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[policy] lower default minrelaytxfee and incrementalrelayfee to 100sat/kvB

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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.

Github-Pull: #33106
Rebased-From: 6da5de58ca
This commit is contained in:
glozow
2025-07-29 14:37:16 -04:00
parent bbdab3ef7b
commit 9dd7efc8c3
12 changed files with 54 additions and 52 deletions
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8
src/test/rbf_tests.cpp
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@@ -238,10 +238,10 @@ BOOST_FIXTURE_TEST_CASE(rbf_helper_functions, TestChain100Setup)
BOOST_CHECK(PaysForRBF(high_fee, high_fee - 1, 1, CFeeRate(0), unused_txid).has_value());
BOOST_CHECK(PaysForRBF(high_fee + 1, high_fee, 1, CFeeRate(0), unused_txid).has_value());
// Additional fees must cover the replacement's vsize at incremental relay fee
BOOST_CHECK(PaysForRBF(high_fee, high_fee + 1, 2, incremental_relay_feerate, unused_txid).has_value());
BOOST_CHECK(PaysForRBF(high_fee, high_fee + 2, 2, incremental_relay_feerate, unused_txid) == std::nullopt);
BOOST_CHECK(PaysForRBF(high_fee, high_fee + 2, 2, higher_relay_feerate, unused_txid).has_value());
BOOST_CHECK(PaysForRBF(high_fee, high_fee + 4, 2, higher_relay_feerate, unused_txid) == std::nullopt);
BOOST_CHECK(PaysForRBF(high_fee, high_fee + 1, 11, incremental_relay_feerate, unused_txid).has_value());
BOOST_CHECK(PaysForRBF(high_fee, high_fee + 1, 10, incremental_relay_feerate, unused_txid) == std::nullopt);
BOOST_CHECK(PaysForRBF(high_fee, high_fee + 2, 11, higher_relay_feerate, unused_txid).has_value());
BOOST_CHECK(PaysForRBF(high_fee, high_fee + 4, 20, higher_relay_feerate, unused_txid) == std::nullopt);
BOOST_CHECK(PaysForRBF(low_fee, high_fee, 99999999, incremental_relay_feerate, unused_txid).has_value());
BOOST_CHECK(PaysForRBF(low_fee, high_fee + 99999999, 99999999, incremental_relay_feerate, unused_txid) == std::nullopt);