Questions tagged [android]

Collects general questions about using Bitcoin on Android devices. For questions about the popular wallet use btc-wallet-for-android.

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1answer
109 views

Wallet app disappeared from app store, is my money gone?

I've held some cash in an app called Coinbox, by Coinbox Inc. (1m+ users according to Google Play) and wanted to transfer it today. It seemed to have lost its functionality, so I uninstalled and ...
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0answers
22 views

Extract recovery key from Android phone

This is one of those extremely rare moments that usually doesn't happen and when it does, it's hard to find a way to fix it. but we are here to solve the impossible right? :D Jokes aside, there is ...
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1answer
97 views

Electrum Bitcoin Wallet from Google Play Store

I recently found out that although the version was exactly the same, the Electrum wallet downloaded from the Play Store is heavier than the app downloaded from the Electrum website. This raises the ...
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0answers
25 views

Build 'chaincase' wallet for Android in Visual Studio 2019

Repository: https://github.com/chaincase-app/chaincase How to build this in Visual Studio 2019? I am getting few errors: I see that Xamarin is used in the project and one directory with name ...
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1answer
72 views

Adroid Blockchain wallet ver 4.0.12 recovery

Just repaired my old Android phone, with Blockchain wallet version 4.0.12. It is asking for either the four digit PIN or the password, which I have both forgotten. Is there any way to recover this now ...
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1answer
525 views

Electrum on Android - where is wallet.dat hidden?

Does anyone knows where Electrum android app saves its wallet.dat on phone/sd memory? If such files exists is it possible to transfer it between phones? I have forgotten my seed words (and do not want ...
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0answers
34 views

On the Bitcoin wallet app for Android

I can't switch between addresses so any coin I have in other wallets isn't accessible. Does anyone know how to solve this? It's the app with the bitcoin symbol on a yellow circle background for ...
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0answers
112 views

Recovering wallet from old android device

Please forgive me my utter foolishness in the matter and probably most newbie question possible, but there is much at stake for me and I have run out of alternatives. Around the year 2014 I had ...
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0answers
120 views

Retrieve Bitcoin from Deleted Mycelium Wallet

Good morning, There have been a few threads about this but none particular to my situation. I have an old Samsung Galaxy S4 that had some Bitcoin on a the Mycelium Wallet app in 2015. Something ...
2
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1answer
241 views

Can I change current receiving address in Bitcoin Wallet app?

I download Bitcoin Wallet app. I receive BTC on first address (old type), but after some time second address (bech-32) became "this is you current address for receiving". Can I change ...
0
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1answer
162 views

Importing bitcoinj mnemonic into electrum or deriving private keys from mnemonic

I am having a really hard time backing up my bitcoinj mnemonic and importing it somewhere else. I am backing up the mnemonic like so: Wallet wallet = Wallet.createDeterministic(params, Script....
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2answers
2k views

How do you type the ₿ Bitcoin Symbol in Android Google Keyboard?

Is there a way to enable the Bitcoin symbol on my Android 9 Google Keyboard? I don't see it anywhere.
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2answers
192 views

Is the electrum android private key secure?

I have used electrum for many years on my desktop pc, and have alway felt very secure in doing so because of my ability to use a very strong password to encrypt my seed phrase with. However I just ...
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0answers
392 views

Mycelium not reading segwit bech32 (bc1) addresses from a private key

I'm trying to import my bitcoin private key into the Mycelium android wallet, but it keeps showing up as the legacy address that starts with 1xxx. I sent some coins to the bc1 address and I verified ...
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1answer
248 views

How to sweep a bc1... bitcoin segwit address using a mobile app?

I have a bitcoin private key with some money on the segwit bc1 address, but when I try to sweep this private key using mycellium android wallet, it shows up as a 3... address. What other mobile app ...
2
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1answer
667 views

How do custodial lightning wallets work?

I just installed and tried to use a lightning wallet (bluewallet) on an Android device. As per my understanding, when I fund my lightning wallet (This is an on-chain tx) with amount x, I open a ...
3
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1answer
317 views

ECDSA signature with r value of 31?

occasionally on Android we are generating an ECDSA signature. This turns out to have a "r" length of 31 bytes. Is that valid? For reference here is a nice diagram outlining the ASN.1 structure of ...
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1answer
75 views

When downloading the blockchain my application is become unusable, is there an issue with my code or am I using the BitcoinJ library incorrectly?

I am building a Bitcoin wallet with the BitcoinJ Library, after looking at the example of fetching a transaction that they have shown on their github it shows that you need to download the blockchain ...
0
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1answer
504 views

How to recover bitcoins from personal wallet app in android which is uninstalled?

I am using a bitcoin Non-deterministic wallet created by a private firm. In which there are few bitcoins worth 100$ Somehow I clear data of the android App, and Now all the memories related to my ...
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1answer
97 views

Is it safe to store user's secure pass-code in database with encrypted form while creating bitcoin wallet?

I would like to create a Bitcoin Wallet. Part of the process is to store public and private keys in encrypted form in server database. All keys I am storing is encrypted using user's passcode. 1) ...
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1answer
284 views

Get private-keys from bitcoinj

I'm using bitcoinj library for bitcoin. I want all private keys of all my generated addresses. How can I achieve that? Please help who knows this answer. Thanks.
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1answer
155 views

Change derive path

I've used bitcoinj wallet and used derive path as below. public static final ImmutableList<ChildNumber> ACCOUNT_ZERO_PATH = ImmutableList.of(ChildNumber.ZERO_HARDENED); But I made changes in ...
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1answer
1k views

how to validate testnet and mainnet bitcoin address via online api or offline for Android App?

I would like to know web api provider to validate Mainnet & Testet3 Bitcoin Address. How to validate a Bitcoin address is a real one? Validate bitcoin address from android application Gone ...
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2answers
2k views

How to display a list of incoming bitcoin Transaction history in my own wallet?

I have gone through various references including How to get a history of incoming and outgoing transactions for a certain address? Fetch list of transaction where i have received the bitcoin? I am ...
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1answer
80 views

Bitcoinj Standard

I'm using bitcoinj for transferring bitcoin. I don't know which standard bitcoinj supports? Bip32, Bip39, or Bip44 Please help who knows the answer. Also I want convert bitcoinj standard to Bip44. ...
2
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1answer
816 views

Get private-keys from wallet using bitcoinj

I'm using bitcoinj for transferring bitcoin. Now I want to export private key of my wallet. So how can I get the private key from bitcoinj?
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1answer
361 views

Issue with the BitcoinJ for Litecoin. Which dependency can be used for Litecoin?

I've created a crypto-currency wallet for Bitcoin using BitcoinJ. Now I want to add Litecoin in this wallet. How to implement BitcoinJ dependency for Litecoin? While using BitcoinJ for both Litecoin ...
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1answer
34 views

bitcoin transfer without creating wallet

My question is about transferring bitcoin between two addresses without having a wallet. Here is my idea of transferring bitcoins in following way: Idea: I have my own Android Application. I am ...
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1answer
1k views

convert 12 word seed into 24 word seed

I used bitcoinj library for wallet and it generates 12 word mnemonic seed. But I made changes in it and created 24 word mnemonic seed. But I need to convert old 12 word mnemonic seed into new 24 ...
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1answer
324 views

Bitcoin wallet on smart phone drains battery a lot?

I downloaded Android Bitcoin Wallet (version 6.17) on my android phone, and realized that the app drains battery a lot. The system showed 40% of battery was used to the wallet. Does anyone have same ...
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1answer
554 views

Can legacy wallets with 1xxx addresses send to segwit 3xxx and bc1xxx addresses like mycellium that only does 1xxx addresses?

I have mycellium for android and currently they dont support any segwit addresses that has 3xxx or bc1xxx. Can I send out from my mycellium 1xxx address to my segwit 3xxx or bc1xxx address that I ...
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1answer
198 views

Android on Copay still available?

Hi I was downloading Copay and it said ; WARNING: Chrome App will not longer be supported Google has announced that it will be ending support for Chrome Apps on non-Chrome OS platforms in 2018....
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1answer
5k views

Build a wallet for Android and iOS for a self-made cryptocurrency

I've built a cryptocurrency of my own using this video guide. I did the first 4 steps out of 6, as the 5th level is about building a wallet for Windows platform. I have started creating this ...
2
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1answer
877 views

How to create an offline wallet on Android only to sign transaction

I am new to bitcoins, I want to create an offline wallet on Android, to scan transaction QR code from online Desktop wallet, Sign that transaction with private key on my offline wallet. 1 Creating ...
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1answer
238 views

Bitcoin Wallet for Android - permission denied decrypting the wallet backup file using OpenSSL

I've followed the advice found on the https://github.com/bitcoin-wallet/bitcoin-wallet/blob/master/wallet/README.recover.md, but I'm having issues decrypted a wallet backup file When I run below line ...
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3answers
1k views

Full block chain on a mobile phone

The full block chain size is currently roughly 145GB, I can handle such a download in a laptop or a desktop pc but how does it work on a mobile? I cannot download such an amount of data into my phone, ...
2
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2answers
2k views

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 ...
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2answers
1k views

How to track multiple bitcoin addresses?

Let's say I have multiple (N) wallets, with N public addresses and N private addresses. Is there a simple way to track the balance (and transactions, but this is not so important) of those wallets? ...
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0answers
122 views

How return transaction hash from wallet to android app after payment?

Scenario: I have my android app where customers can pay by bitcoins. For this I created intent with uri like: bitcoin:[address]?amount=.. and using startActivityForResult it opens wallet with ...
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1answer
600 views

Bitcoin Wallet for Android/Windows with Full Control of BTC (keys) [duplicate]

I used to manage my bitcoin by using MultiBit for Windows. I had full control of them, without any involvement from a 3rd party. But as a person i know wanted to get bitcoin and a Android wallet, i ...
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0answers
790 views

How to claim bitcoin cash for Bitcoin Wallet backup created before 1st August2017? [closed]

I use this bitcoin wallet for android for my bitcoins.. I had created backup well before 1st August 2017 from Safety>>Backup My Wallet.. The backup is encrypted with name bitcoin-wallet-backup-2017-...
8
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3answers
4k views

Claim Bitcoin cash from android bitcoin app

I have some bitcoin stored in the bitcoin wallet android app I want to transfer my inherited Bitcoin Cash (BCC) to an exchange. The android app doesn't care about BCC. I tried to decode a backup of ...
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1answer
1k views

Bitcoin Wallet for Android - Issues decrypting the wallet backup BIN file using OpenSSL

I've followed the advice found here and also on the Github article linked from that post, but I'm still having issues decrypted a wallet backup using the latest version of Bitcoin Wallet on Android (...
0
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1answer
414 views

WalletAppKit creates an address every time Bitcoinj gets initialized

I'm implementing an app using BitcoinJ, but every time I run the code, a new address is created. Is there any way to work with the very first address that was created and stop creating new addresses? ...
2
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2answers
2k views

How do I spend a paper wallet into my coinbase.com account using the Android Coinbase app and the paper wallet QR code?

I created a paper wallet using bitaddress.org and spent bitcoins into it using the Coinbase mobile (Android App). I then noticed that the paper wallet cut off part of the private key during printing! ...
3
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1answer
2k views

Create Android Alt Coin Wallet

I am looking for base steps or general guidelines how to create lightweight android wallet for existing alt coin "X". So, lets start with simple questions: Do I need to run a node on the server Can ...
2
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1answer
703 views

Are there any POS coin open source mobile wallets implementations?

Specifically, I'm interested in the thick clients with Simplified Payment Verification. Haven't found these so far, do they even exist? Why are the POS mobile wallets such poorly distributed ...
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2answers
484 views

How to access bitcoin wallet on an android that became unresponsive?

My Galaxy S4 mini suddenly stopped working for no apparent reason. It won't turn on via any recommended action or new battery, recovery software from the laptop can't seem to connect as a result. I ...
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2answers
512 views

how do i programmatically find out whether this phone has a wallet with at least a certain arbitrary amount of bitcoin in it?

the use case is: i have a bitcoin-aware app A, which would then like to trigger a bitcoin payment request to be executed by an on-phone bitcoin wallet via the BIB20/bitcoin: URL mechanism. Rather ...
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2answers
214 views

Removing Bitcoin from my phone to secure storage

I am using the following Bitcoin wallet for Android: https://github.com/bitcoin-wallet/bitcoin-wallet My device is encrypted and I have encrypted backup files on Google Drive. However, I'd like to ...