Ledger is the core concept of Radard. We save all the transaction records, account settings, balance changes to the Ledgers. Account Activation is a procedure to save one account into the ledger. It needs one transaction at least. All this is called Account Activation.
In Radr system，We introduce a new transaction type: ActiveAccount. It's used to activate accounts. Accounts existed in Radr system can make this transaction to accomplish transfer funds, activation, referee adding.