The base token distribution formula is very simple: for every 1 ETH you contribute, you'll receive 100 UET , and if you contribute at least 0.01 ETH , you'll also receive an additional 1 UET for every Ether that's been contributed in total. Like this:

The more Ether everyone contributes, the more tokens you get.

Bonus tokens!

Every block has a 1 in 256 chance of issuing bonus tokens.

When purchasing UET, the smart contract will take a hash of the current block's coinbase, number, and timestamp. If the first byte of the hash is 0x00, the block becomes a bonus block. During a bonus block, the smart contract counts the number of bits set in the second byte of the hash and uses that number as a bonus multiplier.

Every UET purchase of at least 0.01 ETH worth during the bonus block will receive, in addition to the base distribution, an additional 100 UET per Ether multiplied by the bonus multiplier. That means that contributors have a chance of receiving a total of nine times the number of tokens they expected!