# What each data collection added, changed, and removed

Source: https://www.hydden.ai/features/change-summaries
Last updated: 2026-10-21

> Change summaries show what each Hydden data collection added, changed, and removed. Sign-in and encryption between nodes are stronger.

Hydden · Change summaries

Every data collection reports what changed since the previous one, including on systems that keep no log.

## Why it's important

Each data collection changes the identity record. The summary shows what that data collection added, changed, and removed, including on systems that keep no log of their own. Sign-in and encryption between nodes are stronger.

## The problems this feature solves

- Other products typically rely on snapshots. A snapshot is point-in-time: it only shows what existed at the moment it was taken, so whatever was added, changed or removed between snapshots is invisible.
- Some systems keep no log of their own. Between one data collection and the next, additions, changes, and removals have no event stream to record them.

## What the feature does

- Each data collection lists what was added, changed, and removed, including on systems that keep no log.
- Sign-in and encryption between nodes are stronger.

## Questions

What does a data collection summary show?

What that data collection added, changed, and removed.

What about systems that keep no log?

Hydden compares each data collection with the one before it, so the difference is still on the record.

What about sign-in and encryption between nodes?

Sign-in and encryption between nodes are stronger.

## Keep reading

- **Events** The identity changes themselves, in one feed. Read more
- **Product updates** Every release in Hydden, newest first. Read more
- **Discovery** How Hydden collects the systems those summaries describe. Read more

## See what each data collection changed

Request a trial and connect a system.

[Request a trial](https://www.hydden.ai/try-free) [Book a demo](https://www.hydden.ai/book-a-demo)