turn a list of accounts into basic list of transaction outputs.

NOTE: If store is nil, creates a new MemKVStore.

Creates a PrivAccount from secret.

Make `num` random accounts.

Types of Tx implementations.

Types of Tx implementations.

Types of Tx implementations.

Account transactions.

A Cache that enforces deterministic sync order.

TxS add json serialization to Tx.

Tx (Transaction) is an atomic operation on the ledger state.