└── README.md


/README.md:
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 1 | 
 2 | `allow(uint256 amount)` - allocate `amount` tokens from the caller to the transaction
 3 | `spend(uint256 amount)` - move `amount` tokens from the transaction to the caller
 4 | 
 5 | This document describes a token pattern which is currently not possible to implement in full, but has a lot of interesting and useful properties.
 6 | The most straightforward way to implement it would be using a `TXID` opcode.
 7 | 
 8 | The basic idea is that instead of pushing and pulling tokens to each other, contracts transiently push and pull tokens *into the transaction*.
 9 | You can think of these as flash loan without an external contract calls.
10 | 
11 | The trick is to keep track of the implied refund on a per-allower basis. Next time the balance is accessed, process the refund first.


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