April 30, 2026

Error in blockchain.info wallet

My problem is that I can not do any transactions at all because of an error. BitcoindException(super=com.neemre.btcdcli4j.core.BitcoindException: Error #-26: 66: mempool min fee not met, code=-26). I set the standard (not customized) transaction fee to […]

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deriveChild and signing transactions using Bit-Wasp

I’m generating multiple children using one extended key. I have no problem generating public addresses: $master = HierarchicalKeyFactory::fromExtended(myKey); $key = $master->deriveChild(1); $publicAddress = $key->getPublicKey()->getAddress()->getAddress(); In order to sign a transaction, I need the public address’ […]

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Using a dedicated phone as “hardware wallet”

Is there anything inherently insecure about using a dedicated Android phone as a "hardware wallet"? A dedicated phone implies: a clean ROM without gapps, e.g. GrapheneOS, Lineage OS without root, etc full phone encryption enabled […]

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