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8 votes
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Where is the Mycelium wallet file stored?

For Mycelium, the actual file that contains the encrypted keys are in the sqlite3 file. You can see in the source code that though there is in-memory storage, it's used mostly for testing and that the ...
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  • 7,639
5 votes
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How do custodial lightning wallets work?

I am sorry to say but your understanding is wrong. When you send x btc to Bluewallet you don't open a channel. You just give them your Bitcoin. Bluewallet and other custodial wallets run one (or ...
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4 votes

convert 12 word seed into 24 word seed

This is not possible. The mnemonic words are an encoding of the entropy used in the seed, essentially. A 12 word seed has less entropy than a 24 word one, so you cannot get 24 words out of it. ...
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  • 16.5k
4 votes

ECDSA signature with r value of 31?

This is valid, and there are even smaller types as well. Be aware that Bitcoin no longer really uses ASN.1 DER, but a even more restrictive subset of it. ASN.1 itself as it turns out is not ...
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  • 15.1k
3 votes
Accepted

Full block chain on a mobile phone

There are two types of wallets: Full Node A full node client uses the peer-to-peer network to validate transactions and blocks and to relay information to other peers. To verify all transactions, ...
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  • 1,281
3 votes
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Claim Bitcoin cash from android bitcoin app

The Bitcoin Wallet project recently included detailed instructions on how to extract your key pairs for exactly this purpose. In the section Recovering from protobuf wallet format, skip to the ...
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  • 160
3 votes
Accepted

C++ and secp256k1

Maybe libsecp256k1, which is what Bitcoin Core itself uses. Not sure about Android usability, but it compiles on many architectures.
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  • 6,208
3 votes
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Official or default Bitcoin wallet for Android

I don't think the Bitcoin Foundation or any similar authority has designated an official or preferred Android app, not in the same way that Bitcoin Core is the "official" desktop client because it is ...
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2 votes

How can I watch an address on Windows and Android?

Just use bitcoind -walletnotify= Execute command when a wallet transaction changes (%s in cmd is replaced by TxID) in a script or for more details, access the bitcoind API via RPC https://en....
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  • 51
2 votes

I Restored My Phone Wallet and Now All My Coins Vanished

The main issue seems to be a misunderstanding of this message: "Synchronizing with network, 6 weeks behind." This indicates that your wallet will be processing transaction data of the last six ...
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  • 64.4k
2 votes

Create Android Alt Coin Wallet

Lightweight wallets use a simplified payment verification (SPV) mode which only requires them to download part of the blockchain so yes a full node is required,yes you can clone an existing opensource ...
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  • 42
2 votes

Are there any POS coin open source mobile wallets implementations?

AFAIU, PoS is considered flawed by large parts of the cryptocurrency community. I've not kept abreast of POS coins, but some that I could think of are Peercoin, NXT and Blackcoin, which are currently ...
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  • 64.4k
2 votes

Claim Bitcoin cash from android bitcoin app

I have the same issue. I used OpenSSL to decrypt the file, gave the correct password and got org.bitcoin.production followed by a load of protobuf-serialized gibberish. I then processed the output ...
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  • 21
2 votes

Using a dedicated phone as "hardware wallet"

If your end goal is to wipe an old mobile phone to use exclusively as a cheap hardware wallet, I'd consider a Raspberry Pi. They can even be flashed to work exclusively as a Trezor device and can be ...
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2 votes
Accepted

Using a dedicated phone as "hardware wallet"

Is a comparable level of security achievable with an Android device with full phone encryption? Short answer: No. This doesn't mean an Android device is bad, there are less secure ways to store ...
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  • 17.4k
2 votes
Accepted

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

But How can I get the incoming Bitcoin Transaction Details which are perform out side my wallet? Unless you are using bitcoin-core wallet (e.g. listreceivedbyaddress), there isn't a way to query ...
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  • 7,090
2 votes

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

but is it safe to say my portfolio is lost if the developers don't restore the program We can categorise wallets into two major types Custodial Non-custodial A Custodial wallet is where some ...
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1 vote

Full block chain on a mobile phone

There is a full node for Android. It is a wrapped version of Bitcoin Core maintained by the Greenaddress founder. You can find it here: Android Bitcoin Core If you run it in blocks-only and pruned ...
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  • 64.4k
1 vote

How to track multiple bitcoin addresses?

Electrum software (https://electrum.org/) has a watch-only function that can be used to track any public addresses, which should fit your needs. Also note that Electrum allows you to generate and ...
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  • 294
1 vote

How to track multiple bitcoin addresses?

usually you can use block explorers to display amounts of your different bitcoin addresses. I tend to go to "blockchain.info". As it is cumbersome to cut and paste everytime, I created a small (Linux/...
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  • 5,026
1 vote

Claim Bitcoin cash from android bitcoin app

Knowing your private key you can transfer/sweep your Bitcoin Cash funds into a offline wallet like Coinomi and then transfer them to an exchange. More on the process of sweeping your funds is at How ...
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  • 166
1 vote

WalletAppKit creates an address every time Bitcoinj gets initialized

According to the documentation: getImportedKeys() returns a list of the non-deterministic keys that have been imported into the wallet, or the empty list if none. Try to change: if (wallet()....
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  • 11
1 vote

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

I found another Android app called "Bitcoin Wallet" that let me "sweep" the paper wallet into another address. Everything is fine.
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1 vote

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

It's not possible to answer this question without knowing what's wrong with the phone. Your best bet might visiting a repair shop. Tell them you need the data on that phone.
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  • 539
1 vote

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

This is definitely possible. If your application is running as root, it can access the wallet files of Bitcoin wallets, which usually have fixed filenames and file headers. The downside of this ...
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  • 28.7k
1 vote

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

It is not possible, by design. Like Jestin said, the wallet's balance is not the business of other apps.
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  • 539
1 vote
Accepted

Removing Bitcoin from my phone to secure storage

You are overthinking this. The easiest way to move some of your bitcoin to a different wallet is simply to send it to an address belonging to the second wallet. This works, regardless of what type ...
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  • 8,734
1 vote
Accepted

How to change the displayed denomination in GreenBits Android wallet?

On the top right corner of GreenBits there's a menu with a number of entries: the first one is named "Settings" and we should select that, then "Info & settings" and then you can change the fiat ...
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