Bitcoin mining infrastructure just picked up one of Bitcoin’s best-known transaction-relay developers. MARA Foundation says longtime Bitcoin Core contributor Peter Todd has joined as lead maintainer of Slipstream, its private transaction-submission service that sends eligible Bitcoin transactions directly to MARA Pool instead of broadcasting them through the public peer-to-peer network first.
The timing is notable because Slipstream recently demonstrated a practical security use beyond unusual transaction formats. MARA Foundation says the service helped users move more than 10,000 BTC out of affected Coldcard multisig wallets during the July 2026 firmware-vulnerability response.
Peter Todd Is Now Leading Slipstream
In its October announcement, MARA Foundation named Todd lead maintainer of Slipstream. Todd is a longtime Bitcoin Core contributor, co-author of BIP 125 for opt-in replace-by-fee, creator of OpenTimestamps, and developer of Libre Relay.
Those credentials fit the job because Slipstream sits directly at the boundary between Bitcoin’s public transaction-relay system and miner block construction. Todd has spent years studying the rules nodes use to decide which unconfirmed transactions they relay before those transactions ever reach a block.
What Slipstream Actually Does
Normally, a Bitcoin wallet broadcasts a transaction into the public peer-to-peer network. Nodes validate it against their local relay policy, place accepted transactions into their mempools, and forward them to other peers. Miners then select transactions from the set they can see when constructing candidate blocks.
Slipstream adds another route. A user can submit an eligible transaction directly to MARA Pool. That means the transaction does not need to circulate through the public mempool before MARA has an opportunity to include it in a block.
That distinction is easier to understand alongside BitcoinVersus’ explainers on Bitcoin node networking over port 8333, UTXOs, and how miners claim block rewards and transaction fees. Slipstream does not change Bitcoin consensus. It changes how a valid transaction reaches a miner.
The Coldcard Response Turned a Mining Tool Into a Security Tool
The clearest recent example came during the July 2026 Coldcard incident. For affected multisig users, broadcasting a recovery transaction publicly could reveal information before the transaction confirmed. A private submission path reduced that exposure window by keeping the transaction away from the public mempool until MARA could mine it.
MARA Foundation says Slipstream ultimately helped move more than 10,000 BTC out of affected Coldcard multisig wallets. Earlier in the response, MARA and Unchained publicly described thousands of BTC moving through the service as wallet providers integrated direct submission into recovery workflows.
That gives Bitcoin mining pools a role that is easy to miss when mining is discussed only in terms of hashrate and electricity. A pool also sits at a critical transaction-routing point between users and block inclusion. BitcoinVersus recently covered ViaBTC and Mempool’s transaction-acceleration integration, another example of mining infrastructure becoming more directly visible to wallet users.
Slipstream Also Gives Developers a Place to Test Unusual Transactions
Slipstream originally gained attention because standard node relay policies can reject transactions that are still valid under Bitcoin consensus rules. Direct miner submission creates a path for large or non-standard transactions that public nodes may choose not to relay.
MARA Foundation says recent research uses include Quantum Safe Bitcoin and Binohash. That makes Slipstream more than a fee-routing product. It can function as a proving ground where developers test transaction structures against a real miner without first requiring broad public-relay acceptance.
This connects directly to the debate BitcoinVersus discussed in “Bitcoin Should Validate Transactions, Not Decide What They Mean”: consensus rules determine whether a transaction is valid for Bitcoin, while individual node and miner policies influence whether that transaction is relayed or selected.
Why Todd Is an Interesting Choice
Todd’s background is unusually aligned with this problem. Replace-by-fee deals with how unconfirmed transactions compete. Libre Relay experiments with more permissive relay rules. OpenTimestamps uses Bitcoin’s blockchain as a time-ordering anchor. All three sit close to the transaction lifecycle that Slipstream is designed to explore.
In Bitcoin Magazine’s October 1 report, Todd described Slipstream as a natural complement to his work on mempool policy and as a place to test protocol ideas against actual economic demand.
Private Mempools Have Tradeoffs Too
The positive security and research use cases do not remove the tradeoffs. Public mempools distribute transaction visibility across many independent nodes and miners. A private submission channel instead depends on the policies, availability, and hashrate of the operator receiving the transaction.
That makes private mempools useful tools rather than automatic replacements for public relay. They can reduce pre-confirmation exposure, support transactions that standard policy will not relay, and create new miner services, while also concentrating routing decisions inside individual pools.
The mining side still matters operationally too. A private transaction is only useful if the receiving pool can actually mine a block. That is where Stratum, pool hashrate, block construction, and reliable miner connectivity all meet the transaction layer.
Why This Is Good News for Bitcoin Mining
The strongest part of this story is that mining infrastructure is being used for something broader than simply pointing ASICs at a pool and collecting rewards.
A miner-operated service helped users protect funds during a wallet-security emergency. The same service is being used for protocol research. And now a veteran Bitcoin developer is taking responsibility for its continued development.
That is exactly the kind of mining story that deserves more attention: hashrate becoming useful infrastructure for Bitcoin users and developers, not just an industrial number on a dashboard.
What Comes Next
Todd says he wants to use Slipstream as a proving ground for further Bitcoin experimentation. The important things to watch will be which wallet integrations adopt private submission, what new transaction formats researchers test, how MARA’s mempool policy evolves, and whether other mining pools build comparable direct-submission systems.
Bitcoin miners already secure the chain by producing blocks. Slipstream shows that the infrastructure around those blocks can become a product—and sometimes a public-good tool—in its own right.
BitcoinVersus.Tech
Editor’s Note: Slipstream is operated by MARA and remains subject to MARA’s policies, terms, availability, fee requirements, and applicable law. Private transaction submission changes pre-confirmation routing; it does not bypass Bitcoin consensus rules or guarantee inclusion in a block.
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