user1491: Imagine I want to change the formula of transactions between a group of people who want to use this money in this way: 
 "Everyone will have a maximun quantity of money to waste in the month, and whoever received an amount from other would waste that amount over the maximum."
That is a credit that avoid Bitcoin could be seen like something material. So I am asking about a Bitcredit. If it is possible in your implementation and what could be the cost of use.
The project I have is more or less more specific that a simple phrase, so I could give more explanations. But the concept itself is so easy like I exposed.
So the question is: is it possible with bitcoins? What could be the cost?

user85: Bitcoin would be a poor choice for such a system because it doesn't really have a concept of account balances that are present in the blocks. You'll likely also need some central authority to decide who is part of "everyone". Otherwise, someone can create a million accounts and then pool all the money.
Also, Bitcoin is fundamentally secured against double spends by mining, and that makes it a poor choice for any currency that can't pay sizable enough rewards to produce real security.
You'd probably find it much easier using some scheme based around accounts with balances rather than unspent transaction outputs.

1491: <p>Imagine I want to change the formula of transactions between a group of people who want to use this money in this way: 
 <strong>"Everyone will have a maximun quantity of money to waste in the month, and whoever received an amount from other would waste that amount over the maximum."</strong></p>

<p>That is a credit that avoid Bitcoin could be seen like something material. So I am asking about a Bitcredit. If it is possible in your implementation and what could be the cost of use.</p>

<p>The project I have is more or less more specific that a simple phrase, so I could give more explanations. But the concept itself is so easy like I exposed.</p>

<p>So the question is: <strong>is it possible with bitcoins? What could be the cost?</strong></p>
 85: <p>Bitcoin would be a poor choice for such a system because it doesn't really have a concept of account balances that are present in the blocks. You'll likely also need some central authority to decide who is part of "everyone". Otherwise, someone can create a million accounts and then pool all the money.</p>

<p>Also, Bitcoin is fundamentally secured against double spends by mining, and that makes it a poor choice for any currency that can't pay sizable enough rewards to produce real security.</p>

<p>You'd probably find it much easier using some scheme based around accounts with balances rather than unspent transaction outputs.</p>
