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Upgrade to Bitcoin Core 32.1 #3425

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e117a39
Make InteractiveTxBuilderSpec work with bitoin core's new estimator
sstone Oct 22, 2026
bd20fd1
Upgrade to bitcoin core 32.1
sstone Oct 29, 2026
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5 changes: 4 additions & 1 deletion docs/release-notes/eclair-vnext.md
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Expand Up @@ -4,7 +4,10 @@

## Major changes

<insert changes>
### Update minimal version of Bitcoin Core

With this release, eclair requires using Bitcoin Core 32.x.
Newer versions of Bitcoin Core may be used, but have not been extensively tested.

### Configuration changes

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12 changes: 6 additions & 6 deletions eclair-core/pom.xml
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Expand Up @@ -85,8 +85,8 @@
<activeByDefault>true</activeByDefault>
</activation>
<properties>
<bitcoind.url>https://bitcoincore.org/bin/bitcoin-core-31.1/bitcoin-31.1-x86_64-linux-gnu.tar.gz</bitcoind.url>
<bitcoind.sha256>b80d9c3e04da78fb6f0569685673418cf686fadba9042d926d13fb87ff503f9e</bitcoind.sha256>
<bitcoind.url>https://bitcoincore.org/bin/bitcoin-core-32.1/bitcoin-32.1-x86_64-linux-gnu.tar.gz</bitcoind.url>
<bitcoind.sha256>61545c17c3120fb7412f896d248b11993af04ec8817aad3649c55b2afb044963</bitcoind.sha256>
</properties>
</profile>
<profile>
Expand All @@ -97,8 +97,8 @@
</os>
</activation>
<properties>
<bitcoind.url>https://bitcoincore.org/bin/bitcoin-core-31.1/bitcoin-31.1-x86_64-apple-darwin.tar.gz</bitcoind.url>
<bitcoind.sha256>bc506958d0f387c1ea770bdc7c7192a505fa645ff62cabcc7761fa7eb89e867e</bitcoind.sha256>
<bitcoind.url>https://bitcoincore.org/bin/bitcoin-core-32.1/bitcoin-32.1-x86_64-apple-darwin.tar.gz</bitcoind.url>
<bitcoind.sha256>53b1e6ffd92843ca82ef4a737d7a53cb0a9fab15816a417a41f12fc954071447</bitcoind.sha256>
</properties>
</profile>
<profile>
Expand All @@ -109,8 +109,8 @@
</os>
</activation>
<properties>
<bitcoind.url>https://bitcoincore.org/bin/bitcoin-core-31.1/bitcoin-31.1-win64.zip</bitcoind.url>
<bitcoind.sha256>c99ef173471c58e6766d9eebd12e6c35349082eeed3939bc99eed58ef57db587</bitcoind.sha256>
<bitcoind.url>https://bitcoincore.org/bin/bitcoin-core-32.1/bitcoin-32.1-win64.zip</bitcoind.url>
<bitcoind.sha256>b5b0c2cd007d69e96880907c79f9ae19ae82728f95fc8c923b4a07dab795b45d</bitcoind.sha256>
</properties>
</profile>
</profiles>
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2 changes: 1 addition & 1 deletion eclair-core/src/main/scala/fr/acinq/eclair/Setup.scala
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Expand Up @@ -199,7 +199,7 @@ class Setup(val datadir: File,
await(getBitcoinStatus(bitcoinClient), 30 seconds, "bitcoind did not respond after 30 seconds")
}
logger.info(s"bitcoind version=${bitcoinStatus.version}")
assert(bitcoinStatus.version >= 310000, "Eclair requires Bitcoin Core 31 or higher")
assert(bitcoinStatus.version >= 320000, "Eclair requires Bitcoin Core 32 or higher")
bitcoinStatus.unspentAddresses.foreach { address =>
val isSegwit = addressToPublicKeyScript(bitcoinStatus.chainHash, address).map(script => Script.isNativeWitnessScript(script)).getOrElse(false)
assert(isSegwit, s"Your wallet contains non-segwit UTXOs (e.g. address=$address). You must send those UTXOs to a segwit address to use Eclair (check out our README for more details).")
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2 changes: 1 addition & 1 deletion eclair-core/src/test/scala/fr/acinq/eclair/blockchain/bitcoind/BitcoindService.scala
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Expand Up @@ -62,7 +62,7 @@ trait BitcoindService extends Logging {

val PATH_BITCOIND = sys.env.get("BITCOIND_DIR") match {
case Some(customBitcoinDir) => new File(customBitcoinDir, "bitcoind")
case None => new File(TestUtils.BUILD_DIRECTORY, "bitcoin-31.1/bin/bitcoind")
case None => new File(TestUtils.BUILD_DIRECTORY, "bitcoin-32.1/bin/bitcoind")
}
logger.info(s"using bitcoind: $PATH_BITCOIND")
val PATH_BITCOIND_DATADIR = new File(INTEGRATION_TMP_DIR, "datadir-bitcoin")
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6 changes: 5 additions & 1 deletion eclair-core/src/test/scala/fr/acinq/eclair/channel/InteractiveTxBuilderSpec.scala
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Expand Up @@ -1530,7 +1530,11 @@ class InteractiveTxBuilderSpec extends TestKitBaseClass with AnyFunSuiteLike wit
test("fund transaction with previous inputs (with new inputs)") {
val targetFeerate = FeeratePerKw(11_000 sat)
val fundingA = 100_000 sat
val utxosA = Seq(55_000 sat, 55_000 sat, 55_000 sat)
// Two inputs are enough to fund the channel, but they don't leave enough room for a change output: at the target
// feerate, a transaction with two p2tr inputs and the funding output costs ~7_436 sat, while adding a change output
// would cost ~9_328 sat, which is more than the 8_000 sat remaining. This makes the first attempt changeless
// regardless of Bitcoin Core's internal change-discard rules, which depend on its fee estimators.
val utxosA = Seq(54_000 sat, 54_000 sat, 54_000 sat)
withFixture(ChannelTypes.AnchorOutputsZeroFeeHtlcTx(), fundingA, utxosA, 0 sat, Nil, targetFeerate, 660 sat, 0, RequireConfirmedInputs(forLocal = false, forRemote = false)) { f =>
import f._

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