# Archive Assisted Archival Fixity Verification Framework

## TL;DR

This paper introduces two novel approaches, Atomic and Block, for verifying the integrity of archived web content without relying solely on archive-provided fixity information, enhancing trust and efficiency.

## Contribution

It proposes two new fixity verification methods that do not depend on archive-provided data, improving verification speed and reliability.

## Key findings

- Block approach verifies fixity 4.46 times faster than Atomic.
- Dissemination times vary significantly across archives, with archive.org taking longer.
- The methods enable fixity verification even without an Archival Fixity server.

## Abstract

The number of public and private web archives has increased, and we implicitly trust content delivered by these archives. Fixity is checked to ensure an archived resource has remained unaltered since the time it was captured. Some web archives do not allow users to access fixity information and, more importantly, even if fixity information is available, it is provided by the same archive from which the archived resources are requested. In this research, we propose two approaches, namely Atomic and Block, to establish and check fixity of archived resources. In the Atomic approach, the fixity information of each archived web page is stored in a JSON file (or a manifest), and published in a well-known web location (an Archival Fixity server) before it is disseminated to several on-demand web archives. In the Block approach, we first batch together fixity information of multiple archived pages in a single binary-searchable file (or a block) before it is published and disseminated to archives. In both approaches, the fixity information is not obtained directly from archives. Instead, we compute the fixity information (e.g., hash values) based on the playback of archived resources. One advantage of the Atomic approach is the ability to verify fixity of archived pages even with the absence of the Archival Fixity server. The Block approach requires pushing fewer resources into archives, and it performs fixity verification faster than the Atomic approach. On average, it takes about 1.25X, 4X, and 36X longer to disseminate a manifest to perma.cc, archive.org, and webcitation.org, respectively, than archive.is, while it takes 3.5X longer to disseminate a block to archive.org than perma.cc. The Block approach performs 4.46X faster than the Atomic approach on verifying the fixity of archived pages.