POS Controller

Generate token interest like Proof-of-Stake system.

1. Modified MiniMeToken

• BalanceUpdatableMiniMeToken assumes token controller may update token balance inside onTransfer function of token controller.
  • POSController cannot use Giveth's MiniMeToken becuase it doesn't make token controller to generate or destroy tokens in onTransfer function.
  • We use BalanceUpdatableMiniMeToken for POSMiniMeToken

2. POSController

• POSController generates pos-style interests for POSMintableToken and POSMiniMeToken.

• POSController provides claimTokens() function to claim pos-style interests.

  • Also tokens are claimed when token transfer() or approve() is executed.
  • Above 2 functions invoke onTransfer(), onApprove() of POSController.
    • Becuase plain MintableToken cannot call function of owner, we need to add the functionality.
    • Inherits POSMintableTokenAPI

3. POSTokenAPI

• TokenControllerBridge provides MiniMeToken's onTransfer, onApprove, proxyPayment functionality for MintableToken.

• POSMintableTokenAPI provides POSController-compatibility for MintableToken.

• POSMiniMeTokenAPI provides POSController-compatibility for BalanceUpdatableMiniMeToken.

4. POSMintableToken

• POSMintableToken inherits MintableToken and POSMintableTokenAPI.
  • Cheaper gas fee than POSMiniMeToken

5. POSMiniMeToken

• POSMiniMeToken inherits BalanceUpdatableMiniMeToken and POSMintableTokenAPI.
  • Can clone other MiniMeToken as a parent token