Who controls the 21M limit ?

[BitCoinDream]

Is it written in the mining clients ?

[wachtwoord]

EVERYONE!

Everyone that runs a full node

[BitCoinDream]

It must be written in some code that wont accept creation of BTC beyond 21M. May I know, where is it exactly ?

[wachtwoord]

If you run a full node (so for example the official Bitcoin client) you won't accept blocks which don't keep to the rules. If after 21M coins another block is mined with a block rewards (or if EVER a block is mined with an incorrect block award) the block is rejected by your client. If everyone rejects the block except the miner it won't be considered true

[BitCoinDream]

so it is written in the source code of bitcoin-0.8.6-win32-setup.exe ...right ?

[RodeoX]

so it is written in the source code of bitcoin-0.8.6-win32-setup.exe ...right ?

Even into the protocol itself. Other non-official clients must obey the rule also.  

One of the most powerful things about bitcoin is that it is open source. That means anyone can read the source and confirm how it functions. Most software is proprietary and you must trust the programmer to have not put anything malicious into the code. Whereas open source software has nothing to hide and trust is not required.

[udet4food]

so it is written in the source code of bitcoin-0.8.6-win32-setup.exe ...right ?

Even into the protocol itself. Other non-official clients must obey the rule also. 

This, and if they dont, they will just fork Bitcoin and live with their rules

[crowsFEET]

The bitcoin community essentially controls the 21 M limit.  Most would not support a fork that changes the limit.

[hieroglyph]

The world.  Haha, I always enjoy saying that.  My understanding is that the program or what have you of bitcoin calculates the total and mathematically works all the transactions based from the maximum amount of coins that can be mined and in circulation.

[Ntoeta]

Everyone that is running a full node.

[binaryclock]

Lol running full nodes is actually good .

[nate008]

The world.  Haha, I always enjoy saying that.  My understanding is that the program or what have you of bitcoin calculates the total and mathematically works all the transactions based from the maximum amount of coins that can be mined and in circulation.

I can't really get it , how do you say for your "understanding" , because when I read what you said there it makes no sense.