Staking Manager
To ensure Proof of Security consensus, Shibarium executes all proof verification and staking operations on the Ethereum smart contract, leaving the computation-heavy tasks to L2.
Stakeholders can take on the role of a validator, delegate, or watcher for reporting fraud. StakeManager is the primary contract for validator-related activities such as stake management, reward distribution, and signature verification. Only one role, either validator or delegator, can be assigned to a single Ethereum address as a design choice.
Using NFT ID as the source of ownership ensures that changes in ownership and signer will not impact the system.
validatorThreshold
: Shows the maximum number of validators accepted by the system, also called slots.- For various accounting done on heimdall for validators and delegator account root is submitted while submitting the
checkpoint
. - accRoot is used while
claimRewards
andunStakeClaim
.
function stake( uint256 amount, uint256 heimdallFee, bool acceptDelegation, bytes calldata signerPubkey) public;function stakeFor( address user, uint256 amount, uint256 heimdallFee, bool acceptDelegation, bytes memory signerPubkey) public;
- Allows anyone with amount (in BONE tokens) greater
minDeposit
then ifcurrentValidatorSetSize
is less thenvalidatorThreshold
. - MUST transfer
amount+heimdallFee
, puts validator into auction period for an auctionInterval.(more on auction in auction section) updateTimeLine
updates special timeline data structure, which keeps track of active validators and active stake for given epoch/checkpoint count.- One unique
NFT
is minted on each new stake/stakeFor call, which can be transferred to anyone but can be owned 1:1 ethereum address. acceptDelegation
set true if validators want to accept delegation,ValidatorShare
contract is deployed for the validator.
- 1.If a validator decides to unstake, they will be removed from the validator set in the next epoch. However, this removal is only applicable for the current checkpoint.
- 2.To account for a validator's exit, their stake will be removed from the timeline data structure, and the count for their exit epoch will be updated.
- 3.If a validator had a delegation, they should collect all rewards before their exit, and their delegation contract should be locked to prevent new delegations.
function unstakeClaim(uint256 validatorId) public;
- After
unstaking
validators are put into withdrawal period so that they can be slashed if any fraud found afterunstaking
for pas frauds. - Once
WITHDRAWAL_DELAY
period is served validator's can call this function and do settlement with stakeManager(get rewards if any, get staked tokens back, burn NFT etc)
function restake(uint256 validatorId, uint256 amount, bool stakeRewards) public;
- Allows validators to increase their stake by putting new amount or rewards or both.
- MUST update timeline(amount) for active stake.
function withdrawRewards(uint256 validatorId) public;
- Allows validators to withdraw accumulated rewards, must consider getting rewards from delegation contract if validator accepts delegation.
function updateSigner(uint256 validatorId, bytes memory signerPubkey) public
- Allows validators to update signer address(which is used to validate blocks on shibarium chain and checkpoint sigs on stakeManager)
function topUpForFee(uint256 validatorId, uint256 heimdallFee) public
- Validators can top-up their balance for heimdall fee.
function claimFee( uint256 validatorId, uint256 accumSlashedAmount, uint256 accumFeeAmount, uint256 index, bytes memory proof ) public
- Used to withdraw fee from heimdall.
accountStateRoot
is updated on each checkpoint, so that validators can provide proof of inclusion in this root for account on heimdall and withdraw fee.- Note that
accountStateRoot
is re-written to prevent exits on multiple checkpoints(for old root and save accounting on stakeManager) accumSlashedAmount
is unused atm, will be used for slashing on heimdall if needed.
- Standard erc721 with few restrictions like one token per user and minted in sequential manner.
- In order to replace poor performing validator there is periodic auction for each validator slot.
- For individual validators there is auction window where wanna be validators can bid their amount and start an auction using
startAuction
function. - Once the
auctionInterval
is over last bidder needs to close the auction in order to confirm and become validator. For which she needs to callconfirmAuctionBid
which accepts and behave similar to newstake
function for upcoming validator andunStake
for old validator. - Current validator can bid for herself and try to keep that place.
- Whole mech dynamically balances the stake value and overall security according to market conditions and use of shibarium chain.
function startAuction( uint256 validatorId, /** auction for validator */ uint256 amount /** amount greater then old validator's stake */ ) external;
- In order to start a bid or bid higher on already running auction this function is used.
- Auction period runs in cycles like
(auctionPeriod--dynasty)--(auctionPeriod--dynasty)--(auctionPeriod--dynasty)
so it MUST check for correct auction period. perceivedStakeFactor
is used to calculate exact factor*old stake (note currently it is by default 1 WIP for picking the function).- MUST check for auction from last auction period if any still going on (one can choose to not call
confirmAuction
in order to get her capital out in next auction). - Normally continuous english auction is going on in a
auctionPeriod
.function confirmAuctionBid( uint256 validatorId, uint256 heimdallFee, /** for new validator */ bool acceptDelegation, bytes calldata signerPubkey ) external
- MUST check that this is not an auctionPeriod.
- If last bidder is owner of
validatorId
behaviour should be similar to restake. - In second case unStake
validatorId
and add new user as validator from next checkpoint, for the new user behaviour should be similar to stake/stakeFor.
function checkSignatures( uint256 blockInterval, bytes32 voteHash, bytes32 stateRoot, bytes memory sigs ) public
- Writes are meant only for RootChain contract when submitting checkpoints
voteHash
on which all validators sign (BFT ⅔+1 agreement)- This function validates only unique sigs and checks for ⅔+1 power has signed on checkpoint root (inclusion in
voteHash
verification in RootChain contract for all data)currentValidatorSetTotalStake
provides current active stake. - Rewards are distributed proportional to validator's stake.
- Checks if given validator is active validator for current epoch.
1struct State { int256 amount; int256 stakerCount; }mapping(uint256 => State) public validatorState;
Centralised logging contract for both validator and delegation events, Includes few read only functions.
Factory contract to deploy
ValidatorShare
contract for each validator who opt-in for delegation.NOTE:
jail
, unJail
and slash
function aren't used currently (part of slashing implementation).
Some of the information found on this page has been developed using the open-source information provided by Polygon.
Last modified 2mo ago