DAI => PDAI is taking long (e.g. 2 tx)

[TimDaub]

Scope

• Currently when sending funds to the bridge, we're first approving for the exact amount that we then want to deposit subsequently
• This makes exchanging DAI => PDAI a slow process
• Many dApps take advantage of approving uint(2^256)-1, such that after the first time they won't have to approve anymore

The Problem

To get PDAI, as a user I have to send DAI to the burner-wallet and then use "Exchange.js" to swap my DAI for PDAI. I'm annoyed that I have to "keep my phone unlocked" for the time of the two transactions waiting to be confirmed.

Personally, I see two solutions

Solution 1

• In an option that is by default enabled, allow the user to approve the biggest possible integer to the bridge such that two transactions can be avoided

Solution 2

• Instead of the "Receive" QR code being a regular address, deploy a smart contract for the user that automatically forwards DAI to the LeapDAO bridge. A so called "PDAI => DAI converter contract"

Solution 3

[Feel free to add more in the comments]

Deliverables

• Implement one of the above mentioned solutions or your own

Roles

bounty gardener: @TimDaub / 10%
bounty worker: name / 75%
bounty reviewer: name / 15%