5 posts.
BOB is an OP Stack rollup for Bitcoin assets that pays gas in ETH. Measured: 2 s blocks, a 252 wei base fee, a transfer costing ~$0.0007 (92% of it L1 data), safe and finalized moving together 29 to 55 minutes behind, a 2,000-block eth_getLogs cap, and no tracing at any public RPC we tested.
Read →Hemi is an OP Stack chain whose EVM can read Bitcoin. Measured: 12 s blocks, a 252 wei base fee, a transfer costing ~0.00000018 ETH (88% of it L1 data), the hVM Bitcoin precompiles in practice, ~20 min to finalized, full archive and eth_getLogs limits.
Read →Bitcoin Core's JSON-RPC can't tell you an address's balance — it has no address index. Here's the gap, the three ways to fill it, and how to pick a Bitcoin RPC provider.
Read →ZetaChain is an omnichain L1 (chain ID 7000) where a single Solidity contract can read and write across connected chains — including native Bitcoin, no wrapping, no centralized bridge. The ZetaEVM is standard eth_* (viem/ethers work), but it sits on a Cosmos-SDK base with a TSS validator set. Here's the developer map.
Read →Rootstock (RSK) is an EVM sidechain merge-mined by Bitcoin — chain ID 30, RBTC gas pegged 1:1 to BTC, ~30s blocks. viem and ethers connect in one line, but two things trip up Ethereum devs: gas is denominated in Bitcoin, and addresses use an EIP-1191 checksum that standard tooling gets 'wrong'. Here's the map.
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