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matrix-spec-proposals/content/rooms/v5.md

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---
title: Room Version 5
type: docs
weight: 50
---
This room version builds on [version 4](/rooms/v4) while enforcing signing
key validity periods for events.
## Client considerations
There are no client considerations introduced in this room version. Clients
which implement the redaction algorithm locally should refer to the
[redactions](#redactions) section below for a full overview of the algorithm.
## Server implementation components
{{% boxes/warning %}}
The information contained in this section is strictly for server
implementors. Applications which use the Client-Server API are generally
unaffected by the intricacies contained here. The section above
regarding client considerations is the resource that Client-Server API
use cases should reference.
{{% /boxes/warning %}}
Room version 5 uses the same algorithms defined in [room version
4](/rooms/v4), ensuring that signing key validity is respected.
### Signing key validity period
{{% rver-fragment name="v5-signing-requirements" %}}
## Unchanged from v4
The following sections have not been modified since v4, but are included for
completeness.
### Redactions
{{% rver-fragment name="v1-redactions" %}}
### Handling redactions
{{% rver-fragment name="v3-handling-redactions" %}}
### Event IDs
{{% rver-fragment name="v4-event-ids" %}}
### Event format
{{% rver-fragment name="v4-event-format" %}}
### Authorization rules
{{% rver-fragment name="v3-auth-rules" %}}
### State resolution
{{% rver-fragment name="v2-state-res" %}}
### Canonical JSON
{{% rver-fragment name="v1-canonical-json" %}}