Innovative consensus and scalable protocol for massive adoption

What is Alephium?

Alephium is a high-throughput public blockchain platform that could scale to ten thousands of transactions per second without sacrificing decentralization and security. The platform is built on its innovative sharding algorithm called BlockFlow. BlockFlow exploits a scalable UTXO model, combining DAG and sharding, to be the first sharding algorithm supporting cross-shard transactions natively. Alephium also designs a practical and scalable solution for decentralized applications.


Innovative sharding algorithm supports cross-shard transactions natively for the first time


Platform runs in an open, permission-less network securely, like Bitcoin, only vulnerable to 51% attack


Viable and efficient solutions for scaling smart contract and for confidential transactions


Alephium is simple, efficient, secure and practical compared to other sharding projects. Its core sharding algorithm BlockFlow has the same minimal network assumptions as Bitcoin. The user experience of Alephium would be the same as single blockchain, thanks to its native cross-shard transactions. Alephium is a permissionless decentralized platform, everyone could contribute to the consensus of its network. The elegant design of BlockFlow enables us to implement Alephium much quicker than other projects.

Alephium’s consensus is one of the core parts of its BlockFlow algorithm. BlockFlow exploits a DAG data structure to resolve its shard dependencies and then uses a finality algorithm to achieve consensus for all shards. The finality algorithm could be PoW, PoS or any other finality algorithm. Alephium adopts PoW for the moment as it’s decentralized and secure and has been tested by time with Bitcoin.

BlockFlow exploits a DAG data structure to resolve its shard dependencies. As a result, mining works from all shards are accumulated into every new block. If an attacker wants to reorg a block in one shard, he must attack the blocks on the other shards that depend on this block. Therefore, Alephium is vulnerable to 51% attack.

Alephium’s efficient and practical approach to DApps is to combine our token protocol, data protocol, and smart contracts. Token protocol and data protocol are naturally scaled to all shards. We support smart contracts in some of the shards called intra-group shards. DApps could benefit very much from our native cross-shard transactions without sacrificing the power of smart contracts.



Cheng Wang

Founder, R&D

Proposed the first linear time asynchronous Byzantine agreement algorithm (link).

Alois Cochard

Co-founder, CTO

Former CTO of Bestmile SA. Functional hacker.

Eric Zhou


Co-Founder & Former COO of FClassroom

Peng Cui

Marketing & Operations

Fund Manager at Cybernaut (China) Investment

Frederic Peng

Marketing & Operations

Vice-president of Blockchain Association of Tsinghua Students


Casey Detrio

Ethereum Core Developer

Eth 1.x roadmap (link)
Eth 2 "Phase one and done (link)

Johannes Schweifer

CoreLedger CEO

Co-Founder of Bitcoin Suisse AG

Peng Liu

IFlyTek Vice President

Computational Advertising Expert


2018 Q2 - Q4

The Alpha version including the core BlockFlow algorithm was implemented. Alpha version tested on AWS achieving > 10K TPS (Demo).

2019 Q1 - Q3

Alephium's testnet 1.0 will be released with beta applications for participants.


2019 Q4 - 2020 Q1

The testnet would be further enhanced with performance, security, and protocol improments.

After Pre-A Funding

The initial main net will be released.