Rustbits are Counterparty tokens which will provide the game fuel and also act as a premium in game currency.
There is a limited supply of RustBits which will be burned as new Rustchain cards are created for SpacePirate. The tokens will be put on a swapbot at Tokenly, unsold rustbits will be burnt at the end of the sale.
Rustchain cards are Counterparty assets that players can collect and trade or use to enhance their experience in the game. In order to issue cards, Rustbits will be burnt as new cards are created and distributed.