Sia is a decentralized storage platform secured by blockchain technology. The Sia Storage Platform leverages underutilized hard drive capacity around the world to create a data storage marketplace that is more reliable and lower cost than traditional cloud storage providers.

We present HotStuff, a leader-based Byzantine fault-tolerant replication protocol for the partially synchronous model.

Once network communication becomes synchronous, HotStuff enables a correct leader to drive the protocol to consensus at the pace of actual (vs. maximum) network delay--a property called responsiveness--and with communication complexity that is linear in the number of replicas. To our knowledge, HotStuff is the first partially synchronous BFT replication protocol exhibiting these combined properties. HotStuff is built around a novel framework that forms a bridge between classical BFT foundations and blockchains. It allows the expression of other known protocols (DLS, PBFT, Tendermint, Casper), and ours, in a common framework.

Our deployment of HotStuff over a network with over 100 replicas achieves throughput and latency comparable to that of BFT-SMaRt, while enjoying linear communication footprint during leader failover (vs. quadratic with BFT-SMaRt).

The Hyperledger project aims to create frameworks for individuals and companies to create shared as well as closed blockchains.

The easiest way to start building decentralized blockchain apps.

• Get paid mining rewards if you build a popular app.
• Scale your app without limitations of the blockchain.
• Gain a competitive advantage by giving your users data ownership.

The second article in our series on privacycoins looks at Monero. One of the oldest privacycoins on the market, it's based on the innovative CryptoNote protocol first used by Bytecoin.

Mastering Bitcoin is a book for developers, although the first two chapters cover bitcoin at a level that is also approachable to non-programmers. Anyone with a basic understanding of technology can read the first two chapters to get a great understanding of bitcoin.

How to set up a private ethereum blockchain using open-source tools and a look at some markets and industries where blockchain technologies can add value.

By now, you have likely heard words like "bitcoin" and "blockchain," perhaps even "Ethereum," and wondered what they all mean.

Do they refer to something useful, and if so, how would you go about using it?

This article is intended to put meaning behind these words and others, by highlighting one instance of the technology behind the concepts.

(Sequel here: Blockchain is not only crappy technology but a bad vision for the future.)

Industry 4.0 is powered by the fusion of technologies that are connecting the dots between the physical, digital and biological spheres.

The Ethereum Wiki

The first Bitcoin paper was first released in 2008. My excitement about the potential of blockchain technology has been building ever…

Have you heard of the Bitcoin Lightning Network? It is a proposal that claims that:

To process a transaction, you need first to make sure the sender owns the asset he wants to transfer, and make sure he will not trade it twice.

In the blockchain, information is stored in blocks that record all transactions ever done through the network. Hence, it allows validating both the existence of assets to be traded and ownership.

To avoid double spending, the technology requests several nodes to agree on a transaction to process it. A validation is also artificially difficult to achieve: miners leverage computer power to solve complex cryptographic problems (the proof-of-work). Every time a problem is cracked, a block is added to the chain, and all the transactions it includes are thus validated. The updated chain, including the new block, is shared with other nodes and becomes the new reference; this process leverages cryptography to prevent duplicate transactions.