After you successfully attest your steem username for the first time, you receive a reward in Bytes that depends on your reputation in Steem:
Reputation 30 or above: $10.00 reward
Reputation 40 or above: $20.00 reward
Reputation 50 or above: $40.00 reward
Reputation 60 or above: $80.00 reward
Reputation 70 or above: $160.00 reward
Half of the reward will be immediately available, the other half will be locked on a smart contract and can be spent after 1 year.