Bitcoin’s most combative developer just took a paycheck from a NASDAQ-listed mining giant to build a private corridor for your transactions. And the excuse he is selling is your own safety.
On Thursday, MARA Foundation — the software arm of mining giant MARA — announced that Peter Todd is taking over Slipstream, the company’s private Bitcoin mempool. Not a research paper. Not a mailing-list argument. A product. Todd will develop it and run it.
This is the same Peter Todd who co-authored BIP-125, the replace-by-fee rule. The same Peter Todd who built Libre Relay, a fork of Bitcoin Core with looser relay rules, precisely so more transactions could get through — because, in his own words, mempool policy should serve what the market wants miners to mine. And this is the same Peter Todd who, weeks ago, floated a 0.1% annual tax on simply holding Bitcoin and argued it could be pushed through as a soft fork, without a real vote (we covered that proposal here).
He has now accepted a job where his entire product is a lane most people cannot see.
What Slipstream Actually Is
Slipstream lets you send bitcoin straight to MARA Pool without broadcasting it to Bitcoin’s public peer-to-peer network. Your transaction stays invisible until it appears confirmed in a block — mined by MARA.
The pitch behind it is genuinely uncomfortable, and it is not fake. When you broadcast an unconfirmed transaction to the whole network, you expose information about your keys to everyone before that transaction is locked in. After the July Coldcard firmware exploit drained more than $115 million from self-custody users, that exposure stopped being theoretical — white hats later clawed back 52 BTC from the thief.
So yes: hiding your transaction until confirmation is a real, sensible feature. That is not the problem.
The Problem Is Who Owns the Fast Lane
Bitcoin’s mempool was never neutral. It was always a market — miners decide what actually gets mined. But it was an open market. Everyone saw the same queue, everyone competed on the same fee dial, and the rules were published, argued over, and enforced in public.
Slipstream puts a private room next to that open market. Inside that room, one company sees transactions before the rest of the network does. Today that room is mostly used for Ordinals inscriptions, quantum-safe Bitcoin research, and Binohash experiments. Tomorrow it is whatever MARA decides is worth prioritizing. And here is the sentence nobody at MARA will say out loud: mempool privacy is now a product, and the seller answers to shareholders.
The Purity Police Always Arrive on Schedule
Weeks ago the self-appointed Bitcoin purity police tried to fork the network and it lasted two blocks. The lesson from that comedy is not that Bitcoin is immune to everything. It is that Bitcoin absorbs this stuff slowly, loudly, and by pricing it.
Censorship in Bitcoin rarely arrives as a blunt refusal to mine your transaction — look at how close we came with the BIP-110 censorship gate. It arrives as asymmetry: somebody gets to see the queue first, and you find out later.
The Coldcard Hack Was Never an Argument for a Private Mempool
Be brutally honest about the story this industry is telling itself. The $115 million Coldcard disaster was not caused by the public mempool. It was caused by keys leaking — entropy that was not random, firmware users could not verify, and people who followed the instructions and still lost everything.
No private relay fixes a compromised seed. If your keys are broken, hiding your broadcast is like tinting the windows on a car with no brakes.
The fix was always the boring one: verify your hardware and hold your own keys. Custodial history keeps teaching the same lesson, and nobody has learned it yet — outages, hacks, frozen withdrawals, every single time.
What Actually Changes for You
- Your transaction now has two doors: the public one where everybody sees you before confirmation, and the private one where a publicly traded miner sees you first.
- Fees still rule — but relationships now matter too.
- Nobody is forced to use Slipstream. But every private lane that becomes normal makes the public lane a little more like the slow lane.
FAQ
Is Slipstream censorship?
Not by itself. Miners have always chosen what to mine. The question is transparency — whether the queue you are competing in is visible to you. A private mempool does not stop your transaction; it just is not shown to you first.
Does using Slipstream mean I am not self-custodial?
You keep your keys. You are just not broadcasting to the network yourself. You are routing around peers you never verified anyway.
What is the actual defense?
A node you control, a wallet you verified, and keys that never touch somebody else’s server. Boring, unfashionable, and the only thing that has ever worked.
The Love Is Bitcoin Takeaway
Self-custody was never only about holding your own coins. It is about owning the pipe: running your own node, broadcasting through your own node, and knowing exactly who can see your transaction before it is confirmed. The moment privacy becomes a vendor feature, ask who the vendor is and what they are optimizing for. MARA is not the villain here — it is a business doing business. But the entire reason Bitcoin matters is that you are not supposed to need a business’s permission to be private.
Source: Bitcoin Magazine — “Peter Todd Joins MARA to Lead Private Mempool Slipstream” by Mathew Di Salvo, October 1 2026. This article is for education only and is not financial advice.
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So here is the question, and I want real answers in the comments: who should see your transaction before it is confirmed — everyone on the network, or whoever pays the biggest miner?
BITCOIN'S LOUDEST PURIST JUST TOOK THE BIGGEST MINER'S PAYCHECK TO BUILD A PRIVATE LANE FOR YOUR TRANSACTIONS
