Risk management

Risk management for minting and burning based upon reserve ratio:

Reserve ratio > 130%

1. allow minting of USD1

2. allow minting of USD91, USD971, and USD84

3. allow burning of USD91, USD971, and USD84 to USD1

4. allow burning of USD1 to USDT

100% < Reserve ratio ≤ 130%

1. pause USD1 minting from USDT temporarily

2. wait for reserve ratio to go above 130% to restart minting USD1 from USDT

3. allow minting of USD91, USD971, and USD84

4. allow burning of USD91, USD971, and USD84 to USD1

5. allow burning of USD1 to USDT

Reserve ratio ≤ 100%

1. trigger the global settlement process that stops minting USD91, USD971, USD84, and USD1 from USDT

2. allow burning of USD91, USD971, and USD84 to USD1

3. allow burning of USD1 to USDT