Understanding the Bitcoin Blockchain Header

The composition of the block header is an intricate and highly consequential…

How Zk-Rollups Work

Scaling Ethereum with Zero-Knowledge Proofs

Background

Implementing Digital Signatures in Rust

In-depth walk-through of implementing ECDSA in Rust with code…

Vaulted Bitcoin Custody

We describe Bitcoin transactions, restricted transactions called Covenants, and our own research into secure Bitcoin…

Mental Models of Money and Lightning

Lightning is not a silver bullet, but it will significantly aid in the utility of Bitcoin and…

FCAT Blockchain Incubator, Who We Are

At Fidelity, we have been researching and advancing the blockchain ecosystem since 2014…