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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.
This commit is contained in:
glozow
2025-07-29 14:37:16 -04:00
parent 2e515d2897
commit 6da5de58ca
12 changed files with 49 additions and 47 deletions
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4
test/functional/wallet_bumpfee.py
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@@ -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})