Blockchain represents a new paradigm for digital interactions and serves as the underlying technology for most cryptocurrencies.
A blockchain is a collaborative, tamper-resistant ledger that maintains transactional records. The transactional records (data) are grouped into blocks. A block is connected to the previous one by including a unique identifier that is based on the previous block’s data. As a result, if the data is changed in one block, it’s unique identifier changes, which can be seen in every subsequent block (providing tamper evidence). This domino effect allows all users within the blockchain to know if a previous block’s data has been tampered with. Since a blockchain network is difficult to alter or destroy, it provides a resilient method of collaborative record keeping.
NIST researchers have been investigating blockchain technologies at multiple levels: from use cases, applications and existing services, to protocols, security guarantees, and cryptographic mechanisms. Research outcomes include scientific papers and the production of software for experimentation as well as providing direction for other NIST endeavors in this space. Blockchain has the potential to be implemented in many different systems, to include manufacturing supply chains, data registries, digital identification, and records management.
Enhanced Distributed Ledger Technology
Point of Contact: D. Richard Kuhn
Summary: The Enhanced Distributed Ledger Technology project examines the traditional blockchain data structure and seeks to create a new data structure (the block matrix) to provide high reliability, and security while also enabling deletion or updating capabilities not currently found in most blockchain systems.