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Data structureComponents
SIze per object
Max per block
Avg per block
Reasoning for avg
Max total size
Avg total size
Compressibility
Rationale
Avg post compression
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Signed HeaderSlotParent rootState rootBody rootSignature
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832323296200
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Signed beacon block top and tailSlotParent rootState rootSignature
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832329616811Duh1681681Headers are too small, don't bother168
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Randao reveal96961196
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Eth1Data72721172
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Graffiti32321132
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ProposerSlashingIndexHeaders
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8400408160.125Cannot be long-run faster than withdrawal queue (4 per 32 blocks)6528511Not large enough, don't bother51
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CheckpointEpochRoot
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83240
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CrosslinkShardParent rootStart epochEnd epochData root
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832883288
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AttestationDataSlotIndexBlockRootSourceTarget
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88324040128
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IndexedAttestationCustody bit indicesAttestation dataSignature
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163841289616608
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AttesterSlashing
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332163321610.125Cannot be long-run faster than withdrawal queue (4 per 32 blocks)3321641525.818181818Only 2.75 of 8 bytes are used for indices. Also, validator index lists can be re-expressed as difference lists (eg. 10 35 43 50 79 -> 10 25 8 7 29), likely reduces by a factor of 2x713.625
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AttestationAttestationDataAggregation bitfieldSignature
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1282569648012864Assuming 1/2 of perfect efficiency61440307201.5Most AttestationData is identical between multiple objects, attestation bitfield can be compressed if portion of bits filled not exactly 1/2, custody bitfield can be compressed as it must be a subset of attestation bitfield20480
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DepositDataPubkeyWithdrawal credentialsAmountSignature
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4832896184
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DepositBranchDepositData
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10561841240160.8128m ETH over 2 years = 4m deposits per year, 2 years ~= 5m slots198409923Adjacent Merkle branches mostly share data330.6666667
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Signed VoluntaryExitEpochValidator indexSignature
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8896112160.125Cannot be long-run faster than withdrawal queue (4 per 32 blocks)1792141Too small, don't bother14
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Phase0 TOTAL1231843609721757.29167
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Phase 1 below
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Attestation custody bits
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25625676864196608163841.510922.66667
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ShardTransition (avg)Start slotShard block lengthsShard data rootsIntermediate statesSignature
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88483296192064012288112288
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ShardTransition (max)Start slotShard block lengthsShard data rootsIntermediate statesSignature
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8961536384962120640135680010
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Shard block fraud proofMax shard block size
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1048576104857610.03125104857632768132768
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CustodySlashingData indexMalefactor indexMalefactor secretWhistleblower indexShardTransitionAttestationData
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8896821204801048576105129610.03125105129632853132853
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CustodyKeyRevealRevealer indexReveal
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896104256324m validators revealing once per 2048-epoch (65536-slot) period26624332813328
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EarlyDerivedSecretRevealRevealed indexEpochReveal
Masker indexMask
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889683215210.06251529.519.5
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Light client signature bitfieldBitfield
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3232113232132
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Light client signatureSignature
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9696119696196
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Phase0+1 TOTAL2582248133855.5114054.4583
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* note this is avg total size in the worst case number of validators
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