Mobile iOS

BULL by Bull Bitcoin

BULL is a privacy-focused Bitcoin wallet that combines features for experienced users with a simple interface for beginners, designed to keep self-custody accessible even in a high-fee environment. It serves as a companion app for many hardware wallets. Lightning payments are facilitated via Liquid Network swaps.

Features

Bech32

Bech32 is a special address format made possible by SegWit (see the feature description for SegWit for more info). This address format is also known as 'bc1 addresses'. Some Bitcoin wallets and services do not yet support sending or receiving to Bech32 addresses.
Hardware Wallet

Some wallets can pair and connect to a hardware wallet in addition to being able to send to them. While sending to a hardware wallet is something most all wallets can do, being able to pair with one is a unique feature. This feature enables you to be able to send and receive directly to and from a hardware wallet.
Legacy Addresses

Most wallets have the ability to send and receive with legacy bitcoin addresses. Legacy addresses start with 1 or 3 (as opposed to starting with bc1). Without legacy address support, you may not be able to receive bitcoin from older wallets or exchanges.
Lightning

Some wallets support transactions on the Lightning Network. The Lightning Network is new and somewhat experimental. It supports transferring bitcoin without having to record each transaction on the blockchain, resulting in faster transactions and lower fees.
SegWit

Some wallets support SegWit, which uses blockchain space more efficiently. This helps reduce fees paid by helping the Bitcoin network scale and sets the foundation for second layer solutions such as the Lightning Network.

Criteria

Control

Control over your money

Good

This wallet gives you full control over your bitcoins. This means no third party can freeze or lose your funds. You are however still responsible for securing and backing up your wallet.

Validation

Decentralized validation

Acceptable

This wallet connects to a random server from a list. This means some trust in third parties is required when verifying payments. However, it is not as secure as a full node like Bitcoin Core.

Transparency

Basic transparency

Acceptable

The developers of this wallet publish the source code for the client. This means any developer in the world can audit the code. However, you still need to trust developers of this wallet when installing or updating the final software because it was not built deterministically like Bitcoin Core.

Environment

Secure environment

Acceptable

This wallet is loaded on mobiles where apps are usually isolated. This provides a good protection against malware, although mobiles are usually easier to steal or lose. Encrypting your mobile and backing up your wallet can reduce that risk.

Privacy

Basic privacy

Acceptable

Prevents spying on your payments

Acceptable

This wallet makes it harder to spy on your balance and payments by rotating addresses. You should still take care to use a new Bitcoin address each time you request payment.

Discloses information to a third party

Caution

This wallet uses central servers which are able to associate your payments together and log your IP address.

Tor can be used

Acceptable

This wallet lets you setup and use Tor as a proxy to prevent attackers or Internet service providers from associating your payments with your IP address.

Fees

Full control over fees

Good

This wallet gives you full control over fees. This means that this wallet allows changing the fees after funds are sent using RBF or CPFP. This wallet also provides fee suggestions based on current network conditions so that your transactions are confirmed in a timely manner without paying more than you have to.

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