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Cronos

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Cronos is an Ethereum-compatible blockchain ecosystem associated with Crypto.com. Its main programmable network, Cronos EVM, launched in beta on 8 November 2021. It combines Ethereum-style smart-contract execution with the Cosmos SDK and Inter-Blockchain Communication protocol. CRO is used to pay network fees and participate in the wider Cronos ecosystem.[1][2]

History

Crypto.org announced the Cronos testnet in 2021 as a way for developers to move Ethereum applications into the Cosmos ecosystem. The mainnet beta opened on 8 November 2021 with EVM support, a bridge to the Crypto.org Chain and an initial group of validators and application partners. Contemporary independent coverage described Cronos as a parallel, EVM-compatible chain powered by CRO.[3][4]

The name Cronos later came to cover several related networks. Cronos EVM is the programmable Cosmos-based chain described in this article; Cronos POS is a separate proof-of-stake payments chain, and Cronos zkEVM is a separate zero-knowledge rollup. Cronos Labs announced in June 2026 that the zkEVM alpha would be retired in June 2027, without ending Cronos EVM.[5]

Technology

Cronos EVM is built with the Cosmos SDK and Ethermint, which embeds an Ethereum Virtual Machine in a Cosmos application. Its consensus layer uses a permissioned variant of proof of stake based on Tendermint/CometBFT. Validators order transactions and commit blocks, while Ethereum-compatible accounts, tools and contracts run in the EVM execution environment.[6][7]

The chain supports the Inter-Blockchain Communication protocol for connections to compatible Cosmos networks. Its custom modules map some IBC assets into CRC-20 contracts that can be used by Ethereum-style applications. This architecture provides EVM compatibility but does not make Cronos an Ethereum rollup: it has its own validator set, consensus and governance rather than settling state transitions to Ethereum.[8]

CRO and governance

CRO is the native fee asset of Cronos EVM and is also used across Cronos POS and Crypto.com products. Onchain governance and validator selection are based on the Cosmos software stack, but the EVM chain's validator admission has historically been permissioned. Describing the network simply as proof of stake can therefore obscure the role of the approved validator set.[9]

Cronos is open-source, while ecosystem development and branding are coordinated by Cronos Labs and are closely linked to Crypto.com. The relationship provides distribution and infrastructure but also makes organizational and token governance important when assessing decentralization.

Ecosystem

The network was launched for decentralized finance, non-fungible-token and gaming applications. Early projects included exchanges, lending markets and bridges. Tectonic, a lending protocol and one of the launch partners named by Cronos, later became the source of the network's largest governance intervention.[10]

2026 Tectonic incident

On 30 August 2026, an attacker manipulated the market price of Tectonic's thinly traded TONIC token and used the inflated collateral value to borrow assets across nine lending markets. Cronos's subsequent postmortem, as reported by The Block and Cointelegraph, calculated $120.4 million in affected borrowing. Validators halted the chain at block 90,907,150 and restarted it from block 90,896,188, discarding 10,961 blocks—about 1 hour and 54 minutes of chain history.[11][12]

The rollback reversed approximately $111.2 million of the affected positions. About $9.19 million had already left Cronos and was not recovered through the rollback. Block production resumed roughly eleven hours after the attack began. These later figures superseded the preliminary $75 million estimate reported while the chain was halted.[13][14]

The intervention restored most affected balances but also reversed unrelated transactions in the discarded blocks. Cronos said validators chose between expected transaction finality and leaving the borrowed assets under the attacker's control. The event consequently illustrated both the practical reach of coordinated validator action and the governance trade-off created by a permissioned validator set.

See also

  1. ↑ Cronos Mainnet Beta is now live, Cronos Labs, 8 November 2021.
  2. ↑ Cronos source repository, Crypto.org Chain, accessed 15 September 2026.
  3. ↑ Diving into Cronos, CoinGecko Research, 2022.
  4. ↑ CRO-powered Cronos blockchain launches mainnet beta, CoinCodex, 8 November 2021.
  5. ↑ Sunsetting the Cronos zkEVM Alpha in 2027, Cronos Labs, 3 June 2026.
  6. ↑ Cronos architecture overview, Crypto.org Chain source repository, accessed 15 September 2026.
  7. ↑ Architecture, Cronos documentation source, accessed 15 September 2026.
  8. ↑ Cronos whitepaper, Cronos Labs, 2022.
  9. ↑ Architecture, Cronos documentation source, accessed 15 September 2026.
  10. ↑ Cronos Mainnet Beta is now live, Cronos Labs, 8 November 2021.
  11. ↑ Cronos says $9.2 million remains unrecovered after Tectonic exploit, chain rollback, The Block, 8 September 2026.
  12. ↑ Cronos confirms $9.2M slipped away before Tectonic exploit rollback, Cointelegraph, 8 September 2026.
  13. ↑ Crypto.com's Cronos halts entire blockchain after $75M Tectonic exploit, Decrypt, 31 August 2026.
  14. ↑ Cronos says $9.2 million remains unrecovered after Tectonic exploit, chain rollback, The Block, 8 September 2026.
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