CSAccounting
CSAccounting.sol is a supplementary contract responsible for the management of bond, rewards, and penalties. It stores bond tokens as stETH shares, provides information about the bond required, and provides interfaces for the penalties. Node Operators claim rewards and top-up bonds using this contract.
Changes in v2:
- User-facing methods for reward claims and bond top-ups are moved to
CSAccounting.solfromCSModule.sol; - Public methods to get claimable bond amounts and rewards are added;
Upgradability
The contract uses OssifiableProxy for upgradability.
State Variables
PAUSE_ROLE
bytes32 public constant PAUSE_ROLE = keccak256("PAUSE_ROLE");
RESUME_ROLE
bytes32 public constant RESUME_ROLE = keccak256("RESUME_ROLE");
MANAGE_BOND_CURVES_ROLE
bytes32 public constant MANAGE_BOND_CURVES_ROLE = keccak256("MANAGE_BOND_CURVES_ROLE");
SET_BOND_CURVE_ROLE
bytes32 public constant SET_BOND_CURVE_ROLE = keccak256("SET_BOND_CURVE_ROLE");
RECOVERER_ROLE
bytes32 public constant RECOVERER_ROLE = keccak256("RECOVERER_ROLE");
MODULE
ICSModule public immutable MODULE;
FEE_DISTRIBUTOR
ICSFeeDistributor public immutable FEE_DISTRIBUTOR;
LIDO_LOCATOR
ILidoLocator public immutable LIDO_LOCATOR;
LIDO
ILido public immutable LIDO;
WITHDRAWAL_QUEUE
IWithdrawalQueue public immutable WITHDRAWAL_QUEUE;
WSTETH
IWstETH public immutable WSTETH;
MIN_CURVE_LENGTH
uint256 public constant MIN_CURVE_LENGTH = 1;
DEFAULT_BOND_CURVE_ID
uint256 public constant DEFAULT_BOND_CURVE_ID = 0;
MAX_CURVE_LENGTH
uint256 public constant MAX_CURVE_LENGTH = 100;
MIN_BOND_LOCK_PERIOD
uint256 public immutable MIN_BOND_LOCK_PERIOD;
MAX_BOND_LOCK_PERIOD
uint256 public immutable MAX_BOND_LOCK_PERIOD;
chargePenaltyRecipient
address public chargePenaltyRecipient;
Functions
resume
Resume reward claims and deposits
function resume() external onlyRole(RESUME_ROLE);
pauseFor
Pause reward claims and deposits for duration seconds
Must be called together with CSModule.pauseFor
function pauseFor(uint256 duration) external onlyRole(PAUSE_ROLE);
Parameters
| Name | Type | Description |
|---|---|---|
duration | uint256 | Duration of the pause in seconds |
setChargePenaltyRecipient
Set charge recipient address
function setChargePenaltyRecipient(address _chargePenaltyRecipient) external onlyRole(DEFAULT_ADMIN_ROLE);
Parameters
| Name | Type | Description |
|---|---|---|
_chargePenaltyRecipient | address | Charge recipient address |
setBondLockPeriod
Set bond lock period
function setBondLockPeriod(uint256 period) external onlyRole(DEFAULT_ADMIN_ROLE);
Parameters
| Name | Type | Description |
|---|---|---|
period | uint256 | Period in seconds to retain bond lock |
addBondCurve
Add a new bond curve
function addBondCurve(BondCurveIntervalInput[] calldata bondCurve)
external
onlyRole(MANAGE_BOND_CURVES_ROLE)
returns (uint256 id);
Parameters
| Name | Type | Description |
|---|---|---|
bondCurve | BondCurveIntervalInput[] | Bond curve definition to add |
Returns
| Name | Type | Description |
|---|---|---|
id | uint256 | Id of the added curve |
updateBondCurve
Update existing bond curve
If the curve is updated to a curve with higher values for any point, Extensive checks and actions should be performed by the method caller to avoid inconsistency in the keys accounting. A manual update of the depositable validators count in CSM might be required to ensure that the keys pointers are consistent.
function updateBondCurve(uint256 curveId, BondCurveIntervalInput[] calldata bondCurve)
external
onlyRole(MANAGE_BOND_CURVES_ROLE);
Parameters
| Name | Type | Description |
|---|---|---|
curveId | uint256 | Bond curve ID to update |
bondCurve | BondCurveIntervalInput[] | Bond curve definition |
setBondCurve
Set the bond curve for the given Node Operator
Updates depositable validators count in CSM to ensure key pointers consistency
function setBondCurve(uint256 nodeOperatorId, uint256 curveId) external onlyRole(SET_BOND_CURVE_ROLE);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
curveId | uint256 | ID of the bond curve to set |
depositETH
Stake user's ETH with Lido and deposit stETH to the bond
Called by CSM exclusively. CSM should check node operator existence and update depositable validators count
function depositETH(address from, uint256 nodeOperatorId) external payable whenResumed onlyModule;
Parameters
| Name | Type | Description |
|---|---|---|
from | address | Address to stake ETH and deposit stETH from |
nodeOperatorId | uint256 | ID of the Node Operator |
depositETH
Stake user's ETH with Lido and deposit stETH to the bond
Called by CSM exclusively. CSM should check node operator existence and update depositable validators count
function depositETH(uint256 nodeOperatorId) external payable whenResumed;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
depositStETH
Deposit user's stETH to the bond for the given Node Operator
Called by CSM exclusively. CSM should check node operator existence and update depositable validators count
function depositStETH(address from, uint256 nodeOperatorId, uint256 stETHAmount, PermitInput calldata permit)
external
whenResumed
onlyModule;
Parameters
| Name | Type | Description |
|---|---|---|
from | address | Address to deposit stETH from. |
nodeOperatorId | uint256 | ID of the Node Operator |
stETHAmount | uint256 | Amount of stETH to deposit |
permit | PermitInput | stETH permit for the contract |
depositStETH
Deposit user's stETH to the bond for the given Node Operator
Called by CSM exclusively. CSM should check node operator existence and update depositable validators count
function depositStETH(uint256 nodeOperatorId, uint256 stETHAmount, PermitInput calldata permit) external whenResumed;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
stETHAmount | uint256 | Amount of stETH to deposit |
permit | PermitInput | stETH permit for the contract |
depositWstETH
Unwrap the user's wstETH and deposit stETH to the bond for the given Node Operator
Called by CSM exclusively. CSM should check node operator existence and update depositable validators count
function depositWstETH(address from, uint256 nodeOperatorId, uint256 wstETHAmount, PermitInput calldata permit)
external
whenResumed
onlyModule;
Parameters
| Name | Type | Description |
|---|---|---|
from | address | Address to unwrap wstETH from |
nodeOperatorId | uint256 | ID of the Node Operator |
wstETHAmount | uint256 | Amount of wstETH to deposit |
permit | PermitInput | wstETH permit for the contract |
depositWstETH
Unwrap the user's wstETH and deposit stETH to the bond for the given Node Operator
Called by CSM exclusively. CSM should check node operator existence and update depositable validators count
function depositWstETH(uint256 nodeOperatorId, uint256 wstETHAmount, PermitInput calldata permit)
external
whenResumed;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
wstETHAmount | uint256 | Amount of wstETH to deposit |
permit | PermitInput | wstETH permit for the contract |
claimRewardsStETH
Claim full reward (fee + bond) in stETH for the given Node Operator with desirable value.
rewardsProof and cumulativeFeeShares might be empty in order to claim only excess bond
It's impossible to use single-leaf proof via this method, so this case should be treated carefully by off-chain tooling, e.g. to make sure a tree has at least 2 leafs.
function claimRewardsStETH(
uint256 nodeOperatorId,
uint256 stETHAmount,
uint256 cumulativeFeeShares,
bytes32[] calldata rewardsProof
) external whenResumed returns (uint256 claimedShares);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
stETHAmount | uint256 | Amount of stETH to claim |
cumulativeFeeShares | uint256 | Cumulative fee stETH shares for the Node Operator |
rewardsProof | bytes32[] | Merkle proof of the rewards |
Returns
| Name | Type | Description |
|---|---|---|
claimedShares | uint256 | shares Amount of stETH shares claimed |
claimRewardsWstETH
Claim full reward (fee + bond) in wstETH for the given Node Operator available for this moment.
rewardsProof and cumulativeFeeShares might be empty in order to claim only excess bond
It's impossible to use single-leaf proof via this method, so this case should be treated carefully by off-chain tooling, e.g. to make sure a tree has at least 2 leafs.
function claimRewardsWstETH(
uint256 nodeOperatorId,
uint256 wstETHAmount,
uint256 cumulativeFeeShares,
bytes32[] calldata rewardsProof
) external whenResumed returns (uint256 claimedWstETH);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
wstETHAmount | uint256 | Amount of wstETH to claim |
cumulativeFeeShares | uint256 | Cumulative fee stETH shares for the Node Operator |
rewardsProof | bytes32[] | Merkle proof of the rewards |
Returns
| Name | Type | Description |
|---|---|---|
claimedWstETH | uint256 | claimedWstETHAmount Amount of wstETH claimed |
claimRewardsUnstETH
Request full reward (fee + bond) in Withdrawal NFT (unstETH) for the given Node Operator available for this moment.
rewardsProof and cumulativeFeeShares might be empty in order to claim only excess bond
Reverts if amount isn't between MIN_STETH_WITHDRAWAL_AMOUNT and MAX_STETH_WITHDRAWAL_AMOUNT
function claimRewardsUnstETH(
uint256 nodeOperatorId,
uint256 stETHAmount,
uint256 cumulativeFeeShares,
bytes32[] calldata rewardsProof
) external whenResumed returns (uint256 requestId);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
stETHAmount | uint256 | Amount of ETH to request |
cumulativeFeeShares | uint256 | Cumulative fee stETH shares for the Node Operator |
rewardsProof | bytes32[] | Merkle proof of the rewards |
Returns
| Name | Type | Description |
|---|---|---|
requestId | uint256 | Withdrawal NFT ID |
lockBondETH
Lock bond in ETH for the given Node Operator
Called by CSM exclusively
function lockBondETH(uint256 nodeOperatorId, uint256 amount) external onlyModule;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
amount | uint256 | Amount to lock in ETH (stETH) |
releaseLockedBondETH
Release locked bond in ETH for the given Node Operator
Called by CSM exclusively
function releaseLockedBondETH(uint256 nodeOperatorId, uint256 amount) external onlyModule;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
amount | uint256 | Amount to release in ETH (stETH) |
compensateLockedBondETH
Compensate locked bond ETH for the given Node Operator
Called by CSM exclusively
function compensateLockedBondETH(uint256 nodeOperatorId) external payable onlyModule;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
settleLockedBondETH
Settle locked bond ETH for the given Node Operator
Called by CSM exclusively
function settleLockedBondETH(uint256 nodeOperatorId) external onlyModule returns (bool applied);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
penalize
Penalize bond by burning stETH shares of the given Node Operator
Penalty application has a priority over the locked bond. Method call can result in the remaining bond being lower than the locked bond.
function penalize(uint256 nodeOperatorId, uint256 amount) external onlyModule;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
amount | uint256 | Amount to penalize in ETH (stETH) |
chargeFee
Charge fee from bond by transferring stETH shares of the given Node Operator to the charge recipient
Charge confiscation has a priority over the locked bond. Method call can result in the remaining bond being lower than the locked bond.
function chargeFee(uint256 nodeOperatorId, uint256 amount) external onlyModule;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
amount | uint256 | Amount to charge in ETH (stETH) |
pullFeeRewards
Pull fees from CSFeeDistributor to the Node Operator's bond
Permissionless method. Can be called before penalty application to ensure that rewards are also penalized
function pullFeeRewards(uint256 nodeOperatorId, uint256 cumulativeFeeShares, bytes32[] calldata rewardsProof)
external;
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
cumulativeFeeShares | uint256 | Cumulative fee stETH shares for the Node Operator |
rewardsProof | bytes32[] | Merkle proof of the rewards |
recoverERC20
Allows sender to recover ERC20 tokens held by the contract
function recoverERC20(address token, uint256 amount) external override;
Parameters
| Name | Type | Description |
|---|---|---|
token | address | The address of the ERC20 token to recover |
amount | uint256 | The amount of the ERC20 token to recover Emits an ERC20Recovered event upon success Optionally, the inheriting contract can override this function to add additional restrictions |
recoverStETHShares
Recover all stETH shares from the contract
Accounts for the bond funds stored during recovery
function recoverStETHShares() external;
renewBurnerAllowance
Service method to update allowance to Burner in case it has changed
function renewBurnerAllowance() external;
getInitializedVersion
Get the initialized version of the contract
function getInitializedVersion() external view returns (uint64);
totalBondShares
Get total bond shares (stETH) stored on the contract
function totalBondShares() public view returns (uint256);
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Total bond shares (stETH) |
getBondShares
Get bond shares (stETH) for the given Node Operator
function getBondShares(uint256 nodeOperatorId) public view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Bond in stETH shares |
getBond
Get bond amount in ETH (stETH) for the given Node Operator
function getBond(uint256 nodeOperatorId) public view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Bond amount in ETH (stETH) |
getCurvesCount
function getCurvesCount() external view returns (uint256);
getCurveInfo
Return bond curve for the given curve id
Reverts if curveId is invalid
function getCurveInfo(uint256 curveId) external view returns (BondCurve memory);
Parameters
| Name | Type | Description |
|---|---|---|
curveId | uint256 | Curve id to get bond curve for |
Returns
| Name | Type | Description |
|---|---|---|
<none> | BondCurve | Bond curve |
getBondCurve
Get bond curve for the given Node Operator
function getBondCurve(uint256 nodeOperatorId) external view returns (BondCurve memory);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | BondCurve | Bond curve |
getBondCurveId
Get bond curve ID for the given Node Operator
function getBondCurveId(uint256 nodeOperatorId) public view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Bond curve ID |
getBondAmountByKeysCount
Get required bond in ETH for the given number of keys for default bond curve
To calculate the amount for the new keys 2 calls are required: getBondAmountByKeysCount(newTotal) - getBondAmountByKeysCount(currentTotal)
function getBondAmountByKeysCount(uint256 keys, uint256 curveId) public view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
keys | uint256 | Number of keys to get required bond for |
curveId | uint256 | Id of the curve to perform calculations against |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Amount for particular keys count |
getKeysCountByBondAmount
Get keys count for the given bond amount with default bond curve
function getKeysCountByBondAmount(uint256 amount, uint256 curveId) public view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
amount | uint256 | Bond amount in ETH (stETH)to get keys count for |
curveId | uint256 | Id of the curve to perform calculations against |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Keys count |
getBondLockPeriod
Get default bond lock period
function getBondLockPeriod() external view returns (uint256);
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | period Default bond lock period |
getLockedBondInfo
Get information about the locked bond for the given Node Operator
function getLockedBondInfo(uint256 nodeOperatorId) external view returns (BondLock memory);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | BondLock | Locked bond info |
getActualLockedBond
Get amount of the locked bond in ETH (stETH) by the given Node Operator
function getActualLockedBond(uint256 nodeOperatorId) public view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Amount of the actual locked bond |
getBondSummary
Get current and required bond amounts in ETH (stETH) for the given Node Operator
To calculate excess bond amount subtract required from current value.
To calculate missed bond amount subtract current from required value
function getBondSummary(uint256 nodeOperatorId) external view returns (uint256 current, uint256 required);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
current | uint256 | Current bond amount in ETH |
required | uint256 | Required bond amount in ETH |
getUnbondedKeysCount
Get the number of the unbonded keys
function getUnbondedKeysCount(uint256 nodeOperatorId) external view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Unbonded keys count |
getUnbondedKeysCountToEject
Get the number of the unbonded keys to be ejected using a forcedTargetLimit
Locked bond is not considered for this calculation to allow Node Operators to
compensate the locked bond via compensateLockedBondETH method before the ejection happens
function getUnbondedKeysCountToEject(uint256 nodeOperatorId) external view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Unbonded keys count |
getBondAmountByKeysCountWstETH
Get the bond amount in wstETH required for the keysCount keys using the default bond curve
function getBondAmountByKeysCountWstETH(uint256 keysCount, uint256 curveId) external view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
keysCount | uint256 | Keys count to calculate the required bond amount |
curveId | uint256 | Id of the curve to perform calculations against |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | wstETH amount required for the keysCount |
getRequiredBondForNextKeysWstETH
Get the required bond in wstETH (inc. missed and excess) for the given Node Operator to upload new keys
function getRequiredBondForNextKeysWstETH(uint256 nodeOperatorId, uint256 additionalKeys)
external
view
returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
additionalKeys | uint256 | Number of new keys to add |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Required bond in wstETH |
getClaimableBondShares
Get current claimable bond in stETH shares for the given Node Operator
function getClaimableBondShares(uint256 nodeOperatorId) external view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Current claimable bond in stETH shares |
getClaimableRewardsAndBondShares
Get current claimable bond in stETH shares for the given Node Operator Includes potential rewards distributed by the Fee Distributor
function getClaimableRewardsAndBondShares(
uint256 nodeOperatorId,
uint256 cumulativeFeeShares,
bytes32[] calldata rewardsProof
) external view returns (uint256 claimableShares);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
cumulativeFeeShares | uint256 | Cumulative fee stETH shares for the Node Operator |
rewardsProof | bytes32[] | Merkle proof of the rewards |
Returns
| Name | Type | Description |
|---|---|---|
claimableShares | uint256 | Current claimable bond in stETH shares |
feeDistributor
function feeDistributor() external view returns (ICSFeeDistributor);
getBondSummaryShares
Get current and required bond amounts in stETH shares for the given Node Operator
To calculate excess bond amount subtract required from current value.
To calculate missed bond amount subtract current from required value
function getBondSummaryShares(uint256 nodeOperatorId) public view returns (uint256 current, uint256 required);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
Returns
| Name | Type | Description |
|---|---|---|
current | uint256 | Current bond amount in stETH shares |
required | uint256 | Required bond amount in stETH shares |
getRequiredBondForNextKeys
Get the required bond in ETH (inc. missed and excess) for the given Node Operator to upload new deposit data
function getRequiredBondForNextKeys(uint256 nodeOperatorId, uint256 additionalKeys) public view returns (uint256);
Parameters
| Name | Type | Description |
|---|---|---|
nodeOperatorId | uint256 | ID of the Node Operator |
additionalKeys | uint256 | Number of new keys to add |
Returns
| Name | Type | Description |
|---|---|---|
<none> | uint256 | Required bond amount in ETH |
Events
BondLockCompensated
event BondLockCompensated(uint256 indexed nodeOperatorId, uint256 amount);
ChargePenaltyRecipientSet
event ChargePenaltyRecipientSet(address chargePenaltyRecipient);
BondDepositedETH
event BondDepositedETH(uint256 indexed nodeOperatorId, address from, uint256 amount);
BondDepositedStETH
event BondDepositedStETH(uint256 indexed nodeOperatorId, address from, uint256 amount);
BondDepositedWstETH
event BondDepositedWstETH(uint256 indexed nodeOperatorId, address from, uint256 amount);
BondClaimedUnstETH
event BondClaimedUnstETH(uint256 indexed nodeOperatorId, address to, uint256 amount, uint256 requestId);
BondClaimedStETH
event BondClaimedStETH(uint256 indexed nodeOperatorId, address to, uint256 amount);
BondClaimedWstETH
event BondClaimedWstETH(uint256 indexed nodeOperatorId, address to, uint256 amount);
BondBurned
event BondBurned(uint256 indexed nodeOperatorId, uint256 amountToBurn, uint256 burnedAmount);
BondCharged
event BondCharged(uint256 indexed nodeOperatorId, uint256 toChargeAmount, uint256 chargedAmount);
BondCurveAdded
event BondCurveAdded(uint256 indexed curveId, BondCurveIntervalInput[] bondCurveIntervals);
BondCurveUpdated
event BondCurveUpdated(uint256 indexed curveId, BondCurveIntervalInput[] bondCurveIntervals);
BondCurveSet
event BondCurveSet(uint256 indexed nodeOperatorId, uint256 curveId);
BondLockChanged
event BondLockChanged(uint256 indexed nodeOperatorId, uint256 newAmount, uint256 until);
BondLockRemoved
event BondLockRemoved(uint256 indexed nodeOperatorId);
BondLockPeriodChanged
event BondLockPeriodChanged(uint256 period);