Hemi: integration of Bitcoin and Ethereum in one ecosystem

Main Idea

Hemi is a second-layer solution that connects the two largest blockchain ecosystems — Bitcoin and Ethereum — into a single platform. The project allows developers to utilize the security of Bitcoin while simultaneously taking advantage of the flexibility of Ethereum smart contracts.

In short: it is a bridge that makes Bitcoin programmable without requiring traditional binding protocols.

Who is behind the project

Hemi was created by Jeff Garzik ( one of the early developers of Bitcoin Core ) and Max Sanchez ( a blockchain security specialist and former Coinbase employee ). Their goal was simple - to bridge the gap between Bitcoin Script and the smart contract ecosystem.

How the architecture is structured

Virtual machine and access to Bitcoin data

The main feature of Hemi is a special virtual machine (hVM). How to create a virtual machine that is compatible with Ethereum but works with Bitcoin? The developers embedded a full Bitcoin node directly into the EVM.

Thanks to this, smart contracts gain direct access to Bitcoin information: transactions, balances, UTXO, and other data. At the same time, developers are not dependent on external relays.

To synchronize data, a lightweight process Tiny Bitcoin Daemon (TBC) is used. It connects to the Bitcoin network, downloads blocks, and updates information on all Hemi nodes. Each new block in the Hemi network contains the current snapshot of the Bitcoin state.

Proof of Proof Consensus

Hemi uses the Proof of Proof consensus mechanism (PoP), which anchors the state of the network to the Bitcoin blockchain. Here's how it works:

PoP miners periodically publish cryptographic proofs of the Hemi state directly on Bitcoin. For this, they receive rewards in the HEMI token.

Since the time of block creation for Bitcoin can vary, the system applies a delay of 9 Bitcoin blocks ( approximately 90 minutes ). After that, the blocks are considered final. This approach reduces the risk of chain reorganization and disputes over consensus.

Cross-chain transfer tunnels

Instead of traditional bridges, Hemi uses tunnels — a protocol-level cross-chain mechanism. Tunnels track the state of both blockchains directly, without relying on external relays.

When depositing, assets are locked on the original blockchain, and equivalent tokens are created on Hemi. When withdrawing, the tokens are burned, and the original assets are released.

As of September 2025, the tunnels support ERC-20 and BRC-20 standards. In the future, it is planned to add more native Bitcoin and Hemi assets to enhance DeFi integration capabilities.

Developer Library

Hemi Bitcoin Kit (hBK) is a toolkit and smart contracts that simplify working with Bitcoin data. Developers can quickly integrate Bitcoin into decentralized applications without complex infrastructure and external dependencies.

HEMI Token: Usage and Functions

The native token HEMI has a maximum supply of 10 billion units. Within the ecosystem, it is used for several key functions:

Governance — HEMI holders vote on protocol updates, parameter changes, and network development.

Security — HEMI staking supports the PoP mechanism and incentivizes validators to publish states in Bitcoin.

Fees — HEMI serves as a means of payment for transactions when deploying contracts, interacting with Bitcoin, and cross-chain transfers.

Rewards — participants can stake HEMI and receive a portion of the network rewards, including block rewards and fees.

What happened to HEMI in 2025

In September 2025, HEMI was included in the airdrop program for holders. 100 million tokens were allocated for this event, which is 1% of the total supply.

The token received a listing with the Seed tag and began trading on several trading pairs.

As a result

Hemi addresses a real problem: how to make Bitcoin more useful for decentralized applications without compromising its security. The project offers infrastructure for building DeFi services, cross-chain liquidity, and Web3 applications that operate trustlessly and interact between blockchains.

The architecture is based on the Bitcoin node built into the EVM and the consensus anchored in Bitcoin itself — this makes Hemi an interesting experiment in the field of modular blockchains.