"Your reward is split 50/50 between cash and a smart contract, much like rewards are split on Steem between Steem Blockchain Dollars and STEEM.

This means that 50% of the reward is spendable immediately after attestation. The other 50% is paid to a smart contract that can be unlocked after one year. Once this time period is reached you will be able to withdraw the remaining 50% of the reward."

https://steemit.com/steemit/@punqtured/official-byteball-airdrop-to-steemians