Simple tool to give more transparency and credibility to bitcoin giveaways
Giveaways can be now have their results easily verified.
It is also possible to save and share the results in a unique URL.
As the blockhash is just a number, its last 6 digits is converted to decimal using this function:
var decimal = parseInt(blockhash.slice(-6), 16);
Now we have an integer (0 to 16777215) from the blockhash.
After dividing this decimal by the number of participants, we use the modulo operator (%) to get the division remainder becomes the index_number.
This index_number is applied in the participants list, to get the position of the winner.
var index_number = decimal % competitors.length; var winner = competitors[index_number];
For additional winners, the past winners are removed from the list and one more digit is added from the blockhash. A maximum 30 was added to avoid working with big numbers.
If you find this useful , please refer this tool in upcoming giveaways