Abnormal Token Mint Detector Trap

Drosera trap for detecting unexpected token minting by watching totalSupply() and triggering only when supply rises above a configurable percentage within a bounded block window.

Detection rule

• Monitor one token’s totalSupply()
• Compare newest sample vs oldest sample in the current window
• Trigger when:
  • newSupply > oldSupply
  • blockWindow <= N
  • (newSupply - oldSupply) / oldSupply > X%

Default config in this example:

• X = 5% (thresholdBps = 500)
• N = 10 blocks
• token = USDC mainnet address (replace for production)

Response behavior

The paired response contract implements:

function freezeAndAlert(MintAlert[] calldata alerts) external;

When called by TrapConfig, it:

• marks token as frozen (tokenFrozen[token] = true)
• emits TokenFrozen
• emits GovernanceAlertTriggered

Files

• src/AbnormalTokenMintTrap.sol
• src/AbnormalTokenMintResponse.sol
• test/AbnormalTokenMintTrap.t.sol
• drosera.toml

Test

bun install
forge test

Caveat

Legitimate emissions (e.g. staking rewards, bridge minting, rebasing) can look suspicious, so tune threshold and sample window per token.