Feature Summary

📜 TL;DR:

• Smart contracts on Hemi can access Bitcoin data by calling the hVM precompile contract.

• Future protocol upgrades will add additional precompile calls to provide additional information.

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🌐 Overview

• Smart contracts on Hemi can access Bitcoin data by calling the hVM precompile contract addresses, which query the deterministic TBC node running inside the EVM.

• Future protocol upgrades will add additional precompile calls to provide additional information like Bitcoin fee levels, Bitcoin block construction information, and popular metaprotocols like Ordinals, BRC-20s, and Runes.

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ℹ️ "Phase 0" Precompile Summary

Name	Address	Description
BtcBalAddr	0x40	Gets the balance of an address in satoshis. Supports all address formats: P2PKH, P2SH, P2WPKH, P2WSH, P2TR.
BtcUtxosAddrList	0x41	Gets the list of Unspent Transaction Outputs (UTXOs) for an address. Supports pagination.
BtcTxByTxid	0x42	Gets parts of a Bitcoin transaction by its TxID. The caller can specify which part(s) of the transaction to return using packed bitflags to increase gas efficiency by dropping unnecessary data.
BtxTxConfirmations	0x43	Gets the number of confirmations a specified transaction by TxID has.
BtcLastHeader	0x44	Gets the most recent Bitcoin header known by hVM.
BtcHeaderN	0x45	Gets the canonical Bitcoin header at height N.
BtcAddrToScript	0x46	Converts a Bitcoin address to its corresponding script representation. Supports all address formats: P2PKH, P2SH, P2WPKH, P2WSH, P2TR.