# \[ANN\] Tendermint KMS v0.8: Tendermint v0.33 support

**URL:** <https://forum.cosmos.network/t/ann-tendermint-kms-v0-8-tendermint-v0-33-support/3704>\
**Category:** Validation\
**Created:** [June 9, 2020, 1:54am UTC](https://forum.cosmos.network/t/ann-tendermint-kms-v0-8-tendermint-v0-33-support/3704 "2020-06-09T01:54:54Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![iqlusion](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.cosmos.network/iqlusion/32/294_2.png) [@iqlusion](https://forum.cosmos.network/u/iqlusion)\
**Post date:** [June 9, 2020, 1:54am UTC](https://forum.cosmos.network/t/ann-tendermint-kms-v0-8-tendermint-v0-33-support/3704/1 "2020-06-09T01:54:54Z")

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[Tendermint Key Management System (KMS)](https://github.com/iqlusioninc/kms/), a.k.a. `tmkms`, is a signature service with support for Hardware Security Modules (HSMs), such as [YubiHSM2](https://www.yubico.com/products/yubihsm/) and [Ledger Nano S](https://www.ledger.com/products/ledger-nano-s). It’s intended to be run alongside Cosmos Validators, ideally on separate physical hosts, providing defense-in-depth for online validator signing keys, double signing protection, and functioning as a central signing service that can be used when operating multiple validators in several Cosmos Zones.

We’ve just released a [v0.8.0-alpha1](https://github.com/iqlusioninc/tmkms/pull/63) with initial support for Tendermint v0.33, which can be used simultaneously in conjunction with pre-Tendermint v0.33 chains (e.g. `cosmoshub-3`, `columbus-3`) by toggling a configuration option. See the example config file for the notation:

> <https://github.com/iqlusioninc/tmkms/blob/6a147e5/tmkms.toml.example#L32>

We’re presently running the v0.8.0-alpha1 release in production (albeit with the “legacy” support) and are looking for more people to do initial testing on Tendermint v0.33 chains before we cut a final release.

Please try it out and let us know!

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**Author:** ![mattharrop](https://avatars.discourse-cdn.com/v4/letter/m/58956e/32.png) [@mattharrop](https://forum.cosmos.network/u/mattharrop)\
**Post date:** [June 9, 2020, 10:52am UTC](https://forum.cosmos.network/t/ann-tendermint-kms-v0-8-tendermint-v0-33-support/3704/2 "2020-06-09T10:52:17Z")

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Running at figment on legacy chains.

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<div class="post-metadata">

**Author:** ![iqlusion](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.cosmos.network/iqlusion/32/294_2.png) [@iqlusion](https://forum.cosmos.network/u/iqlusion)\
**Post date:** [June 25, 2020, 8:54pm UTC](https://forum.cosmos.network/t/ann-tendermint-kms-v0-8-tendermint-v0-33-support/3704/3 "2020-06-25T20:54:18Z")

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We’ve just published a v0.8.0-rc0 release which includes some exciting new features we intend to announce after a final v0.8.0 release.

In the meantime, we’d love any feedback on this RC before a final release. We’re presently running it in production on `cosmoshub-3` and `columbus-3`.

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<div class="post-metadata">

**Author:** ![iqlusion](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.cosmos.network/iqlusion/32/294_2.png) [@iqlusion](https://forum.cosmos.network/u/iqlusion)\
**Post date:** [July 6, 2020, 4:41pm UTC](https://forum.cosmos.network/t/ann-tendermint-kms-v0-8-tendermint-v0-33-support/3704/4 "2020-07-06T16:41:23Z")

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tmkms v0.8.0 final is out. You can read the release announcement here:

> **[Announcing Tendermint KMS v0.8.0: transaction signing support, Tendermint...](https://iqlusion.blog/announcing-tendermint-kms-v0-8-0-transaction-signing-support)**
>
> By Tony Arcieri The iqlusion team has just released a new version of Tendermint KMS (tmkms): v0.8.0. Tendermint KMS is a signature service with support for Hardware Security Modules (HSMs), such as YubiHSM2 and Ledger Nano . It’s intended to be... |...