatorCount* = EthSupplyCap div DepositSize # 4_194_304
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EpochLength* = 64 # blocks
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MaxValidatorCount* = 2^22 # 4_194_304, this means that ~132M ETH can stake at the same time (= MaxValidator Count * DepositSize)
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SlotDuration* = 8 # seconds
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CycleLength* = 64 # slots
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MinCommitteeSize* = 128 # (rationale: see recommended minimum 111 here https://vitalik.ca/files/Ithaca201807_Sharding.pdf)
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EndEpochGracePeriod* = 8 # blocks
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