shard

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executor

Bribing attacker model

Coordinated choice

Uncoordinated majority

Honest majority

security

scalability

decentralizaton

Light node

Single-shard node

Top-level node

Super-full node

archival node

notary

Collation header C1_2 (shard id, period index)

C3_2

C5_4

Cn_m

collator proposers prolators

validators (150)

client

block

collation

collation1

c2

c3

sharding

VMC

Block

B5

B6

B7

B8

B9

B0

B1

B2

B3

B4

shard chain 100

shard chain 1

shard chain 0

challanges

Single-shard takeover attacks

Fraud detection

Cross shard communication

The data availability problem

nodes