The Aptos architecture involves participation at various levels:
*Blockchain is formed by validators that confirm user transactions
*Coin holders block or place their funds on the addresses of selected validators.
*Clients are any part of the system that will send transactions, request blockchain history or other data.
*Light clients only support a limited set of current validators and can securely request partial blockchain state from full nodes.
*Full nodes are clients that create a copy of the transaction state and blockchain from validators or other full nodes on the network.