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What Blockstream Green is for

Blockstream Green is a Bitcoin wallet - it’s a way for you to securely receive, store, and send Bitcoin.

You can use Blockstream Green to accept incoming payments, keep your coins safe for long periods of time, and to make payments and send Bitcoin to others.

Our wallet allows for convenient, instant access to your coins from a variety of platforms through mutually compatible applications.

We offer a variety of advanced features, such as letting our users set their own spending limits, watch-only access for observers, and our unique multisig security model. All of these (and more) are explained in more detail below.

What Blockstream Green isn’t for

It is just as important to understand what Blockstream Green isn’t for.

Blockstream Green is not a platform for buying and selling bitcoin. If you wish to buy or sell bitcoin, you will need to use another method. After you have bought some Bitcoin, you can send it to your Blockstream Green wallet and receive it by using the wallet’s receive function.

Blockstream Green only supports Bitcoin (which is denoted by the 3-letter ticker ‘BTC’). We do not support any national currencies like USD or EUR. We do not support any other cryptocurrencies, such as Peercoin or Dogecoin. Attempting to send anything other than Bitcoin to an address generated by a Blockstream Green wallet can result in those coins being permanently lost. This is completely out of our control, and we are unable to provide support in this scenario. Before you send any coins to or from your Blockstream Green wallet, be sure that both the sender and receiver are using the cryptocurrency denoted by the ticker ‘BTC’.

Always be sure to check the 3-letter currency ticker before sending any coins, and only use BTC with your Blockstream Green wallet.

Platforms Supported

Blockstream Green is available for Android and iOS.

Testnet Versions

Bitcoin has an alternative network known as ‘testnet’. This testnet network is just like the real Bitcoin network (which is known as ‘mainnet’), but with worthless coins, so that people can test features and applications without the risk of losing real coins.

Our wallets can connect to testnet by selecting testnet from the list of networks in the settings of the login page. If you are new to Bitcoin or Blockstream Green, we urge you to try things out on testnet first, so that you can get comfortable with how things work before you start using your real coins.

Wallets, addresses, and coins on the Bitcoin Testnet are completely separate from the real Bitcoin network. As such, you will need to create and secure a new mainnet wallet after you are finished with testing and wish to use the real Bitcoin network. Trying to use an address, or login credentials, or mnemonic from a testnet wallet or service on the Bitcoin mainnet will not work.

You’re in Control

Bitcoin is an exciting new technology with many advantages, but it comes with some extra responsibilities on the users’ end. As a Bitcoin wallet provider, we at Blockstream Green do not actually grant access to your Bitcoin - you do.

We are a non-custodial wallet. We provide you with the tools to manage your coins. Even if we disappear, you still retain access to your Bitcoin. This is contrasted with a custodial service, which holds coins on behalf of its users.

In a custodial system, the service is solely responsible for securing users coins. Examples include a bank or cryptocurrency exchange that has a verification process for new users, and then receives, stores, and sends coins on their users’ behalf, as long as they can verify their identity. This kind of service can deny users access or confiscate their coins at their own discretion or as a result of pressure from authorities.

This is not possible with Blockstream Green, as we are a non-custodial service. Each user exclusively controls their own Bitcoin, and it’s not possible for Blockstream Green to unilaterally move your coins. As long as you follow the instructions provided, you remain in complete control of your coins, and are solely responsible for retaining access to them.

Because of this, there are some differences between our services and user responsibilities and more traditional financial tools and services. Be sure to read the Setting Up a Wallet section for details; pay close attention to the recommended practices outlined there.

We’re Free! (But Bitcoin Isn’t)

Blockstream Green is a completely free service - we do not earn any revenue from our users, we neither collect, nor use any of their data.

It is important to understand that all Bitcoin transactions require a fee that is built in as part of the Bitcoin protocol. This fee is paid to the miners who run expensive equipment to secure the Bitcoin network and confirm users’ transactions.

There is no benefit to Blockstream Green for our users to pay high fees, and we do our best to provide our users with tools and strategies to keep their fees low. At certain times, however, factors beyond our control can lead to high fees when sending Bitcoin.

We do not ever receive these fees, and so have no way to return any fees to users after a transaction has been confirmed. We always show the fee that a transaction will pay so you can verify or change it before you make your transaction.

What’s Special About Blockstream Green

For those that are already familiar with how Bitcoin wallets typically work, you may know about some of the convenience, security, and privacy features that using Bitcoin offers.

Thanks to our unique multi-signature format, we’re able to offer all the usual privacy and freedom of typical Bitcoin wallets, but with extra security.

We use a format that requires signatures generated by 2 different keys, one of which is controlled by you, and one of which is controlled by our service. The service will sign transactions as long as Two-Factor Authentication (2FA) confirmation – a one time password delivered to you ideally on a separate device via Google Authenticator, email, SMS or call – is given. This means that even if someone gets a hold of your mnemonic, they still can’t steal your coins when you have 2FA enabled, unless they also compromise your 2FA method.

The process also stays trust minimized - even if, for some reason, the service cannot sign your transaction, you can independently move your coins without the service after a chosen period of time has passed.

This gets you the best of both worlds - the full financial sovereignty and trustlessness of a non-custodial Bitcoin wallet along with the extra layer of server-enforced two factor security.

Our design enables a lot of cool features, many of which are not available in other wallets:

Convenience

  • Easy access from anywhere
  • All access controlled by a single user mnemonic
  • A simple interface with current prices in your national currency
  • Fast PIN login
  • Watch-only logins for quick balance and transaction checking
  • Easy key sweeping to import coins
  • User supplied transaction memos
  • Default or Custom Transaction Fees
  • Increase fees after sending to speed up confirmation
  • Segregated Witness support for the lowest fees possible
  • Testnet network for functionality trials

Security

  • Multiple two-factor authentication options
  • Blockstream Green signature required to move coins
  • User-Controlled transaction limits and restrictions
  • Hardware wallet support (on Andorid)

Privacy

  • No KYC or identification of users necessary
  • User secrets are never transmitted to our servers or stored unencrypted on your device
  • Minimal information is stored by the service
  • Optional PGP encryption for email privacy
  • Accessibility via Tor