# Trustchain -- Trustworthy Decentralised Public Key Infrastructure for Digital Credentials

arXiv: https://arxiv.org/abs/2305.08533 · HTML: https://mlsanity.com/paper/2305.08533/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 15 May 2023.

## Built on by (most cited first, 1 of 1)

- [A Self-Supervised Framework for Space Object Behaviour Characterisation](https://mlsanity.com/paper/2504.06176/) (2025)

## Abstract (arXiv)

The sharing of public key information is central to the digital credential security model, but the existing Web PKI with its opaque Certification Authorities and synthetic attestations serves a very different purpose. We propose a new approach to decentralised public key infrastructure, designed for digital identity, in which connections between legal entities that are represented digitally correspond to genuine, pre-existing relationships between recognisable institutions. In this scenario, users can judge for themselves the level of trust they are willing to place in a given chain of attestations. Our proposal includes a novel mechanism for establishing a root of trust in a decentralised setting via independently-verifiable timestamping. We also present a reference implementation built on open networks, protocols and standards. The system has minimal setup costs and is freely available for any community to adopt as a digital public good.