If you want some trade off I would suggest the third option C:
C. 1 bad flip = 20% of overall reward unpaid instead of 1 flip reward unpaid like in option B. 20% means 1 flips out of 5 is bad. 40% means 2 out of 5 are bad, etc.
That's the one and only right solution. I agree.
If you cannot access telegram link to download , then there is now way you can run Idena something is not right here,there's a possibility that the invite code will be wasted you must first prove that you have installed Idena and that is synced before you can get an invite code, that is one of the qualification.
Already send him invitation but I'll give it to someone else if he won't activate it 3 days before validation.
@brendan6498011 hope you are ok with that?
edit:
We now have first Idena signatures for Bitcointalk forum
(thanks to Navi)
Anyone can apply to wear them,
starting from Jr.Member to Legendary.
Just REPLY to this message with your RANK, and you will get yours.

Thank you!
Looks great!