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<title>Extrinsics (runtime) · Polkadot API Book</title>
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Chain state (runtime)
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Extrinsics (runtime)
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Events (runtime)
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<a href="." >Extrinsics (runtime)</a>
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<h2 id="extrinsics"><a id="top" style="text-decoration: none;">Extrinsics</a></h2>
<p><em>The following sections contain Extrinsics methods are part of the default Substrate runtime. Since an Extrinsic is a holder of an object that is just an array of bytes to be included, it does not have a return.</em></p>
<ul>
<li><p><strong><a href="#aura">aura</a></strong></p>
</li>
<li><p><strong><a href="#balances">balances</a></strong></p>
</li>
<li><p><strong><a href="#consensus">consensus</a></strong></p>
</li>
<li><p><strong><a href="#contract">contract</a></strong></p>
</li>
<li><p><strong><a href="#council">council</a></strong></p>
</li>
<li><p><strong><a href="#councilMotions">councilMotions</a></strong></p>
</li>
<li><p><strong><a href="#councilVoting">councilVoting</a></strong></p>
</li>
<li><p><strong><a href="#democracy">democracy</a></strong></p>
</li>
<li><p><strong><a href="#grandpa">grandpa</a></strong></p>
</li>
<li><p><strong><a href="#indices">indices</a></strong></p>
</li>
<li><p><strong><a href="#session">session</a></strong></p>
</li>
<li><p><strong><a href="#staking">staking</a></strong></p>
</li>
<li><p><strong><a href="#sudo">sudo</a></strong></p>
</li>
<li><p><strong><a href="#system">system</a></strong></p>
</li>
<li><p><strong><a href="#timestamp">timestamp</a></strong></p>
</li>
<li><p><strong><a href="#treasury">treasury</a></strong></p>
</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="balances"><a id="balances"></a>balances</h3>
<p>&#x25B8; <strong>setBalance</strong>(who: <code>Address</code>, free: <code>Compact&lt;Balance&gt;</code>, reserved: <code>Compact&lt;Balance&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the balances of a given account.</li>
</ul>
<p>&#x25B8; <strong>transfer</strong>(dest: <code>Address</code>, value: <code>Compact&lt;Balance&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Transfer some liquid free balance to another staker.</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="consensus"><a id="consensus"></a>consensus</h3>
<p>&#x25B8; <strong>noteOffline</strong>(offline: <code>InherentOfflineReport</code>)</p>
<ul>
<li><strong>summary</strong>: Note the previous block&apos;s validator missed their opportunity to propose a block.</li>
</ul>
<p>&#x25B8; <strong>remark</strong>(_remark: <code>Bytes</code>)</p>
<ul>
<li><strong>summary</strong>: Make some on-chain remark.</li>
</ul>
<p>&#x25B8; <strong>reportMisbehavior</strong>(_report: <code>Bytes</code>)</p>
<ul>
<li><strong>summary</strong>: Report some misbehaviour.</li>
</ul>
<p>&#x25B8; <strong>setCode</strong>(new: <code>Bytes</code>)</p>
<ul>
<li><strong>summary</strong>: Set the new code.</li>
</ul>
<p>&#x25B8; <strong>setHeapPages</strong>(pages: <code>u64</code>)</p>
<ul>
<li><strong>summary</strong>: Set the number of pages in the WebAssembly environment&apos;s heap.</li>
</ul>
<p>&#x25B8; <strong>setStorage</strong>(items: <code>Vec&lt;KeyValue&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set some items of storage.</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="contract"><a id="contract"></a>contract</h3>
<p>&#x25B8; <strong>call</strong>(dest: <code>Address</code>, value: <code>Compact&lt;Balance&gt;</code>, gas_limit: <code>Compact&lt;Gas&gt;</code>, data: <code>Bytes</code>)</p>
<ul>
<li><strong>summary</strong>: Make a call to a specified account, optionally transferring some balance. Make a call to a specified account, optionally transferring some balance.</li>
</ul>
<p>&#x25B8; <strong>create</strong>(endowment: <code>Compact&lt;Balance&gt;</code>, gas_limit: <code>Compact&lt;Gas&gt;</code>, ctor_code: <code>Bytes</code>, data: <code>Bytes</code>)</p>
<ul>
<li><strong>summary</strong>: Create a new contract, optionally transfering some balance to the created account. Creation is executed as follows: - the destination address is computed based on the sender and hash of the code. - account is created at the computed address. - the <code>ctor_code</code> is executed in the context of the newly created account. Buffer returned after the execution is saved as the <code>code</code> of the account. That code will be invoked upon any message received by this account.</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="council"><a id="council"></a>council</h3>
<p>&#x25B8; <strong>presentWinner</strong>(candidate: <code>Address</code>, total: <code>Compact&lt;Balance&gt;</code>, index: <code>Compact&lt;VoteIndex&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Claim that <code>signed</code> is one of the top Self::carry_count() + current_vote().1 candidates. Only works if the <code>block_number &gt;= current_vote().0</code> and <code>&lt; current_vote().0 + presentation_duration()`` </code>signed` should have at least</li>
</ul>
<p>&#x25B8; <strong>reapInactiveVoter</strong>(reporter_index: <code>Compact&lt;u32&gt;</code>, who: <code>Address</code>, who_index: <code>Compact&lt;u32&gt;</code>, assumed_vote_index: <code>Compact&lt;VoteIndex&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Remove a voter. For it not to be a bond-consuming no-op, all approved candidate indices must now be either unregistered or registered to a candidate that registered the slot after the voter gave their last approval set. May be called by anyone. Returns the voter deposit to <code>signed</code>.</li>
</ul>
<p>&#x25B8; <strong>removeMember</strong>(who: <code>Address</code>)</p>
<ul>
<li><strong>summary</strong>: Remove a particular member. A tally will happen instantly (if not already in a presentation period) to fill the seat if removal means that the desired members are not met. This is effective immediately.</li>
</ul>
<p>&#x25B8; <strong>retractVoter</strong>(index: <code>Compact&lt;u32&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Remove a voter. All votes are cancelled and the voter deposit is returned.</li>
</ul>
<p>&#x25B8; <strong>setApprovals</strong>(votes: <code>Vec&lt;bool&gt;</code>, index: <code>Compact&lt;VoteIndex&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set candidate approvals. Approval slots stay valid as long as candidates in those slots are registered.</li>
</ul>
<p>&#x25B8; <strong>setDesiredSeats</strong>(count: <code>Compact&lt;u32&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the desired member count; if lower than the current count, then seats will not be up election when they expire. If more, then a new vote will be started if one is not already in progress.</li>
</ul>
<p>&#x25B8; <strong>setPresentationDuration</strong>(count: <code>Compact&lt;BlockNumber&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the presentation duration. If there is currently a vote being presented for, will invoke <code>finalise_vote</code>.</li>
</ul>
<p>&#x25B8; <strong>setTermDuration</strong>(count: <code>Compact&lt;BlockNumber&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the presentation duration. If there is current a vote being presented for, will invoke <code>finalise_vote</code>.</li>
</ul>
<p>&#x25B8; <strong>submitCandidacy</strong>(slot: <code>Compact&lt;u32&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Submit oneself for candidacy. Account must have enough transferrable funds in it to pay the bond.</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="councilmotions"><a id="councilMotions"></a>councilMotions</h3>
<p>&#x25B8; <strong>propose</strong>(threshold: <code>Compact&lt;u32&gt;</code>, proposal: <code>Proposal</code>)</p>
<p>&#x25B8; <strong>vote</strong>(proposal: <code>Hash</code>, index: <code>Compact&lt;ProposalIndex&gt;</code>, approve: <code>bool</code>)</p>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="councilvoting"><a id="councilVoting"></a>councilVoting</h3>
<p>&#x25B8; <strong>propose</strong>(proposal: <code>Proposal</code>)</p>
<p>&#x25B8; <strong>setCooloffPeriod</strong>(blocks: <code>Compact&lt;BlockNumber&gt;</code>)</p>
<p>&#x25B8; <strong>setVotingPeriod</strong>(blocks: <code>Compact&lt;BlockNumber&gt;</code>)</p>
<p>&#x25B8; <strong>veto</strong>(proposal_hash: <code>Hash</code>)</p>
<p>&#x25B8; <strong>vote</strong>(proposal: <code>Hash</code>, approve: <code>bool</code>)</p>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="democracy"><a id="democracy"></a>democracy</h3>
<p>&#x25B8; <strong>cancelQueued</strong>(when: <code>Compact&lt;BlockNumber&gt;</code>, which: <code>Compact&lt;u32&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Cancel a proposal queued for enactment.</li>
</ul>
<p>&#x25B8; <strong>cancelReferendum</strong>(ref_index: <code>Compact&lt;ReferendumIndex&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Remove a referendum.</li>
</ul>
<p>&#x25B8; <strong>propose</strong>(proposal: <code>Proposal</code>, value: <code>Compact&lt;Balance&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Propose a sensitive action to be taken.</li>
</ul>
<p>&#x25B8; <strong>second</strong>(proposal: <code>Compact&lt;PropIndex&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Propose a sensitive action to be taken.</li>
</ul>
<p>&#x25B8; <strong>startReferendum</strong>(proposal: <code>Proposal</code>, threshold: <code>VoteThreshold</code>, delay: <code>BlockNumber</code>)</p>
<ul>
<li><strong>summary</strong>: Start a referendum.</li>
</ul>
<p>&#x25B8; <strong>vote</strong>(ref_index: <code>Compact&lt;ReferendumIndex&gt;</code>, vote: <code>Vote</code>)</p>
<ul>
<li><strong>summary</strong>: Vote in a referendum. If <code>vote.is_aye()</code>, the vote is to enact the proposal; otherwise it is a vote to keep the status quo.</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="grandpa"><a id="grandpa"></a>grandpa</h3>
<p>&#x25B8; <strong>reportMisbehavior</strong>(_report: <code>Bytes</code>)</p>
<ul>
<li><strong>summary</strong>: Report some misbehaviour.</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="session"><a id="session"></a>session</h3>
<p>&#x25B8; <strong>forceNewSession</strong>(apply_rewards: <code>bool</code>)</p>
<ul>
<li><strong>summary</strong>: Forces a new session.</li>
</ul>
<p>&#x25B8; <strong>setKey</strong>(key: <code>SessionKey</code>)</p>
<ul>
<li><strong>summary</strong>: Sets the session key of <code>_validator</code> to <code>_key</code>. This doesn&apos;t take effect until the next session.</li>
</ul>
<p>&#x25B8; <strong>setLength</strong>(new: <code>Compact&lt;BlockNumber&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set a new session length. Won&apos;t kick in until the next session change (at current length).</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="staking"><a id="staking"></a>staking</h3>
<p>&#x25B8; <strong>forceNewEra</strong>(apply_rewards: <code>bool</code>)</p>
<ul>
<li><strong>summary</strong>: Force there to be a new era. This also forces a new session immediately after. <code>apply_rewards</code> should be true for validators to get the session reward.</li>
</ul>
<p>&#x25B8; <strong>nominate</strong>(target: <code>Address</code>)</p>
<p>&#x25B8; <strong>registerPreferences</strong>(intentions_index: <code>Compact&lt;u32&gt;</code>, prefs: <code>ValidatorPrefs</code>)</p>
<ul>
<li><strong>summary</strong>: Set the given account&apos;s preference for slashing behaviour should they be a validator. An error (no-op) if <code>Self::intentions()[intentions_index] != origin</code>.</li>
</ul>
<p>&#x25B8; <strong>setBondingDuration</strong>(new: <code>Compact&lt;BlockNumber&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: The length of the bonding duration in eras.</li>
</ul>
<p>&#x25B8; <strong>setInvulnerables</strong>(validators: <code>Vec&lt;AccountId&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the validators who cannot be slashed (if any).</li>
</ul>
<p>&#x25B8; <strong>setOfflineSlashGrace</strong>(new: <code>Compact&lt;u32&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the offline slash grace period.</li>
</ul>
<p>&#x25B8; <strong>setSessionsPerEra</strong>(new: <code>Compact&lt;BlockNumber&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the number of sessions in an era.</li>
</ul>
<p>&#x25B8; <strong>setValidatorCount</strong>(new: <code>Compact&lt;u32&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: The ideal number of validators.</li>
</ul>
<p>&#x25B8; <strong>stake</strong>()</p>
<ul>
<li><strong>summary</strong>: Declare the desire to stake for the transactor. Effects will be felt at the beginning of the next era.</li>
</ul>
<p>&#x25B8; <strong>unnominate</strong>(target_index: <code>Compact&lt;u32&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Will panic if called when source isn&apos;t currently nominating target. Updates Nominating, NominatorsFor and NominationBalance.</li>
</ul>
<p>&#x25B8; <strong>unstake</strong>(intentions_index: <code>Compact&lt;u32&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Retract the desire to stake for the transactor. Effects will be felt at the beginning of the next era.</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="sudo"><a id="sudo"></a>sudo</h3>
<p>&#x25B8; <strong>setKey</strong>(new: <code>Address</code>)</p>
<p>&#x25B8; <strong>sudo</strong>(proposal: <code>Proposal</code>)</p>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="timestamp"><a id="timestamp"></a>timestamp</h3>
<p>&#x25B8; <strong>set</strong>(now: <code>Compact&lt;Moment&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the current time. Extrinsic with this call should be placed at the specific position in the each block (specified by the Trait::TIMESTAMP_SET_POSITION) typically at the start of the each block. This call should be invoked exactly once per block. It will panic at the finalization phase, if this call hasn&apos;t been invoked by that time. The timestamp should be greater than the previous one by the amount specified by <code>block_period</code>.</li>
</ul>
<hr>
<p><a href="#top" style="float: right; font-size: 1.6rem; font-weight: bold;">Back To Top</a></p>
<h3 id="treasury"><a id="treasury"></a>treasury</h3>
<p>&#x25B8; <strong>approveProposal</strong>(proposal_id: <code>Compact&lt;ProposalIndex&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Approve a proposal. At a later time, the proposal will be allocated to the beneficiary and the original deposit will be returned.</li>
</ul>
<p>&#x25B8; <strong>configure</strong>(proposal_bond: <code>Permill</code>, proposal_bond_minimum: <code>Compact&lt;Balance&gt;</code>, spend_period: <code>Compact&lt;BlockNumber&gt;</code>, burn: <code>Permill</code>)</p>
<ul>
<li><strong>summary</strong>: (Re-)configure this module.</li>
</ul>
<p>&#x25B8; <strong>proposeSpend</strong>(value: <code>Compact&lt;Balance&gt;</code>, beneficiary: <code>Address</code>)</p>
<ul>
<li><strong>summary</strong>: Put forward a suggestion for spending. A deposit proportional to the value is reserved and slashed if the proposal is rejected. It is returned once the proposal is awarded.</li>
</ul>
<p>&#x25B8; <strong>rejectProposal</strong>(proposal_id: <code>Compact&lt;ProposalIndex&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Reject a proposed spend. The original deposit will be slashed.</li>
</ul>
<p>&#x25B8; <strong>setPot</strong>(new_pot: <code>Compact&lt;Balance&gt;</code>)</p>
<ul>
<li><strong>summary</strong>: Set the balance of funds available to spend.</li>
</ul>
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