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.
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### Unjail
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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)
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if info.Tombstoned
fail with "Tombstoned validator cannot be unjailed"
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if block time < info.JailedUntil
fail with "Validator still jailed, cannot unjail until period has expired"
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.