Shard groups [ /ʃɑrd grups/ ] or Validator Sets on Radix are groups of validators responsible for storing and validating the ledger state on subsets of the Radix shardspace. Unlike the shardspace itself, which is fixed at 2^256 shards, shard groups are dynamic and can adjust their shard coverage according to demand.
Shard groups
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Radix Technical AMA #1