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Questions tagged [android]

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

0
votes
1answer
39 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 ...
3
votes
1answer
39 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 ...
0
votes
1answer
19 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
votes
1answer
198 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 ...
0
votes
1answer
53 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) ...
0
votes
1answer
101 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.
0
votes
1answer
77 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 ...
1
vote
1answer
397 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 ...
1
vote
2answers
261 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 ...
0
votes
1answer
58 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. ...
1
vote
1answer
207 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?
0
votes
1answer
106 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 ...
0
votes
1answer
21 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 ...
0
votes
1answer
102 views

Restore from 24 words seed

I have used bitcoinj for createting wallet. I made some changes and try to generate 24 words seed instead of 12 words seed. When I try to restore from 24 words seed, at that time I am using 3 method ...
0
votes
1answer
211 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 ...
0
votes
0answers
157 views

Older Android Bitcoin Wallet Backup, Bitcoins lost because of transactions done afterwards?

I use the Android Bitcoin Wallet App (https://play.google.com/store/apps/details?id=de.schildbach.wallet). I have an old backup from my wallet and also still know the password. My old phone crashed ...
1
vote
1answer
144 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 ...
0
votes
0answers
77 views

Where can I get Copay wallet APK?

Their Github does not have the latest APK and I want to sideload the app on my tablet.
0
votes
1answer
325 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 ...
-1
votes
1answer
134 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....
0
votes
1answer
4k 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
votes
1answer
524 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 ...
0
votes
1answer
165 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 ...
-1
votes
3answers
938 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, ...
0
votes
1answer
619 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, i.e. Lineage OS without root full phone ...
1
vote
2answers
521 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? ...
1
vote
0answers
114 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 ...
0
votes
1answer
551 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 ...
1
vote
0answers
754 views

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

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
votes
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 ...
0
votes
1answer
626 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
votes
1answer
275 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? ...
3
votes
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
votes
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 ...
3
votes
1answer
623 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 ...
1
vote
2answers
431 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 ...
1
vote
2answers
389 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 ...
1
vote
2answers
70 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 ...
1
vote
1answer
111 views

How to change the displayed denomination in GreenBits Android wallet?

I just installed GreenBits, the native Java wallet from GreenAddress.it, on my Android device and transferred 0.1 BTC to the wallet. I like it so far. However, it displays my balance as 100,000 bits. ...
1
vote
0answers
73 views

C++ Proofofworklimit to bitcoinj util.DecodeCompactBits

What is equivalent bitcoinj util.DecodeCompactBits for below c++. Cbignum(~uint256(0) >>32) Cbignum(~uint256(0) >>20) Cbignum(~uint256(0) >>23) Cbignum(~uint256(0) >>22)
1
vote
2answers
1k views

C++ and secp256k1

I am working on a tiny C++ bitcoin application for a university project. I'm using Blockcypher API to create transactions, but I faced a problem with signing transaction's hash that returns one of the ...
1
vote
0answers
46 views

Verification exception : Unexpected

i have cloned litecoin wallet and edit it connect to the network we have created. I disabled checkoints, changed params and the block syncs for 32 blocks. Then i get the following error 05-26 13:07:...
2
votes
0answers
210 views

Editing bitcoinJ for Android Altcoin App

So there is an altcoin created by another party and i want to edit the bitcoin-wallet app for android so that it connects to the new network. Is it enough to edit core/params/MainNetParams.java in ...
1
vote
1answer
262 views

Connect to regnet from my WalletAppKit Android app

I'm developing a simple app to learn how to use the bitcoinj library. I'm using the WalletAppKit object to simplify the process and I'm following the official documentation. When developing I prefer ...
1
vote
1answer
2k views

I Restored My Phone Wallet and Now All My Coins Vanished

TL;DR: After creating a backup, I added a pin to my "Langerhans" Dogecoin wallet for android. Now, the pin doesn't get accepted (or I forgot it). Finally, I used the "Restore Backup" function and got: ...
1
vote
0answers
159 views

Getting Bitcoin address from Android Bitcoin wallets

In the android app that I am developing, I need to send a request to check if other Bitcoin apps exist on the user’s phone, and if that is the case, I need to get the user’s Bitcoin address from the ...
4
votes
2answers
453 views

What multi-sig wallets are there for Android/Jolla?

TL;DR: What wallet apps are there for android (or sailfishOS) that has "true" support for multisig? Requirements/rationale Thinking a bit, if I'm to possess serious amounts of bitcoins, I want a ...
2
votes
1answer
489 views

How to sign a transaction using BitcoinJ

I am having problem signing the transaction using BitcoinJ library without the Wallet instance, I only have the Transaction class instance and the ECKey in order to sign the transaction. Is there a ...
1
vote
0answers
129 views

Do we need in-app billing for bitcoin-like app?

Apps that use bitcoin contains transactions e.g. deal with a real money. Google says that if we deal with a real money, it has to go over their in-app billing service. I checked other bitcoin apps on ...
3
votes
1answer
285 views

Android BTC clients that remotely use my Bitcoin Core wallet?

Are there any Android BTC clients that remotely use my Bitcoin Core wallet so I don't have to use another wallet specific for my phone? I am running my own BTC node.