80% will be locked for two years in a smart contract that will buy back BNT for 0.01 ETH (the initial price) whenever it is available, according to its calculated price.
The Community of the Currency
Galia Benartzi

This two-year peg seems like a brilliant way of ensuring price stability — by eliminating up any possibility of BNT supply outpacing its demand — until people believe/understand that BNT is as valuable as, or more valuable than ETH. It seems like it could be pretty expensive to do, but probably worth it.

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