bluewallet
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bluewallet

  • CPFP — Bump transaction (child-pays-for-parent) — a technique that allows you to spend incoming transaction that is unconfirmed by sending it to your another address, but with the total fees higher than the original transaction. This helps if it takes forever for your incoming transaction to confirm on the blockchain.
  • RBF — Bump transaction (replace-by-fee) — if you sent a transaction and it’s still unconfirmed you can replace it with the one with higher fees, making it more attractive for miners to mine, thus, speeding up the confirmation.
  • RBF — Cancel transaction — a technique similar to regular RBF, but where the replacement transaction’s output is the address you control, thus, paying yourself, effectively cancelling the transaction.
  • Batch send — when creating a transaction add as many payees as you want. This helps to save on fees when having to pay multiple destinations. Making a nice UI/UX on this one was a challenge.
  • Flexible fees (starting from 1 sat per byte) and fee recommendations fetched from a real up-to-date bitcoin node.
  • Finally, from now on, we are promoting BIP84 Native SegWit wallets as the default wallet when users create a new wallet. We were warned and actually advised against that, as that triggers a stream of complaints from users who can’t withdraw coins from exchanges because exchanges still don’t recognize ‘bc1……’ addresses. But it’s time. Really. Users should take their complaints to obsolete exchanges. Native segwit will allow saving on fees even more.
Bluewallet vs Blockchain wallet
  • Connect to your own Bitcoin Node through Electrum server for maximum self-sovereignty, no SPVs, full node fashion.
  • Watch-only ZPUB wallets. Just scan the QR code with a ZPUB or input a ZPUB into the text field directly. XPUB and YPUB are supported as well.
  • With recent transition to PSBT under the hood, we added a workflow to have your transaction signed on your hardware wallet in a pure air-gapped fashion. Just mark your watch-only ZPUB wallet as working with an external HW wallet, then create a transaction and feed the QR code with the unsigned PSBT to your hardware wallet. Sign it on hardware wallet, scan it back to BlueWallet and broadcast it to the network. You have just conveniently made a transaction on your mobile device, while keeping your private keys on a secure hardware wallet, truly air-gapped! This is still in beta and only the CryptoAdvance device is 100% supported, but we will work on testing and polishing the integration with other hardware wallets.
  • Ongoing integration with HodlHodl. Non-custodial fiat-to-btc trading is an important bitcoin infrastructure project. It’s a hedge against all regulated exchanges going bad with AML/KYC.
  • When LND will be stable enough we will include it as part of the wallet, allowing users to switch their lightning wallets into non-custodial mode, and gradually make it the default mode. But custodial lightning brought some unexpected benefits, such as practically unlimited incoming capacity, instant on, zero onchain footprint. It makes sense to maintain both and explore possible synergies here.
  • Multisig wallets are hard to tackle, mostly UI/UX wise. A proper joining ceremony is a hard task to design. The ceremony of creating a transaction and inviting all participants to sign it, can also be a challenge.
  • To reach maximum security, it makes sense to use only multisig wallets with all keys residing on your own devices, preferably hardware wallets from different manufacturers. Designing, implementing and testing this flow is not easy.
  • Sign message with your wallet/verify. I strongly feel that your private keys should help you with authentication on 3rd-party services, but what’s the proper way to do that we do not know, yet.
  • Provide-UTXO — when creating a transaction, supply UTXO to use in form of JSON document. This allows using the wallet on a completely offline/air-gapped device, provided you carry with you your up-to-date UTXO set. Then you sign it, broadcast via SMS/pigeons/whatever and congrats! You can transact even from a desert island.
  • Choose UTXO / UTXO spend strategies — when creating a transaction, choose which UTXO (or UTXO strategy) you want to use. For example, you could strive for the smallest fees (use higher-value outputs first), optimize for amounts used (sum of input amounts are close to total output amounts — might produce dust output), or you could consolidate (use all available inputs — yes this completely destroys privacy but helps to prepare for a period of high fees) etc.
  • Coinjoin — a proper coins mix service with other peers is tricky, but we might attempt it.
  • RBF-Service. A trustless server that broadcasts your replacement transactions with higher fees if previous transaction wasn’t confirmed in a timeframe you specified. You can start with 1 sat/byte transaction and gradually increase fee until it’s confirmed in a reasonable time (with the smallest fee possible). Automatically. This is only an idea at the moment.
  • NFC. Users will be able to ‘tap-to-share’ their receive address to other users, and other NFC-capable devices. This will eliminate the requirement for users to have to fiddle with their device’s display brightness, and having to move around their camera view in order to scan a QR Code. This feature will also be useful for our upcoming BTCPayServer integration.
  • Push notifications have been set aside for too long, but they will be eventually done.
  • 32 production releases
  • 738 commits
  • 27 contributors

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Bitcoin wallet for iOS and android

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Igor Korsakov

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