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cosmos-sdk/docs/spec/slashing/transactions.md

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Transactions

In this section we describe the processing of transactions for the slashing module.

Unjail

If a validator was automatically unbonded due to downtime and wishes to come back online & possibly rejoin the bonded set, it must send TxUnjail:

type TxUnjail struct {
    ValidatorAddr sdk.AccAddress
}

handleMsgUnjail(tx TxUnjail)

    validator = getValidator(tx.ValidatorAddr)
    if validator == nil
      fail with "No validator found"

    if !validator.Jailed
      fail with "Validator not jailed, cannot unjail"

    info = getValidatorSigningInfo(operator)
    if block time < info.JailedUntil
      fail with "Validator still jailed, cannot unjail until period has expired"

    // Update the start height so the validator won't be immediately unbonded again
    info.StartHeight = BlockHeight
    setValidatorSigningInfo(info)

    validator.Jailed = false
    setValidator(validator)

    return

If the validator has enough stake to be in the top n = MaximumBondedValidators, they will be automatically rebonded, and all delegators still delegated to the validator will be rebonded and begin to again collect provisions and rewards.