Cryptocurrency Polkadot (DOT), second audit validated by Quarkslab

Indeed, the company Quarkslab completes the second audit of the cross-chain messaging format XCMv2 of the Polkadot blockchain. The purpose of the current check was to detect possible security or fairness issues between the channels. This includes denial of service or DoS, logic errors, destruction or improper keystroke as well as locking and unlocking on both channels. The previous verification had been carried out by SRLabs.

Polkadot Announces Successful Second Quarkslab Company Audit

The Cross-Consensus by Polkadot

XCM, Cross-Consensus Messaging format is a consensual cross-chain communication system used by the Polkadot blockchain. XCM, cross-chain messaging format provides the base utility for all of the technologies that form the Polkadot ecosystem. It allows transparent communication between the blockchain, the tools (Subtrate execution mode) as well as the smart contracts (the blocks of codes like SPREE as well as the bridge). XCM fulfills Polkadot’s primary goal of being an interoperable and functional multi-chain ecosystem. Indeed, XCM can be used to communicate between blockchains thanks to different consensus systems. This even between heterogeneous ecosystems like Polkadot and Ethereum.

Having a common email format expands the reach of projects in the Polkadot ecosystem and Substrate. This provides a solid foundation for the future of Web3 through cross-chain communication. Indeed, it provides a functionality allowing the connection between blockchains and decentralized applications (DApps) which do not necessarily operate under the same consensus rules and the same technology.

The XCMv2 audit, the cornerstone of the Polkadot ecosystem

XCMv2deployed first on Kusama, the little sister of Polkadot, has just been audited for the second time and is now ready to go into production. Because of the reach of consensus messaging for the Polkadot Network, it is important that every XCM interaction undergoes independent external security review.

In general, bridges and technologies cross-chain will play a vital role in the months or years to come in interconnecting blockchains that do not necessarily work with the same technology or the same consensus rules. Among these are Hop for EVM blockchains, Interlay for Bitcoin bridge to Polkadot or Axelar Network. This aims to bridge the multiple technologies blockchain. XCM pursues the same goal by seeking to bridge any kind of consensus in the future. Gavin Wood, the founder of Polkadot, gives an idea of ​​XCM’s goals as “language communicating ideas between consensus systems“.

Quarkslab has performed a second full audit of XCMv2. The purpose of this check is to catch any potential security or fairness issues between the chains, including logic bugs, denial of service, possible locking and unlocking errors, and debugging on both chains.


The audit took approximately 50 days and two Quarkslab security engineers worked on it. Following a full audit, they found no significant security issues within XCMv2. Additionally, the scope of the audit was a review of the underlying security of many XCM components. The audit report is useful for anyone interested in exploring the inner workings of Polkadot. XCMv2 is ready for the production version. At the same time, XCMv3 is currently in the final phase of development.

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Emile Stantina

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Cryptocurrency Polkadot (DOT), second audit validated by Quarkslab

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