Introducing the V2 Receive Payments API

We’re excited to announce a major upgrade to our Receive Payments API, which introduces a seamless and direct way for merchants to process customer transactions, and instantly receive payments. This new version of our Receive Payments API provides major improvements to:

  • Transaction speed
  • Security
  • Scalability
  • The merchant experience – simpler, more powerful and stable

How does it work?

This API uses HD (Hierarchical Deterministic) addresses, which are generated from an xPub. This allows anyone with access to the xPub to create new addresses from a seed in a reproducible way. The API can directly generate the addresses for you that belong to your xPub.  

The easiest way to obtain an xPub is to open a Blockchain Wallet at You can also use any other HD-compatible wallet, like MultiBit.

Once you provide your xPub, we also need a callback URL (your store website) which will be notified when a payment is received to an address derived from your xPub. You will be notified of the:

  • address
  • transaction_hash
  • value
  • confirmations (instantly when someone pays, and then a notification for every confirmation thereafter, up to 1000 confirmations)

How do I get started with the new API?

The process to get started is exactly the same, whether you’re new to our API, or you’re an existing user of our legacy Receive Payments API. After you’ve created a new Blockchain wallet at, follow these steps:

  1. Request an API key at
  2. Export your xPub from our alpha wallet by going to Settings -> Accounts & Addresses -> Show xPub.
  3. Use your API key, the xPub, and your callback URL to create payment requests.

Do I need to migrate to the new API?

In two weeks, we will begin phasing out the first version of the receive payments API, so please start using the new one before December 7th 2015.

What if I need assistance?

Our API documentation can guide you through all of the details. We’re always here to help, so if you can’t find the answer to your question, drop us a message anytime at

Merchant Spotlight – Churrasqueira Bairra


If you’re scrambling for dining options in Nassau County soon and want to support a Bitcoin accepting restaurant, Churrasqueira Bairrada Rodizio Restaurant is calling your name!  Founded in 1992 by Manuel Carvalho, the all-you-can-eat Portuguese-style barbecue spot quickly captured the attention of The New York Times, earning rave reviews and a frenetic following that continues to this day.

Famed for its chicken, its spirited atmosphere and celebrity sightings, Churrasqueira is a source of pride for Mineola’s large Portuguese population and a staple for anyone that loves classic latin and Portuguese cuisine.

Continue reading for my chat with Hector Fonseca, General Manager, on wood-charcoal, endless barbecue, and bitcoin.

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Bitcoin News for the week of 11/16/15

Welcome to our weekly bitcoin news recap, where we cover top headlines and stories in the world of bitcoin each week. On Monday we released our updated and improved receive payments API, which developers can start building on right now. In other exciting headlines, we wrapped up the HackPrinceton event, which was a blast! This week a spotlight was shone on bitcoin and philanthropy; a subject we hold close to our hearts. In a shift of focus, we can see from a high level that bitcoin is still a hot topic for many around the world, and continues to capture the imagination of many.

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HackPrinceton recap + Congrats to 1st place winner CommPound!

Logo via HackPrinceton

Undergrad and graduate students from all over the world came together last weekend to participate in HackPrinceton, which took place on Princeton University‘s main campus. The event was 36 intense hours, and included a variety of team and skill building activities.

As one of Princeton’s largest hackathons yet, the event attracted over 600 students and produced some of the “most impressive projects [they’ve] seen to date,” according to Zachary Liu and the HackPrinceton team. HackPrinceton welcomed experienced participants, as well as those who had never attended a prior hackathon.

An impressive 72 projects were submitted, and there were top 3 awards in both hardware and software categories. My personal favourite part about hackathon recaps is being able to review all the amazing submissions after the event is over. If you enjoy that as well, check out HackPrinceton’s DevPost page.

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Using the Blockchain API to determine the time left until the next bitcoin block halving

Countdown clock image via Tony Webster/Wikimedia
Countdown clock image via Tony Webster/Wikimedia

Earlier this year, we did a featured spotlight on a bitcoin developer Kyle Honeycutt who does tutorials focused on helping explain how to build exciting new tools leveraging the Blockchain suite of services, including our API.

Kyle has impressed us again, by coming up with a novel way to calculate the amount of time left until the bitcoin block reward halving happens in real-time. For those unfamiliar with the bitcoin halving, here is a quick explanation pulled from our 10 commonly used bitcoin terms article.

Bitcoins have a finite supply, which makes them scarce. The total amount that will ever be issued is 21 million. The number of bitcoins generated per block is decreased 50% every four years. This is called “halving.” The final halving will take place in the year 2140.

If you’d like a deeper understanding of the bitcoin halving, you can read Block Reward Halving: A Guide written by Vitalik Buterin, who is the founder of Ethereum. There is also another more recent article which talks about the different aspects of the bitcoin halving which is a good read.

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Announcing our new Receive Payments API

Today, we’re announcing the beta release of our Receive Payments API V2. We will be writing a full work up soon, but anyone interested in giving it a try can do so now. 

Receive Payments API V2
What do you need to know?

To begin with, you’ll need to have a BIP 32 account xPub. You can use any HD wallet or give our alpha wallet a go, and after creating your new wallet, follow the steps below:

  1. Create a new account inside the wallet exclusively for the API and show the xPub
  2. Request an API key for this API here 
  3. Use your xPub, API key, and your callback URL to create payment requests

What if I need assistance?

Our support documentation can guide you through all of the details. If you still need help, you are more than welcome to contact our developer support at


Bitcoin News for the week of 11/9/15

Welcome to our weekly bitcoin news recap, where we cover top headlines and stories in the world of bitcoin each week. In an interesting news bite, we saw bitcoin’s inventor, Satoshi Nakamoto, was nominated for the Nobel Memorial Prize in Economic Sciences. It’s another sign of increasing legitimacy for bitcoin, which shows that people globally appreciate its enduring contributions to computer science. We also see that financial institutions are persistent on embracing bitcoin and blockchain tech, applying them in different ways to fit their business models and platforms; bitcoin is disrupting. There is even more good news, which you can get by reading on in this week’s bitcoin news recap.

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Merchant Spotlight – Glory Cycles


Home to Glory Cycles, Greenville, South Carolina offers traditional southern charm, stunning natural beauty, and the coolest cycling towns on the East Coast to create one of America’s hottest emerging destinations and fastest growing cities.  Among the quaint shops, boutiques, and fabulous restaurants to a world-class collection of museums, galleries, and theaters to some of the most beautiful lakes, rivers and mountains in the world, Greenville is everything they say it is and more.

Today, Clive de Sousa and his team at Glory Cycles, play host to all kinds of customers in the showroom, on the web, and via phone.  The team is a part of the interconnectedness of the web and the information that flows freely and quickly.  What makes Glory Cycles so unique is the blending of web power, bitcoin technology, and local bike shop service into daily operations.  Read on to find out for yourself why Greenville is not just any Greenville with bitcoin-accepting Team Glory Cycles!

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Bitcoin News for the week of 11/2/15

Welcome to our weekly bitcoin news recap, where we cover top headlines and stories in the world of bitcoin each week. This past week was one of the more exciting weeks in bitcoin, as the price fluctuations caused quite the stir globally renewing media interest in bitcoin. Outside of the price spikes, we saw more good news as reports continue to show positive growth in both venture capital and user growth as the year comes to a close. Get all this news and more, in our weekly rundown.

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Merchant Spotlight – FLAT 128


You might ask, Why London?  On Monday’s Merchant Spotlight, we featured Westland Coffee as Team Blockchain’s favorite coffee joint in East London.  If you couldn’t tell already, London is home to Blockchain’s European HQ!

On today’s Merchant Spotlight, we continue to celebrate our love for London by featuring Elizabeth DuBois and her British-inspired luxury lifestyle boutique.  Among many accomplishments, Elizabeth launched the first bitcoin ATM in New York City and got a huge amount of press, notably from TechCrunch that covered the story!  At FLAT 128, Elizabeth combines her passion for fashion, business, and British design. Stop by 15 Christopher Street to shop hard-to-find and exclusive jewelry, accessories, and home decorall with bitcoin.  Chances are you may have never heard of the many brands as they are new to the USA and New York.

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