Staking

Abstract

The staking precompiled contract acts as a bridge to enable the Stable SDK’s x/staking module functionality to be used in an EVM environment.

Contents

1. Concepts
2. Configuration
3. Methods
4. Events

Concepts

In x/staking module in Stable SDK, bond denom must be registered during chain initialization for staking. Validator and delegator only can use bond denom staking token. In staking precompiled contract, additional checks are made to ensure that the validator or delegator is a caller.

Configuration

Contract address and gas cost is predefined.

Contract Address

Methods

createValidator

A validator is created. The validator must be created with an initial delegation from the operator. For potential delegators, validator should offer their information and plan for commission rate. Delegator can choose validator to delegate their own tokens by disclosed information with natural regulation from market mechanism.

CreateValidator is emitted when the validator is successfully registered.

Inputs

Name	Type	Description
description	Description	information of the validator
commissionRates	CommissionRates	commission rate of the staking token rewarded by the validator
minSelfDelegation	uint256	the minimum self-delegation amount of the validator
validatorAddress	address	the address of the validator
pubkey	string	the public key of the validator
value	uint256	the amount of the staking token initially self-delegated to the validator

Description is a struct with the following fields:

Name	Type	Description
moniker	string	name of the validator
identity	string	the identity of the validator
website	string	the url of the validator’s website
securityContact	string	security contract information
details	string	additional description of the validator

CommissionRates is a struct with the following fields:

Name	Type	Description
rate	uint256	current commission rate that the validator receives
maxRate	uint256	the maximum commission rate (cannot be set higher than this)
maxChangeRate	uint256	the maximium commission rate that validator can change for a day

rate should be set to an appropriate value acceptable to the market.

• If validator’s commission rate is higher, delegator’s profit is lower.
• If validator’s commission rate is lower, validator’s profit is lower and it makes operation difficult.

Since high maxRate can make delegator concern about unexpected high commission rate by validator, maxRate should be set carefully. maxChangeRate is unchangeable when initialized.

Outputs

Name	Type	Description
success	bool	true if the validator is successfully registered

editValidator

Validator updates its information. Validator only can update information except unchangeable fields such as maxRate and maxChangeRate in CommissionRates struct.

EditValidator is emitted when the validator is successfully updated.

Inputs

Name	Type	Description
description	Description	information of the validator
validatorAddress	address	the address of the validator
commissionRate	int256	the commission rate of the staking token rewarded by the validator
minSelfDelegation	int256	the minimum self-delegation amount of the validator

Outputs

Name	Type	Description
success	bool	true if the validator is successfully updated

delegate

Delegator sets the amount of token to be delegated to the validator.

Delegate is emitted when the delegation is successfully done.

Inputs

Name	Type	Description
delegatorAddress	address	the address of the delegator
validatorAddress	address	the address of the validator
amount	uint256	the amount of the staking token delegated to the validator

Outputs

Name	Type	Description
success	bool	true if the delegation is successfully done

Events

newShares indicates the ownership ratio of the delegator. The shares calculated may vary depending on the time even though the same amount of tokens are delegated.

undelegate

Delegator withdraws the amount of token delegated to the validator.

Unbond is emitted when the undelegation is successfully done.

Inputs

Name	Type	Description
delegatorAddress	address	the address of the delegator
validatorAddress	address	the address of the validator
amount	uint256	the amount of the staking token willing to undelegate from the validator

Outputs

Name	Type	Description
success	bool	true if the undelegation is successfully done

redelegate

Delegator redelegates the amount of token delegated to the validator to another validator.

Redelegate is emitted when the redelegate is successfully done.

Inputs

Name	Type	Description
delegatorAddress	address	the address of the delegator
validatorSrc	string	the address of the source validator
validatorDst	string	the address of the destination validator
amount	uint256	the amount of the staking token for redelegation

Outputs

Name	Type	Description
success	bool	true if the redelegate is successfully done

delegation

Returns the delegation information between a delegator and a validator. If there is no delegation found, the shares and balance will be 0.

Inputs

Name	Type	Description
delegatorAddress	address	the address of the delegator
validatorAddress	address	the address of the validator

Outputs

Name	Type	Description
shares	uint256	the delegated shares
balance	Coin	the amount of delegated token and denom

Coin is a struct with the following fields:

Name	Type	Description
denom	string	the denom of the reward
amount	uint256	the amount of the reward

unbondingDelegation

Returns the unbonding delegation information between a delegator and a validator. If there is no unbonding delegation found, empty UnbondingDelegationOutput will be returned.

Inputs

Name	Type	Description
delegatorAddress	address	the address of the delegator
validatorAddress	address	the address of the validator

Outputs

Name	Type	Description
unbondingDelegation	UnbondingDelegationOutput	the information of the unbonding delegation

UnbondingDelegationOutput is a struct with the following fields:

Name	Type	Description
validatorAddress	address	the address of the validator
delegatorAddress	address	the address of the delegator
entries	UnbondingDelegationEntry[]	the entries of the unbonding delegation

UnbondingDelegationEntry is a struct with the following fields:

Name	Type	Description
creationHeight	uint64	the creation height of the entry
completionTime	uint64	the completion time of the entry
initialBalance	Coin	the initial balance of the entry
balance	Coin	the balance of the entry

validator

Returns the validator information. If there is no validator found, empty ValidatorOutput will be returned.

Inputs

Name	Type	Description
validatorAddress	address	the address of the validator

Outputs

Name	Type	Description
validator	Validator	the information of the validator

Validator is a struct with the following fields:

Name	Type	Description
operatorAddress	address	the address of the validator
consensusPubkey	string	the public key of the validator
jailed	bool	whether the validator is jailed or not
status	int32	the status of the validator
tokens	uint256	the amount of the staking token delegated to the validator
delegatorShares	uint256	the amount of the delegation shares
description	string	the description of the validator
unbondingHeight	int64	the height at which the validator is unbonding
unbondingTime	int64	the time at which the validator is unbonding
commission	uint256	the commission rate of the staking token rewarded by the validator
minSelfDelegation	uint256	the minimum self-delegation amount of the validator

validators

Returns all validators matched with the status. If there is no validator found, empty ValidatorsOutput will be returned.

Status, declared in x/staking module, can be one of the following:

• 0 : “BOND_STATUS_UNSPECIFIED”, unspecified status
• 1 : “BOND_STATUS_UNBONDING”, validator is unbonding
• 2 : “BOND_STATUS_UNBONDED”, validator is unbonded
• 3 : “BOND_STATUS_BONDED”, validator is bonded

Inputs

Name	Type	Description
status	string	the status of the validator
pageRequest	PageReq	request for pagination

PageReq is a struct with the following fields:

Name	Type	Description
key	bytes	the key of the page
offset	int64	the offset of the page
limit	int64	the limit of the page
countTotal	bool	whether to count the total number of results or not
reverse	bool	whether to reverse the results or not

Outputs

Name	Type	Description
validators	Validator[]	the arrays of the validators
pageResponse	PageResp	response for pagination

PageResp is a struct with the following fields:

Name	Type	Description
nextKey	bytes	the next key of the page
total	uint64	the total number of the results

redelegation

Returns the redelegation information of delegator, source validator and destination validator. If there is no redelegation found, empty RedelegationOutput will be returned.

Inputs

Name	Type	Description
delegatorAddress	address	the address of the delegator
srcValidatorAddress	address	the address of the source validator
dstValidatorAddress	address	the address of the destination validator

Outputs

Name	Type	Description
redelegation	RedelegationOutput	the information of the redelegation

RedelegationOutput is a struct with the following fields:

Name	Type	Description
delegatorAddress	address	the address of the delegator
validatorSrcAddress	address	the address of the source validator
validatorDstAddress	address	the address of the destination validator
entries	RedelegationEntry[]	the entries of the redelegation

RedelegationEntry is a struct with the following fields:

Name	Type	Description
creationHeight	uint64	the creation height of the entry
completionTime	uint64	the completion time of the entry
initialBalance	Coin	the initial balance of the entry
balance	Coin	the balance of the entry

redelegations

Returns all redelegations of delegator, source validator and destination validator. If there is no redelegation found, empty RedelegationResponse and PageResp will be returned.

Inputs

Name	Type	Description
delegatorAddress	address	the address of the delegator
srcValidatorAddress	address	the address of the source validator
dstValidatorAddress	address	the address of the destination validator
pageRequest	PageReq	request for pagination

Outputs

Name	Type	Description
response	RedelegationResponse[]	the information of the redelegations
pageResponse	PageResp	response for pagination

Events

CreateValidator

Name	Type	Indexed	Description
valiAddr	address	Y	the address of the validator
value	uint256	N	the amount of the staking token initially self-delegated to the validator

EditValidator

Name	Type	Indexed	Description
valiAddr	address	Y	the address of the validator
commissionRate	int256	N	the updated commission rate of the staking token rewarded by the validator
minSelfDelegation	int256	N	the updated minimum self-delegation amount of the validator

Delegate

Name	Type	Indexed	Description
delegatorAddr	address	Y	the address of the delegator
validatorAddr	string	Y	the address of the validator
amount	uint256	N	the amount of the staking token delegated to the validator
newShares	uint256	N	the amount of the delegation shares after the delegation

Unbond

Name	Type	Indexed	Description
delegatorAddr	address	Y	the address of the delegator
validatorAddr	string	Y	the address of the validator
amount	uint256	N	the amount of the staking token undelegated from the validator
completionTime	uint256	N	the completion time of the undelegation

Redelegate

Name	Type	Indexed	Description
delegatorAddr	address	Y	the address of the delegator
validatorSrcAddress	address	Y	the address of the source validator
validatorDstAddress	address	Y	the address of the destination validator
amount	uint256	N	the amount of the staking token for redelegation
completionTime	uint256	N	the completion time of the redelegate