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Bitcoin on Mars

Light takes 3.0 to 22.3 minutes to fly from Earth to Mars, while a Bitcoin block arrives every 10 minutes on average. What that means for mining, difficulty and block size, why Earth stays the center, and how Martians could still pay in Bitcoin.

In 30 seconds

  • A message from Mars takes 3.0–22.3 minutes to reach Earth. That is about one block, sometimes more than two.
  • So a Mars miner often finds a block nobody needs anymore: Earth already found its own. With 10% of hashrate it would lose 35% to 87% of its income.
  • Bitcoin has one set of rules: one chain, one difficulty, 10 minutes. Changing them for Mars is very hard.
  • Most likely Mars would pay on a second layer (Lightning, a sidechain) and the main chain would live on Earth.

Story: the block that arrived too late

Year 2071, Jezero settlement. Ana runs the dome's only mining rig on a field of solar panels the size of two football pitches. At 06:12 local time her rig finds a valid block. She grins, then checks the clock on the wall: Earth is 19 light-minutes away today. For the next 19 minutes, her block is a secret flying through space. And 9 minutes ago, while her rig was still hashing, a pool in Texas found a block too. That news is still on its way to her. By the time the two messages pass each other near the asteroid belt, the race is already decided. Earth has 98 times her hashrate. Ana's block will be stale. She shrugs, opens her Lightning wallet and pays for coffee with coins her company locked in a channel two years ago. On Mars, nobody mines for the reward. They mine to learn, and they pay on layer two.

Fiction. The 19-minute delay and the hashrate share are illustrative.

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Light delay vs the 10-minute block

NASA gives the Earth–Mars distance as 54.6 to 401.4 million km [NASA]. Divide by the speed of light (299,792 km/s) for the one-way delay. Bitcoin targets one block every 10 minutes on average [whitepaper].

PositionM kmdelay, minin blocksfork if all nodes had it
Closest possible (theory)54.63.040.326.2%
Typical opposition78.34.360.435.3%
About average225.012.511.371.4%
Farthest (behind the Sun)401.422.322.289.3%

For comparison, on Earth in 2013 a block reached half of nodes in 6.5 s, and 1.70% of blocks forked [Decker & Wattenhofer].

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Stale blocks: the simple math

A block goes “stale” when someone else found a competing block at the same time and the network picked theirs. While a Mars block flies to Earth, Earth keeps mining its own version. And the other way round: an Earth block found a few minutes earlier has not reached Mars yet.

PositionMars 10%: staleEarth: staleMars income lostMars 30%: stale
Closest possible (theory)37.9%0.6%35%24.2%
Typical opposition48.9%0.8%46%32.0%
About average80.5%2.2%78%57.9%
Farthest (behind the Sun)88.4%3.6%87%66.9%

Model. Blocks arrive as a Poisson process (as in whitepaper §11), mean interval T = 600 s. Mars has hashrate share a, one-way delay d.

P(conflict, Mars) = 1 − e^(−(1−a)·2d/T)
stale(Mars) ≈ P(conflict, Mars) × (1−a)
stale(Earth) ≈ (1 − e^(−a·2d/T)) × a
fork(uniform d) = 1 − e^(−d/T)

Sanity check on Earth: with d = 6.5 s the formula gives 1.1%, and Decker & Wattenhofer observed 1.70%. Same ballpark. The model is rough: no relays, header-first or miner strategies. [Decker & Wattenhofer]

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Calculator: date → delay → stale blocks

Pick a date (planet positions from NASA JPL orbits) or a distance, and the Mars share of hashrate.

Distance
237.5 M km
One-way delay
13.2 min
Mars stale rate
81.6%
Mars earns of rewards
2.0%

With 10% of hashrate Mars should earn 10% of rewards but earns 2.0%: 80% of its income lost. Earth's stale rate is 2.3%. Light travels 1.32 blocks one way. Sun–Earth–Mars angle: 70.7°.

Simple model: blocks as a random (Poisson) process, conflict if the other planet finds a block within ±delay, the race goes to each side with probability equal to its share. Orbits: JPL Keplerian elements. Thought experiment, not a forecast.

Why Earth stays the center

Reason one: hashrate. All mining is on Earth today, and a colony would need decades to build even a noticeable share.

Reason two: the delay works as a head start. An Earth miner hears about an Earth block in seconds, a Martian in minutes. All that time the Martian mines on an outdated tip. The smaller your share, the more you lose. A similar effect drives selfish mining: whoever learns about blocks first earns more than its share [Eyal & Sirer].

Bottom line: mining the main chain on Mars does not pay until Mars has close to half of the hashrate. Money and miners drift to where the delay is smallest, which is Earth.

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Block time and difficulty: one for everyone

Difficulty is recalculated every 2016 blocks so that blocks come every 10 minutes on average [Bitcoin Core]. It is one number for the whole chain. If Mars adds hashrate, difficulty rises for everyone and blocks go back to 10 minutes. A planet cannot have its own difficulty or block time inside the same chain.

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Would block size or block time need to change?

Block size barely matters here: the delay is physics, not bandwidth. Even an empty block takes 3.0–22.3 minutes. Block time would help: pick “60 min” in the calculator above and Mars' income loss drops a lot.

But changing block time is a hard fork: every node must accept the new rules or the network splits. Earth would get 6x slower payments for the sake of a colony with a tiny share of hashrate. Bitcoin's rules are hard to change on purpose, and that is one of its strengths.

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How Mars could still use Bitcoin

  • Mars sidechain or federation

    Coins are locked on Earth's main chain and a 1:1 copy lives on a fast Mars-local chain. Mars blocks every minute, settled back to Earth from time to time. The Puente & Puente paper (2025) suggests a strong federation first.

    Catch: You trust the federation signers to release coins back. That is a trust trade-off, not pure Bitcoin.

    [Back et al.][Puente & Puente]

  • Interplanetary Lightning channels

    Two parties open a channel on the main chain and then pay each other off-chain. Across planets, every timelock must be far longer than the round trip plus a conjunction blackout, so think weeks, not hours.

    Catch: Payments that hop Earth↔Mars take at least one round trip (6–45 min). Funds sit locked longer. You need watchtowers on both planets.

    [Poon & Dryja][BIP 65][Puente & Puente]

  • Mars-local L2 (ecash, local Lightning)

    Everyday payments stay on Mars: a local Lightning network or ecash mints. Only the occasional big settlement crosses to Earth.

    Catch: Ecash mints are custodial. Local Lightning still needs Earth's chain to open and close channels.

    [Poon & Dryja]

  • Merge mining

    Mars miners mine a Mars chain and, with the same work, also try for Earth's chain. Even if their Earth blocks are mostly stale, the work still secures the Mars chain.

    Catch: The Mars chain is a separate system with its own rules and risks. Blind merged mining needs a soft fork that is not activated.

    [Puente & Puente]

  • Proof of reserves

    Whoever holds the Earth-side coins for Mars publishes signed proofs that the coins exist, so colonists can check without trusting a statement.

    Catch: Proves the assets, not the liabilities. Information is always minutes old on the other planet.

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Solar conjunction: two weeks of silence

About every 26 months the Sun sits between Earth and Mars. NASA stops sending commands to its rovers for about two weeks because solar plasma corrupts radio signals [NASA] [NASA]. For a crewed mission NASA estimates a 2–3 week disruption [NASA]. For Bitcoin on Mars this means two weeks with no new blocks from Earth. Anything mined on Mars in that time will almost surely go stale, and Lightning timelocks must be longer than the blackout.

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Energy on Mars

Mars is farther from the Sun, so it gets 43.1% of Earth's sunlight: 586 vs 1361 W/m² at the top of the atmosphere [NASA]. The same panel makes less than half the energy, and dust storms can dim the Sun for weeks. Mining on Mars would compete for power with oxygen, heat and food. Most likely ASICs would run only on surplus, as heaters. Mining power on Earth →

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FAQ

Can you mine bitcoin on Mars at all?

Yes. Mining is just hashing, it works anywhere. The problem is not the mining, it is that your blocks reach everyone else 3 to 22 minutes late, so you lose most races.

Would Mars get its own difficulty?

No. Difficulty is one number for the whole chain, recalculated every 2016 blocks from timestamps. A planet cannot have a separate one inside the same chain.

Should Bitcoin switch to 1-hour blocks for Mars?

It would cut stale blocks for Mars, but it is a hard fork that every node would have to accept, and it makes payments slower for everyone on Earth. It is very unlikely, and layer-two options solve most of the problem without it.

Is this a forecast?

No. It is a thought experiment with a simple model. Real numbers would depend on hardware, relays and miner behaviour.

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Sources

Checked 2026-10-12. All delay and stale-block numbers are computed by us with a simple model. Thought experiment, not a forecast or investment advice.