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---
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2021-09-13 09:23:46 +00:00
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summary: "Monero's efficient way of building ring signatures"
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terms: ["CLSAG"]
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---
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{% include disclaimer.html translated="no" translationOutdated="no" %}
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2021-09-13 09:23:46 +00:00
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CLSAG (Concise Linkable Spontaneous Anonymous Group) signature are the new
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way Monero builds @ring-signatures, which replaces MLSAG (multilayered
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Linkable Spontaneous Anonymous Group Signature). CLSAG will go live and
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mandatory with the [Monero network upgrade of October 2020]({{ site.baseurl
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}}/2020/08/18/network-upgrade-october-2020.html). CLSAG maintains the same
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functionalities as MLSAG, but with the advantage of considerable size
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savings for @transactions and improvements in verification speed. This new
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technology was developed by contributors of the [Monero Research Lab]({{
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site.baseurl }}/resources/research-lab/) and [audited by external
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researchers]({{ site.baseurl_root
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}}/resources/research-lab/audits/clsag.pdf).
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With CLSAG, users see a 20% improvement in signature verification, and at
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least a 10% overall improvement for typical transactions. For example, a
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typical Monero transaction (2 inputs and 2 outputs) which usually weighs
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2.5kB, takes only 1.9kB of blockchain space with CLSAG, a ~25% improvement.
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---
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##### Other Resources
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<sub>1. [Announcement of CLSAG audit's result and overview of the technology]({{ site.baseurl }}/2020/07/31/clsag-audit.html)</sub><br>
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<sub>1. [CLSAG preprint](https://eprint.iacr.org/2019/654)</sub>
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