Over an hour of dev brain-melting detail, but the vision is getting clearer.

✨ Some fresh alpha #BTCfi that CT hasn’t shipped yet 👇

1️⃣ First off, Bitcoin state access is real and the way #Hemi does it is wild.

→ Smart contracts on Hemi can read Bitcoin’s UTXO state directly, not a mirror or a wrapped proxy. Real Bitcoin, two blocks behind the tip.

→ This is possible because of TBC, their own embedded Bitcoin node (14k lines of Go), designed to plug into an EVM like it was always meant to be there.

→ It’s deterministic, secure, and even handles Bitcoin reorgs gracefully. Devs can tune finality windows based on risk.

And no mempool access inside smart contracts. Because that’s non-deterministic and would break consensus. They actually thought this through.

2️⃣ Next up is data availability, a crucial piece of the Hemi architecture

→ Hemi anchors to Bitcoin for security but uses Ethereum (via EIP-4844 blobs) for DA.
Because Bitcoin’s 4MB blockspace is precious and too expensive to spam with L2 state.

→ Ethereum’s blob market is optimized for L2 publishing, so you get low cost, higher throughput, and better dev infra support.

So Hemi uses Bitcoin for settlement and security, and Ethereum for data availability

3️⃣ They’re also working on zk-proven light clients, where smart contracts can verify full BTC + ETH state with zero knowledge.

That unlocks ultra-trustless systems without forcing anyone to run a node.

They previewed Chain Builder, a plug-and-play L3 system that inherits Hemi security and transitively, Bitcoin finality without needing to publish directly to BTC.

Meaning a whole forest of L3s, each configurable (with or without Bitcoin support), sharing finality and security budget.

5️⃣ And they’re not stopping at just programmable Bitcoin, Hemi is shipping:

→ Randomness from Bitcoin block hashes, plus future VRF integrations

→ Migration to Testnet4 to avoid chaos from legacy testnet reorgs

→ Long-term support for SegWit, Taproot, and a multi-chain pop security tree

Some still optimizing for cheaper and faster txs, Hemi is building foundational infrastructure for a multi-chain future where Bitcoin is a programmable base layer.

You’ll use Bitcoin in your app, trustlessly, without giving up sovereignty, and settle it to Ethereum DA.

🔗 Full recap: