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<ul class="chapter"><li><a href="./Intro.html"><strong>1.</strong> Intro</a></li><li><a href="./DagHistory.html"><strong>2.</strong> History</a></li><li><a href="./Wallet.html"><strong>3.</strong> Wallet</a></li><li><ul class="section"><li><a href="./Deterministic_wallet.html"><strong>3.1.</strong> Deterministic Wallet</a></li><li><a href="./Mnemonic.html"><strong>3.2.</strong> Mnemonic</a></li></ul></li><li><a href="./Testnet.html"><strong>4.</strong> Testnet & faucet</a></li><li><ul class="section"><li><a href="./BTC_testnet.html"><strong>4.1.</strong> Bitcoin Testnet</a></li><li><a href="./ETH_testnet.html"><strong>4.2.</strong> Ethereum Testnet</a></li><li><a href="./GByte_testnet.html"><strong>4.3.</strong> Byteball Testnet</a></li></ul></li><li><a href="./Address.html"><strong>5.</strong> Address</a></li><li><ul class="section"><li><a href="./btc_addr.html"><strong>5.1.</strong> Bitcoin Address</a></li></ul></li><li><a href="./Data_Structure.html"><strong>6.</strong> Data Structure</a></li><li><ul class="section"><li><a href="./Transcation.html"><strong>6.1.</strong> Transcation</a></li><li><a href="./btc_tx.html"><strong>6.2.</strong> Bitcoin Transaction</a></li><li><a href="./MerkleTree.html"><strong>6.3.</strong> MerkleTree</a></li><li><a href="./PatriciaTree.html"><strong>6.4.</strong> PatriciaTree</a></li><li><a href="./IAVL_Tree.html"><strong>6.5.</strong> Merkleized IAVL+ Tree</a></li><li><a href="./MerkleDAG.html"><strong>6.6.</strong> MerkleDAG</a></li></ul></li><li><a href="./Data_Storage.html"><strong>7.</strong> Data Storage</a></li><li><ul class="section"><li><a href="./btc_datastore.html"><strong>7.1.</strong> Bitcoin</a></li></ul></li><li><a href="./Consensus.html"><strong>8.</strong> Consensus algorithm</a></li><li><ul class="section"><li><a href="./Consensus_POS_Ouroboros.html"><strong>8.1.</strong> IOHK/Ouroboros</a></li><li><a href="./DFINITY.html"><strong>8.2.</strong> DFINITY</a></li><li><a href="./Stellar.html"><strong>8.3.</strong> Stellar(SCP)</a></li><li><a href="./Matrix.html"><strong>8.4.</strong> Matrix</a></li><li><a href="./Ripple.html"><strong>8.5.</strong> Ripple</a></li><li><a href="./Casper.html"><strong>8.6.</strong> Casper</a></li><li><a href="./PoA.html"><strong>8.7.</strong> POA(Parity)</a></li><li><a href="./Terndermint.html"><strong>8.8.</strong> Tendermint</a></li><li><a href="./Delegated_Consensus.html"><strong>8.9.</strong> dBFT(NEO/Antshare)/dPOS(BTS/Steem/EOS/Lisk)</a></li><li><a href="./Algorand.html"><strong>8.10.</strong> Algorand</a></li></ul></li><li><a href="./Scalability.html"><strong>9.</strong> Scalability</a></li><li><ul class="section"><li><a href="./Ouroboros_Praos.html"><strong>9.1.</strong> Ouroboros Praos</a></li><li><a href="./EOS.html"><strong>9.2.</strong> EOS</a></li><li><a href="./eth_parallelizability.html"><strong>9.3.</strong> Ethereum Parallelizability</a></li></ul></li><li><a href="./Validation.html"><strong>10.</strong> Validation</a></li><li><ul class="section"><li><a href="./Segwit.html"><strong>10.1.</strong> Segwit</a></li><li><a href="./Multisignature.html"><strong>10.2.</strong> Multisignature</a></li><li><a href="./Tx_Malleability.html"><strong>10.3.</strong> Transaction Malleability</a></li><li><a href="./Double_Spend.html"><strong>10.4.</strong> Double Spend</a></li><li><a href="./Peplay_Protect.html"><strong>10.5.</strong> Replay Protection</a></li><li><a href="./TrueBit.html"><strong>10.6.</strong> Truebit</a></li></ul></li><li><a href="./Money_Denomiation_Token.html"><strong>11.</strong> Money & Token</a></li><li><ul class="section"><li><a href="./TxFee_BTC.html" class="active"><strong>11.1.</strong> Bitcoin TxFee</a></li><li><a href="./RBF.html"><strong>11.2.</strong> Bitcoin Replace by fee</a></li><li><a href="./TxFee_ETH.html"><strong>11.3.</strong> Ethereum TxFee</a></li><li><a href="./ERC20.html"><strong>11.4.</strong> ERC20/ERC223/ERC721</a></li></ul></li><li><a href="./Crypto.html"><strong>12.</strong> Crypto Algorithm</a></li><li><ul class="section"><li><a href="./secp256k1.html"><strong>12.1.</strong> secp256k1</a></li><li><a href="./ZK-SNARKs.html"><strong>12.2.</strong> ZKP/ZK-SNARKs</a></li><li><a href="./CoinJoin.html"><strong>12.3.</strong> CoinJoin</a></li><li><a href="./RingSig.html"><strong>12.4.</strong> RingSig</a></li><li><a href="./Crypto_SM.html"><strong>12.5.</strong> SMx</a></li><li><a href="./PQC.html"><strong>12.6.</strong> Post-Quantum Cryptography</a></li></ul></li><li><a href="./Messaging.html"><strong>13.</strong> Messaging</a></li><li><a href="./Node_Discovery.html"><strong>14.</strong> Node discovery</a></li><li><ul class="section"><li><a href="./Gossip_Protocol.html"><strong>14.1.</strong> Gossip Protocol</a></li><li><a href="./DHT_Protocol.html"><strong>14.2.</strong> DHT Protocol</a></li></ul></li><li><a href="./Sync.html"><strong>15.</strong> Synchronization</a></li><li><ul class="section"><li><a href="./btc_sync.html"><strong>15.1.</strong> Bitcoin Header frist</a></li></ul></li><li><a href="./Interconnecting.html"><strong>16.</strong> Interconnect & Cross-chain</a></li><li><ul class="section"><li><a href="./ILP.html"><strong>16.1.</strong> Interledger Protocol (ILP)</a></li><li><a href="./DID.html"><strong>16.2.</strong> Decentralized Identifiers (DIDs)</a></li><li><a href="./0xProtocol.html"><strong>16.3.</strong> 0x Protocol</a></li><li><a href="./Polkadot.html"><strong>16.4.</strong> Polkadot</a></li><li><a href="./Cosmos.html"><strong>16.5.</strong> Cosmos</a></li><li><a href="./OmiseGO.html"><strong>16.6.</strong> OmiseGO</a></li></ul></li><li><a href="./Oracle.html"><strong>17.</strong> Oracle</a></li><li><ul class="section"><li><a href="./Gnosis.html"><strong>17.1.</strong> Gnosis</a></li><li><a href="./Augur.html"><strong>17.2.</strong> Augur</a></li><li><a href="./Amoveo.html"><strong>17.3.</strong> Amoveo</a></li><li><a href="./ZenProtocol.html"><strong>17.4.</strong> Zen Protocal</a></li></ul></li><li><a href="./SmartContract.html"><strong>18.</strong> SmartContract</a></li><li><ul class="section"><li><a href="./Asset_Contract.html"><strong>18.1.</strong> Asset</a></li><li><a href="./Loan_Contract.html"><strong>18.2.</strong> Loan</a></li></ul></li><li><a href="./VM.html"><strong>19.</strong> VM</a></li></ul>
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<a class="header" href="./TxFee_BTC.html#dust" id="dust"><h3>Dust</h3></a>
<p>"Dust" is defined in terms of <code>CTransaction::minRelayTxFee</code>, which has units <strong>satoshis-per-kilobyte</strong>.
If you'd pay more than 1/3 in fees to spend something, then we consider it dust.</p>
<ul>
<li>A typical spendable <strong>non-segwit txout</strong> is 34 bytes big, and will need a CTxIn of at least 148 bytes to spend:
so dust is a spendable txout less than <code>546*minRelayTxFee/1000</code> (in satoshis).</li>
<li>A typical spendable <strong>segwit txout</strong> is 31 bytes big, and will need a CTxIn of at least 67 bytes to spend:
so dust is a spendable txout less than <code>294*minRelayTxFee/1000</code> (in satoshis).</li>
</ul>
<p>By default, with a minimum relay fee of 0.00005BTC/KB, the dust is defined as <strong>2730 satoshi</strong>. If a transaction pays a decent fee but has an output that has less than 2730 satoshi, it won't be relayed by the nodes with this kind of configuration.</p>
<pre><code>546*5000/1000=2730
294*5000/1000=1740
</code></pre>
<p><strong>UPDATE for (0.15.x)</strong></p>
<pre><code>DUST_RELAY_TX_FEE = 3000
</code></pre>
<p>Min feerate for defining dust, Historically this has been based on the <code>minRelayTxFee</code>, however changing the dust limit changes which transactions are standard and should be done with care and ideally rarely. It makes sense to only increase the dust limit after prior releases were already not creating outputs below the new threshold.</p>
<a class="header" href="./TxFee_BTC.html#references" id="references"><h3>References</h3></a>
<ul>
<li>https://bitcointalk.org/index.php?topic=1728802.msg17300880#msg17300880</li>
<li></li>
<li>https://github.com/bitcoin/bitcoin/blob/v0.15.0.1/src/policy/policy.h#L48</li>
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