Sharding is a promising approach to scale permissionless blockchains. In a sharded
blockchain, participants are split into groups, called shards, and each shard only executes …

The last decade witnessed the rise of permissionless blockchains. Requiring no prior
knowledge of the participants' identities, these decentralized systems are advocated as a …

Existing permissionless blockchain solutions rely on peer-to-peer propagation mechanisms,
where nodes in a network transfer transaction they received to their neighbors …

Blockchain technology has been successfully applied in many different application domains.
However, in some time-sensitive applications, eg, a COVID-19 tracking system with case …

For permissionless blockchains, scalability is paramount. While current technologies still fail
to address this problem fully, many research works propose sharding or other techniques …

The blockchain structure can be utilized in an efficient way to verify and ensure the integrity
of the data and prevent historical transactions from tampering, such that if one block is …

We consider a hierarchical structure of a permissioned blockchain with three types of
participant: providers, collectors, and governors. Providers forward transactions to collectors; …

Blockchain has attracted widespread attention from both academia and industry. It is
promising to establish a truly decentralized, transparent, and accountable environment …

Lightweight clients are gaining increasing adoption in existing blockchain deployments,
owing to their reduced resource consumption. There are currently a number of libraries that …