mirror of https://github.com/bitcoin/bitcoin.git
[policy] lower default minrelaytxfee and incrementalrelayfee to 100sat/kvB
Let's say an attacker wants to use/exhaust the network's bandwidth, and has the choice between renting resources from a commercial provider and getting the network to "spam" itself it by sending unconfirmed transactions. We'd like the latter to be more expensive than the former. The bandwidth for relaying a transaction across the network is roughly its serialized size (plus relay overhead) x number of nodes. A 1000vB transaction is 1000-4000B serialized. With 100k nodes, that's 0.1-0.4GB If the going rate for commercial services is 10c/GB, that's like 1-4c per kvB of transaction data, so a 1000vB transaction should pay at least $0.04. At a price of 120k USD/BTC, 100sat is about $0.12. This price allows us to tolerate a large decrease in the conversion rate or increase in the number of nodes.
This commit is contained in:
glozow
parent
2e515d2897
commit
6da5de58ca
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@ -41,7 +41,7 @@ static constexpr unsigned int MAX_STANDARD_TX_SIGOPS_COST{MAX_BLOCK_SIGOPS_COST/
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/** The maximum number of potentially executed legacy signature operations in a single standard tx */
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static constexpr unsigned int MAX_TX_LEGACY_SIGOPS{2'500};
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/** Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or replacement **/
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static constexpr unsigned int DEFAULT_INCREMENTAL_RELAY_FEE{1000};
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static constexpr unsigned int DEFAULT_INCREMENTAL_RELAY_FEE{100};
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/** Default for -bytespersigop */
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static constexpr unsigned int DEFAULT_BYTES_PER_SIGOP{20};
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/** Default for -permitbaremultisig */
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@ -63,7 +63,7 @@ static constexpr unsigned int MAX_STANDARD_SCRIPTSIG_SIZE{1650};
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* outputs below the new threshold */
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static constexpr unsigned int DUST_RELAY_TX_FEE{3000};
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/** Default for -minrelaytxfee, minimum relay fee for transactions */
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static constexpr unsigned int DEFAULT_MIN_RELAY_TX_FEE{1000};
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static constexpr unsigned int DEFAULT_MIN_RELAY_TX_FEE{100};
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/** Default for -limitancestorcount, max number of in-mempool ancestors */
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static constexpr unsigned int DEFAULT_ANCESTOR_LIMIT{25};
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/** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool ancestors */
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@ -443,7 +443,7 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
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tx1.vout.resize(1);
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tx1.vout[0].scriptPubKey = CScript() << OP_1 << OP_EQUAL;
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tx1.vout[0].nValue = 10 * COIN;
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AddToMempool(pool, entry.Fee(10000LL).FromTx(tx1));
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AddToMempool(pool, entry.Fee(1000LL).FromTx(tx1));
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CMutableTransaction tx2 = CMutableTransaction();
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tx2.vin.resize(1);
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@ -451,7 +451,7 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
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tx2.vout.resize(1);
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tx2.vout[0].scriptPubKey = CScript() << OP_2 << OP_EQUAL;
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tx2.vout[0].nValue = 10 * COIN;
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AddToMempool(pool, entry.Fee(5000LL).FromTx(tx2));
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AddToMempool(pool, entry.Fee(500LL).FromTx(tx2));
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pool.TrimToSize(pool.DynamicMemoryUsage()); // should do nothing
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BOOST_CHECK(pool.exists(tx1.GetHash()));
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@ -469,7 +469,7 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
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tx3.vout.resize(1);
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tx3.vout[0].scriptPubKey = CScript() << OP_3 << OP_EQUAL;
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tx3.vout[0].nValue = 10 * COIN;
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AddToMempool(pool, entry.Fee(20000LL).FromTx(tx3));
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AddToMempool(pool, entry.Fee(2000LL).FromTx(tx3));
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pool.TrimToSize(pool.DynamicMemoryUsage() * 3 / 4); // tx3 should pay for tx2 (CPFP)
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BOOST_CHECK(!pool.exists(tx1.GetHash()));
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@ -481,7 +481,7 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
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BOOST_CHECK(!pool.exists(tx2.GetHash()));
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BOOST_CHECK(!pool.exists(tx3.GetHash()));
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CFeeRate maxFeeRateRemoved(25000, GetVirtualTransactionSize(CTransaction(tx3)) + GetVirtualTransactionSize(CTransaction(tx2)));
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CFeeRate maxFeeRateRemoved(2500, GetVirtualTransactionSize(CTransaction(tx3)) + GetVirtualTransactionSize(CTransaction(tx2)));
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BOOST_CHECK_EQUAL(pool.GetMinFee(1).GetFeePerK(), maxFeeRateRemoved.GetFeePerK() + DEFAULT_INCREMENTAL_RELAY_FEE);
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CMutableTransaction tx4 = CMutableTransaction();
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@ -532,10 +532,10 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
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tx7.vout[1].scriptPubKey = CScript() << OP_7 << OP_EQUAL;
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tx7.vout[1].nValue = 10 * COIN;
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AddToMempool(pool, entry.Fee(7000LL).FromTx(tx4));
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AddToMempool(pool, entry.Fee(1000LL).FromTx(tx5));
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AddToMempool(pool, entry.Fee(1100LL).FromTx(tx6));
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AddToMempool(pool, entry.Fee(9000LL).FromTx(tx7));
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AddToMempool(pool, entry.Fee(700LL).FromTx(tx4));
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AddToMempool(pool, entry.Fee(100LL).FromTx(tx5));
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AddToMempool(pool, entry.Fee(110LL).FromTx(tx6));
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AddToMempool(pool, entry.Fee(900LL).FromTx(tx7));
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// we only require this to remove, at max, 2 txn, because it's not clear what we're really optimizing for aside from that
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pool.TrimToSize(pool.DynamicMemoryUsage() - 1);
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@ -544,8 +544,8 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
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BOOST_CHECK(!pool.exists(tx7.GetHash()));
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if (!pool.exists(tx5.GetHash()))
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AddToMempool(pool, entry.Fee(1000LL).FromTx(tx5));
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AddToMempool(pool, entry.Fee(9000LL).FromTx(tx7));
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AddToMempool(pool, entry.Fee(100LL).FromTx(tx5));
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AddToMempool(pool, entry.Fee(900LL).FromTx(tx7));
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pool.TrimToSize(pool.DynamicMemoryUsage() / 2); // should maximize mempool size by only removing 5/7
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BOOST_CHECK(pool.exists(tx4.GetHash()));
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@ -553,8 +553,8 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
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BOOST_CHECK(pool.exists(tx6.GetHash()));
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BOOST_CHECK(!pool.exists(tx7.GetHash()));
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AddToMempool(pool, entry.Fee(1000LL).FromTx(tx5));
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AddToMempool(pool, entry.Fee(9000LL).FromTx(tx7));
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AddToMempool(pool, entry.Fee(100LL).FromTx(tx5));
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AddToMempool(pool, entry.Fee(900LL).FromTx(tx7));
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std::vector<CTransactionRef> vtx;
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SetMockTime(42);
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@ -238,10 +238,10 @@ BOOST_FIXTURE_TEST_CASE(rbf_helper_functions, TestChain100Setup)
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BOOST_CHECK(PaysForRBF(high_fee, high_fee - 1, 1, CFeeRate(0), unused_txid).has_value());
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BOOST_CHECK(PaysForRBF(high_fee + 1, high_fee, 1, CFeeRate(0), unused_txid).has_value());
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// Additional fees must cover the replacement's vsize at incremental relay fee
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BOOST_CHECK(PaysForRBF(high_fee, high_fee + 1, 2, incremental_relay_feerate, unused_txid).has_value());
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BOOST_CHECK(PaysForRBF(high_fee, high_fee + 2, 2, incremental_relay_feerate, unused_txid) == std::nullopt);
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BOOST_CHECK(PaysForRBF(high_fee, high_fee + 2, 2, higher_relay_feerate, unused_txid).has_value());
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BOOST_CHECK(PaysForRBF(high_fee, high_fee + 4, 2, higher_relay_feerate, unused_txid) == std::nullopt);
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BOOST_CHECK(PaysForRBF(high_fee, high_fee + 1, 11, incremental_relay_feerate, unused_txid).has_value());
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BOOST_CHECK(PaysForRBF(high_fee, high_fee + 1, 10, incremental_relay_feerate, unused_txid) == std::nullopt);
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BOOST_CHECK(PaysForRBF(high_fee, high_fee + 2, 11, higher_relay_feerate, unused_txid).has_value());
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BOOST_CHECK(PaysForRBF(high_fee, high_fee + 4, 20, higher_relay_feerate, unused_txid) == std::nullopt);
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BOOST_CHECK(PaysForRBF(low_fee, high_fee, 99999999, incremental_relay_feerate, unused_txid).has_value());
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BOOST_CHECK(PaysForRBF(low_fee, high_fee + 99999999, 99999999, incremental_relay_feerate, unused_txid) == std::nullopt);
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@ -585,7 +585,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
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# Higher fee, higher feerate, different txid, but the replacement does not provide a relay
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# fee conforming to node's `incrementalrelayfee` policy of 1000 sat per KB.
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assert_equal(self.nodes[0].getmempoolinfo()["incrementalrelayfee"], Decimal("0.00001"))
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assert_equal(self.nodes[0].getmempoolinfo()["incrementalrelayfee"], Decimal("0.000001"))
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tx.vout[0].nValue -= 1
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assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx.serialize().hex())
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@ -216,7 +216,7 @@ class EphemeralDustTest(BitcoinTestFramework):
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res = self.nodes[0].submitpackage([dusty_tx["hex"], sweep_tx["hex"]])
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assert_equal(res["package_msg"], "transaction failed")
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assert_equal(res["tx-results"][dusty_tx["wtxid"]]["error"], "min relay fee not met, 0 < 147")
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assert_equal(res["tx-results"][dusty_tx["wtxid"]]["error"], "min relay fee not met, 0 < 15")
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assert_equal(self.nodes[0].getrawmempool(), [])
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@ -206,7 +206,7 @@ class MempoolLimitTest(BitcoinTestFramework):
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# coin is no longer available, but the cache could still contain the tx.
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cpfp_parent = self.wallet.create_self_transfer(
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utxo_to_spend=replaced_tx["new_utxo"],
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fee_rate=mempoolmin_feerate - Decimal('0.00001'),
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fee_rate=mempoolmin_feerate - Decimal('0.000001'),
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confirmed_only=True)
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self.wallet.rescan_utxos()
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@ -312,9 +312,9 @@ class MempoolLimitTest(BitcoinTestFramework):
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target_vsize_each = 50000
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assert_greater_than(target_vsize_each * 2 * 3, node.getmempoolinfo()["maxmempool"] - node.getmempoolinfo()["bytes"])
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# Should be a true CPFP: parent's feerate is just below mempool min feerate
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parent_feerate = mempoolmin_feerate - Decimal("0.000001") # 0.1 sats/vbyte below min feerate
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parent_feerate = mempoolmin_feerate - Decimal("0.0000001") # 0.01 sats/vbyte below min feerate
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# Parent + child is above mempool minimum feerate
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child_feerate = (worst_feerate_btcvb * 1000) - Decimal("0.000001") # 0.1 sats/vbyte below worst feerate
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child_feerate = (worst_feerate_btcvb * 1000) - Decimal("0.0000001") # 0.01 sats/vbyte below worst feerate
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# However, when eviction is triggered, these transactions should be at the bottom.
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# This assertion assumes parent and child are the same size.
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miniwallet.rescan_utxos()
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@ -162,13 +162,13 @@ class PackageRBFTest(BitcoinTestFramework):
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self.log.info("Check replacement pays for incremental bandwidth")
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_, placeholder_txns3 = self.create_simple_package(coin)
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package_3_size = sum([tx.get_vsize() for tx in placeholder_txns3])
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incremental_sats_required = Decimal(package_3_size) / COIN
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incremental_sats_short = incremental_sats_required - Decimal("0.00000001")
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incremental_sats_required = (Decimal(package_3_size * 0.1) / COIN).quantize(Decimal("0.00000001"))
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incremental_sats_short = incremental_sats_required - Decimal("0.00000005")
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# Recreate the package with slightly higher fee once we know the size of the new package, but still short of required fee
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failure_package_hex3, failure_package_txns3 = self.create_simple_package(coin, parent_fee=DEFAULT_FEE, child_fee=DEFAULT_CHILD_FEE + incremental_sats_short)
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assert_equal(package_3_size, sum([tx.get_vsize() for tx in failure_package_txns3]))
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pkg_results3 = node.submitpackage(failure_package_hex3)
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assert_equal(f"package RBF failed: insufficient anti-DoS fees, rejecting replacement {failure_package_txns3[1].txid_hex}, not enough additional fees to relay; {incremental_sats_short} < {incremental_sats_required}", pkg_results3["package_msg"])
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assert_equal(f"package RBF failed: insufficient anti-DoS fees, rejecting replacement {failure_package_txns3[1].txid_hex}, not enough additional fees to relay; {incremental_sats_short:8f} < {incremental_sats_required:8f}", pkg_results3["package_msg"])
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self.assert_mempool_contents(expected=package_txns1)
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success_package_hex3, success_package_txns3 = self.create_simple_package(coin, parent_fee=DEFAULT_FEE, child_fee=DEFAULT_CHILD_FEE + incremental_sats_required)
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@ -562,12 +562,13 @@ class PackageRBFTest(BitcoinTestFramework):
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)
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node.sendrawtransaction(grandparent_result["hex"])
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minrelayfeerate = node.getnetworkinfo()["relayfee"]
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# Now make package of two descendants that looks
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# like a cpfp where the parent can't get in on its own
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self.ctr += 1
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parent_result = self.wallet.create_self_transfer(
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fee_rate=Decimal('0.00001000'),
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fee_rate=minrelayfeerate,
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utxo_to_spend=grandparent_result["new_utxo"],
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sequence=MAX_BIP125_RBF_SEQUENCE - self.ctr,
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)
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@ -13,9 +13,11 @@ from decimal import Decimal
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from math import ceil
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from test_framework.mempool_util import (
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DEFAULT_MIN_RELAY_TX_FEE,
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fill_mempool,
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)
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from test_framework.messages import (
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COIN,
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msg_tx,
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)
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from test_framework.p2p import (
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@ -31,9 +33,6 @@ from test_framework.wallet import (
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MiniWalletMode,
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)
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# 1sat/vB feerate denominated in BTC/KvB
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FEERATE_1SAT_VB = Decimal("0.00001000")
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class PackageRelayTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = True
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@ -49,12 +48,12 @@ class PackageRelayTest(BitcoinTestFramework):
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self.log.debug("Check that all nodes' mempool minimum feerates are above min relay feerate")
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for node in self.nodes:
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assert_equal(node.getmempoolinfo()['minrelaytxfee'], FEERATE_1SAT_VB)
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assert_greater_than(node.getmempoolinfo()['mempoolminfee'], FEERATE_1SAT_VB)
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assert_equal(node.getmempoolinfo()['minrelaytxfee'], Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN)
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assert_greater_than(node.getmempoolinfo()['mempoolminfee'], Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN)
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def create_basic_1p1c(self, wallet):
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low_fee_parent = wallet.create_self_transfer(fee_rate=FEERATE_1SAT_VB, confirmed_only=True)
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high_fee_child = wallet.create_self_transfer(utxo_to_spend=low_fee_parent["new_utxo"], fee_rate=999*FEERATE_1SAT_VB)
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low_fee_parent = wallet.create_self_transfer(fee_rate=Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN, confirmed_only=True)
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high_fee_child = wallet.create_self_transfer(utxo_to_spend=low_fee_parent["new_utxo"], fee_rate=999*Decimal(DEFAULT_MIN_RELAY_TX_FEE)/ COIN)
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package_hex_basic = [low_fee_parent["hex"], high_fee_child["hex"]]
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return package_hex_basic, low_fee_parent["tx"], high_fee_child["tx"]
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@ -85,8 +84,8 @@ class PackageRelayTest(BitcoinTestFramework):
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return [low_fee_parent_2outs["hex"], high_fee_child_2outs["hex"]], low_fee_parent_2outs["tx"], high_fee_child_2outs["tx"]
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def create_package_2p1c(self, wallet):
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parent1 = wallet.create_self_transfer(fee_rate=FEERATE_1SAT_VB*10, confirmed_only=True)
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parent2 = wallet.create_self_transfer(fee_rate=FEERATE_1SAT_VB*20, confirmed_only=True)
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parent1 = wallet.create_self_transfer(fee_rate=Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN * 10, confirmed_only=True)
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parent2 = wallet.create_self_transfer(fee_rate=Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN * 20, confirmed_only=True)
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child = wallet.create_self_transfer_multi(
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utxos_to_spend=[parent1["new_utxo"], parent2["new_utxo"]],
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fee_per_output=999*parent1["tx"].get_vsize(),
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@ -28,8 +28,8 @@ from test_framework.p2p import (
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)
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from test_framework.test_framework import BitcoinTestFramework
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MAX_FEE_FILTER = Decimal(9170997) / COIN
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NORMAL_FEE_FILTER = Decimal(100) / COIN
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MAX_FEE_FILTER = Decimal(9936506) / COIN
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NORMAL_FEE_FILTER = Decimal(10) / COIN
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class P2PIBDTxRelayTest(BitcoinTestFramework):
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@ -37,8 +37,8 @@ class P2PIBDTxRelayTest(BitcoinTestFramework):
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self.setup_clean_chain = True
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self.num_nodes = 2
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self.extra_args = [
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["-minrelaytxfee={}".format(NORMAL_FEE_FILTER)],
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["-minrelaytxfee={}".format(NORMAL_FEE_FILTER)],
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["-minrelaytxfee={:.8f}".format(NORMAL_FEE_FILTER)],
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["-minrelaytxfee={:.8f}".format(NORMAL_FEE_FILTER)],
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]
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def run_test(self):
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@ -13,10 +13,12 @@ import time
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from test_framework.blocktools import MAX_STANDARD_TX_WEIGHT
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from test_framework.mempool_util import (
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create_large_orphan,
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DEFAULT_MIN_RELAY_TX_FEE,
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fill_mempool,
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)
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from test_framework.messages import (
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CInv,
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COIN,
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COutPoint,
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CTransaction,
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CTxIn,
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@ -79,13 +81,13 @@ class PackageRelayTest(BitcoinTestFramework):
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]]
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def create_tx_below_mempoolminfee(self, wallet, utxo_to_spend=None):
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"""Create a 1-input 1sat/vB transaction using a confirmed UTXO. Decrement and use
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"""Create a 1-input 0.1sat/vB transaction using a confirmed UTXO. Decrement and use
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self.sequence so that subsequent calls to this function result in unique transactions."""
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self.sequence -= 1
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assert_greater_than(self.nodes[0].getmempoolinfo()["mempoolminfee"], FEERATE_1SAT_VB)
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assert_greater_than(self.nodes[0].getmempoolinfo()["mempoolminfee"], Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN)
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return wallet.create_self_transfer(fee_rate=FEERATE_1SAT_VB, sequence=self.sequence, utxo_to_spend=utxo_to_spend, confirmed_only=True)
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return wallet.create_self_transfer(fee_rate=Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN, sequence=self.sequence, utxo_to_spend=utxo_to_spend, confirmed_only=True)
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@cleanup
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def test_basic_child_then_parent(self):
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@ -30,9 +30,9 @@ from .wallet import (
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)
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# Default for -minrelaytxfee in sat/kvB
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DEFAULT_MIN_RELAY_TX_FEE = 1000
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DEFAULT_MIN_RELAY_TX_FEE = 100
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# Default for -incrementalrelayfee in sat/kvB
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DEFAULT_INCREMENTAL_RELAY_FEE = 1000
|
||||
DEFAULT_INCREMENTAL_RELAY_FEE = 100
|
||||
|
||||
def assert_mempool_contents(test_framework, node, expected=None, sync=True):
|
||||
"""Assert that all transactions in expected are in the mempool,
|
||||
|
|
|
|||
|
|
@ -535,7 +535,7 @@ def test_dust_to_fee(self, rbf_node, dest_address):
|
|||
|
||||
def test_settxfee(self, rbf_node, dest_address):
|
||||
self.log.info('Test settxfee')
|
||||
assert_raises_rpc_error(-8, "txfee cannot be less than min relay tx fee", rbf_node.settxfee, Decimal('0.000005'))
|
||||
assert_raises_rpc_error(-8, "txfee cannot be less than min relay tx fee", rbf_node.settxfee, Decimal('0.0000005'))
|
||||
assert_raises_rpc_error(-8, "txfee cannot be less than wallet min fee", rbf_node.settxfee, Decimal('0.000015'))
|
||||
# check that bumpfee reacts correctly to the use of settxfee (paytxfee)
|
||||
rbfid = spend_one_input(rbf_node, dest_address)
|
||||
|
|
@ -850,7 +850,7 @@ def test_bumpfee_with_feerate_ignores_walletincrementalrelayfee(self, rbf_node,
|
|||
|
||||
# Ensure you can not fee bump if the fee_rate is more than original fee_rate but the total fee from new fee_rate is
|
||||
# less than (original fee + incrementalrelayfee)
|
||||
assert_raises_rpc_error(-8, "Insufficient total fee", rbf_node.bumpfee, tx["txid"], {"fee_rate": 2.8})
|
||||
assert_raises_rpc_error(-8, "Insufficient total fee", rbf_node.bumpfee, tx["txid"], {"fee_rate": 2.05})
|
||||
|
||||
# You can fee bump as long as the new fee set from fee_rate is at least (original fee + incrementalrelayfee)
|
||||
rbf_node.bumpfee(tx["txid"], {"fee_rate": 3})
|
||||
|
|
|
|||
Loading…
Reference in New Issue