kvhnuke/survey-giveaway.md

## survey-giveaway.md

      
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              survey-giveaway.md
            
          
    Blockchain Explorer Survey

5 MEW Engraved Ledger Nano S and Stickers Giveaway

Rules

Survey must be thoughtful
Valid
No spamming
Must  answer all questions, including open ended responses

Procedure


At the conclusion of the survey, we will publish a list of KECCAK-256 hashes of lowercased twitter handles or email addresses which are eligible (To somewhat hide user information)
We will pick a blocknumber atleast 1000+ blocks into the future, lets call this N
Then we will collect the Hashes of blockHash(N),blockHash(N+1),blockHash(N+2),blockHash(N+3),blockHash(N+4) (Total of 5 blockhashes, 5 is the number of Ledger Nano S)
Then use following formula to select the Winners,

NE number of entries

function randomGen(uint blockHash) constant returns (uint randomNumber) {
    return(blockHash % NE);
}


This will return the winning positions of the published list, list is 0 based. If it returns the same number twice, we will pick the next in line!