Overview
Rebar Shield is a private transaction relay that delivers your Bitcoin transactions directly to mining pools, bypassing the public mempool.
Why Shield?
When you broadcast a transaction through the Bitcoin P2P network, it's visible to everyone before a miner includes it in a block. This creates opportunities for frontrunning, sandwich attacks, and other MEV extraction — especially for metaprotocol transactions like BRC-20 mints and Rune etching where ordering matters.
Shield removes this exposure by routing transactions through a private channel directly to mining pools.
How It Works
- Query Shield for the current fee tiers and payment address
- Build your transaction with an explicit Shield fee output (inputs must equal outputs)
- Submit via JSON-RPC — Shield validates and relays to partnered mining pools
- Your transaction is mined without ever entering the public mempool
Key Details
- No API key required
- Bitcoin mainnet only
- Bitcoin Core JSON-RPC compatible — uses
sendrawtransaction - Fee-based — you choose a fee tier based on desired hashrate coverage
- Shield is not open source
Next Steps
- Getting Started — Submit your first private transaction
- Transaction Fees — Understand the fee model
- Selecting Hashrate — Choose the right fee tier for your confirmation needs