mMITOs

Safe Staking Vault with 1:1 Exchange Rate

Staking Vault that accepts tMITO and issues mMITOs tokens 1:1.

Basic Info

Field	Value
Standard	ERC20 (not ERC4626)
Underlying Asset	tMITO
Token	mMITOs
Exchange Rate	Fixed 1:1
Withdrawal Wait	7 days
Slashing Exposure	None (principal safe)

Mechanism

Difference from mMITOc

	mMITOc	mMITOs
Standard	ERC4626	ERC20
Exchange Rate	Variable	Fixed 1:1
Slashing	Principal loss	Principal safe
Underlying Asset	WMITO	tMITO

Staking

function stake(address validator, uint256 amount) external

User specifies validator and tMITO amount
Vault delegates tMITO to TMITO_STAKING
Mints equal amount of mMITOs to user

stake(validatorA, 100 tMITO)
→ validatorStake[validatorA] += 100
→ totalStaked += 100
→ mint(user, 100 mMITOs)

Reward Distribution

Reward flow:

ValidatorStaking → ValidatorRewardDistributor → gmMITO Vault → gmMITO to user

Users call gmMITO.userMint(validators[], recipient) to claim rewards.

mMITOs Vault also has internal reward tracking structure:

struct RewardState {
  uint256 rewardPerShareStored;
  mapping(address => uint256) userRewardPerSharePaid;
  mapping(address => uint256) rewards;
}

Reward calculation:

earned = balanceOf(user) × (rewardPerShareStored - userRewardPerSharePaid[user])

Unstaking (requestUnstake)

function requestUnstake(address validator, uint256 amount) external

User specifies validator and amount
mMITOs burned
WithdrawalNFT minted
Unstaking requested to TMITO_STAKING

Claim Withdrawals

function claimWithdrawals(uint256[] tokenIds, address validator) external

Verify 7 days passed
Burn WithdrawalNFT
Transfer tMITO to user

State Variables

struct Storage {
  uint32 withdrawalPeriod;
  uint16 maxClaimsPerTx;
  StakingState stakingState;
  RewardState rewardState;
}
 
struct StakingState {
  uint256 totalStaked;  // Total staked tMITO
  mapping(address validator => uint256) validatorStake;  // Stake per validator
}

Validator Selection

Users choose validators when staking:

Check each validator's commission rate and uptime
Validator performance affects rewards (principal unaffected)

Integrated Contracts

Contract	Purpose
`TMITO`	Underlying asset (tMITO)
`WMITO`	Used for reward claims
`GM_MITO`	Reward token (gmMITO)
`VALIDATOR_MANAGER`	Validator list
`TMITO_STAKING`	Actual staking execution
`REWARD_DISTRIBUTOR`	Reward distribution
`WITHDRAWAL_NFT`	Withdrawal NFT