MARA opens Slipstream to public as a free, permissionless Bitcoin transaction tool

MARA Holdings has made its Slipstream transaction service free and open to the public, letting any Bitcoin user submit transactions directly through the company’s mining pool without touching the public mempool. The move turns a formerly restricted infrastructure tool into something any Bitcoin holder can use from a browser.

The service is live at slipstream.mara.com, requires no client software, and carries no additional fees beyond standard Bitcoin network transaction costs.

What Slipstream actually does

When you broadcast a transaction to the public mempool, it sits in a waiting room that anyone can read. Sophisticated actors can spot your transaction, analyze it, and in certain cases exploit that information before your transaction confirms. For multisig setups, particularly those involving Coldcard wallets, this creates a real vulnerability window.

Slipstream routes transactions directly into MARA’s mining pool, bypassing that public waiting room entirely. The front-running risk drops significantly because there’s nothing to front-run if the transaction was never publicly visible.

The service was originally built for a narrower purpose. When Marathon Digital Holdings first launched Slipstream on February 22, 2024, the goal was handling large or unusually complex transactions that standard mempool systems tend to deprioritize.

Opening it to the general public on August 3, 2026, reframes Slipstream from an infrastructure utility into something closer to a consumer security product.

The fee structure is simple but worth understanding

MARA is not charging a premium for the service itself. Users pay standard Bitcoin network transaction fees, with one floor: the minimum submission rate is the greater of 1 sat/vByte or the current mempool priority rate.

Why this matters for Bitcoin users and MARA’s positioning

The vulnerability Slipstream addresses is real, particularly for multisig transactions. Multisig setups require multiple signatures before a transaction can move funds, and the partial signature data that sometimes becomes visible during the broadcast process can expose information about wallet structure and spending conditions. For Coldcard users specifically, MARA has flagged this as a meaningful risk that Slipstream is designed to mitigate.

The company rebranded from Marathon Digital Holdings to MARA Holdings in 2024, signaling a broader ambition beyond being a pure-play mining operation.

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