Not able to sign transaction with absolute lock time as date not block hight (Sparrow)

[roundish594]

In Sparrow I can sign a transaction with absolute lock time defined at a specific block hight. But when I select a date I get an error message when trying to sign ("invalid input"). The following details are available from the Sparrow log files:

2025-07-20 21:45:42,784 ERROR [JavaFX Application Thread] c.s.s.c.DevicePane [null:-1] Signing Error: invalid input com.sparrowwallet.sparrow.io.SignTransactionException: invalid input at com.sparrowwallet.sparrow@2.2.3/com.sparrowwallet.sparrow.io.Hwi.signPSBT(Unknown Source) at com.sparrowwallet.sparrow@2.2.3/com.sparrowwallet.sparrow.io.Hwi$SignPSBTService$1.call(Unknown Source) at com.sparrowwallet.sparrow@2.2.3/com.sparrowwallet.sparrow.io.Hwi$SignPSBTService$1.call(Unknown Source) at javafx.graphics@23.0.2/javafx.concurrent.Task$TaskCallable.call(Unknown Source) at java.base/java.util.concurrent.FutureTask.run(Unknown Source) at javafx.graphics@23.0.2/javafx.concurrent.Service.lambda$executeTask$6(Unknown Source) at java.base/java.security.AccessController.doPrivileged(Unknown Source) at javafx.graphics@23.0.2/javafx.concurrent.Service.lambda$executeTask$7(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.base/java.lang.Thread.run(Unknown Source) Caused by: com.sparrowwallet.lark.bitbox02.BitBox02Exception: invalid input at com.sparrowwallet.lark/com.sparrowwallet.lark.bitbox02.BitBox02Device.msgQuery(Unknown Source) at com.sparrowwallet.lark/com.sparrowwallet.lark.BitBox02Client.btcSign(Unknown Source) at com.sparrowwallet.lark/com.sparrowwallet.lark.BitBox02Client.signTransaction(Unknown Source) at com.sparrowwallet.lark/com.sparrowwallet.lark.SignPsbtOperation.apply(Unknown Source) at com.sparrowwallet.lark/com.sparrowwallet.lark.Lark.enumerateHidClients(Unknown Source) at com.sparrowwallet.lark/com.sparrowwallet.lark.Lark.enumerate(Unknown Source) at com.sparrowwallet.lark/com.sparrowwallet.lark.Lark.signTransaction(Unknown Source) ... 11 common frames omitted

[benma]

Apologies for the late comment, I thought I had typed one out already and must have missed to click the 'Comment' button 🙈

Anyway, the BitBox02 indeed does not support time-based nLockTime:

bitbox02-firmware/src/rust/bitbox02-rust/src/hww/api/bitcoin/signtx.rs

Line 667 in ae18fce

// Currently we do not support time-based nlocktime

Time-based locktimes are a rarely used feature. What was your intended use case, and could you achive the same with block based lock times?

[roundish594]

All good, thanks for the reply. I thought this was a bug, but I can manage to use block based lock times.