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Hyperbridge (Polkadot-Ethereum Bridge)

avoid.net/hyperbridge-polkadot-ethereum-bridge→38/100·82% conf.
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Summary

Hyperbridge is a cross-chain interoperability bridge built by Polytope Labs, connecting Polkadot to Ethereum and EVM-compatible networks using zero-knowledge proof-based consensus verification. On April 13, 2026, an attacker exploited a Merkle Mountain Range (MMR) proof verification flaw in its Ethereum gateway contract, minting approximately 1 billion bridged DOT tokens and causing realized losses subsequently revised to $2.5 million across four EVM chains. The protocol was paused, underwent a full architectural rebuild rather than a patch, and relaunched in June 2026 with structural changes to governance, proof generation, and token architecture.

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□Hyperbridge (Polkadot-Ethereum Bridge)
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    Timeline(9 events)

    11 September 2024

    Hyperbridge raised $2.5 million seed round led by Web3 Foundation and Scytale Digital via the Polkadot Ecosystem Fund.

    CoinPaper

    2024

    Hyperbridge launched on Polkadot mainnet as a cross-chain interoperability bridge using zero-knowledge proof-based consensus verification.

    Hyperbridge Overview - Polkadot Wiki

    17 April 2025

    Polytope Labs reported raising over $5 million in total, including a $5.3 million seed round backed by the Polkadot Ecosystem Fund.

    TechCabal

    13 April 2026

    Attacker exploited MMR proof verification flaw in Hyperbridge's Ethereum gateway, minting approximately 1 billion bridged DOT tokens. Initial reported loss approximately $237,000. Gateway paused within hours.

    CoinDesk

    16 April 2026

    Hyperbridge revised total exploit losses to approximately $2.5 million, roughly ten times the initial estimate, after multi-chain forensic audit revealed losses across Ethereum, Arbitrum, Base, and BNB Chain incentive pools. Emergency bounds-validation patch deployed.

    Crypto Times

    21 April 2026

    Hyperbridge filed vulnerability disclosure with Parity Technologies after identifying identical bugs in two upstream ecosystem libraries.

    Hyperbridge Post-Mortem (official blog)

    11 May 2026

    SRLabs-audited version of patched codebase released; redeployment process began.

    Hyperbridge Post-Mortem (official blog)

    15 May 2026

    Hyperbridge launched a bug bounty program on HackenProof offering up to $50,000 for critical vulnerability disclosures. Over $150,000 reportedly paid to more than 20 researchers within the first week.

    Crypto Times

    16 June 2026

    Hyperbridge relaunched with full architectural rebuild including Hyperfungible Token standard, permissionless proof generation, decentralized governance, and LayerZero-compatible OFT adapter.

    Crypto Times
    Provenance & Audit Trail
    Anchored on SolanaVerify on-chain21 Wayback Archives

    Decision Log

    This investigation is cryptographically anchored to the Solana blockchain (1 event). 21 of 22 cited source URLs have an Internet Archive snapshot.

    full audit log →version history →

    model: claude-sonnet-4-6

    generated: 6/17/2026, 11:08:38 PM

    last updated: 7/28/2026, 11:20:13 AM

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