Research profile

I aim at improving scalability, security and privacy of permissionless blockchains and cryptocurrencies.
My research mainly combines techniques from cryptography and distributed computing.

[Google scholar] [DBLP]

Since Babylon

At Babylon, I have been focusing on designing and implementing the Babylon system. Nevertheless, I'm still trying to do blockchain research at my spare time.
My current research interest includes inventing new protocols atop Bitcoin, security sharing protocols, and consensus protocols with new security properties.

• Constant latency and finality for dynamically available DAG
  Hans Schmiedel, Runchao Han, Qiang Tang, Ron Steinfeld, and Jiangshan Yu
  The 46th IEEE Symposium on Security and Privacy (SP 2025)
  [Paper]
  Modeling Mobile Crash in Byzantine Consensus
  Hans Schmiedel, Runchao Han, Qiang Tang, Ron Steinfeld, and Jiangshan Yu
  The 37th IEEE Computer Security Foundations Symposium (CSF 2024)
  [Paper]
• Interchain Timestamping for Mesh Security
  Ertem Nusret Tas, Runchao Han, David Tse, Fisher Yu, and Kamilla Nazirkhanova
  ACM Conference on Computer and Communications Security (CCS 2023)
  [Paper]
• EBFT: Simplifying BFT Consensus Through Egalitarianism
  Jianyu Niu*, Runchao Han*, Shengqi Liu, Fangyu Gai, Ivan Beschastnikh, Yinqian Zhang, and Chen Feng
  [Paper] [Variant used in VeChain]

At Monash

During my PhD, my research mainly focused on blockchain sharding protocols and their underlying primitives, such as shard allocation and decentralised randomness beacon.
I also have worked on some other topics such as cross-chain communication, economic security of blockchains, layer-2 protocols, and optimisation of Proof-of-Work mining.

• Fair Delivery of Decentralised Randomness Beacon
  Runchao Han and Jiangshan Yu
  The 27th International Conference on Financial Cryptography and Data Security (FC 2023)
  [Paper]
• Analysing and Improving Shard Allocation Protocols for Sharded Blockchains
  Runchao Han, Jiangshan Yu, and Ren Zhang
  The 4th ACM Conference on Advances in Financial Technologies (AFT 2022)
  [Paper] [Selected as "Paper of the Week" (Issue #68) by ZK Capital]
• On the optionality and fairness of Atomic Swaps
  Runchao Han, Haoyu Lin, and Jiangshan Yu
  The First ACM Conference on Advances in Financial Technologies (AFT 2019)
  [Paper] [Slides] [Code] [EIP-2266 standard] [Peep an EIP #23] [Report from CryptoNews] [Report from Monash University]
• Evaluating Technical Approaches Toward A National Digital Ledger
  Carsten Rudolph, Jiangshan Yu, James Boorman, and Runchao Han
  Technical report for the Ministry of Justice, Communication and Foreign Affairs of Tuvalu
  [Link]