Official documentation for effect of Forked Certificates?

[Doki]

The ones that bid the most ciphers get preference down to people that only bid a single cipher, then after that people that did not bid a cipher at all are randomly selected. So:

Dude that bid 10 cipher auto-top spot, guaranteed entry
Dude that bid 3 ciphers (next highest) , guaranteed entry
14 people that bid 1 cipher guaranteed entry
33 people that did not bid a cipher: 32 are randomly selected , 1 person doesn't get to enter.

If it was just 50 people bid 1 cipher, the game would randomly select from them 48 people and 2 people would get cipher refunds.

[Gurgeh]

The ones that bid the most ciphers get preference down to people that only bid a single cipher, then after that people that did not bid a cipher at all are randomly selected. So:

Dude that bid 10 cipher auto-top spot, guaranteed entry
Dude that bid 3 ciphers (next highest) , guaranteed entry
14 people that bid 1 cipher guaranteed entry
33 people that did not bid a cipher: 32 are randomly selected , 1 person doesn't get to enter.

If it was just 50 people bid 1 cipher, the game would randomly select from them 48 people and 2 people would get cipher refunds.

What are the maximum number of ciphers you can bid?
Is 10 the maximum?

If not, are we saying that someone who bids 10 ciphers will get just as much chance as someone who bids 20?
And if so, how do we know that? What's the source?