Will an Antminer S21 find a block solo?

Maybe, but don't count on it. 200 TH/s is a few ten-millionths of network hash, so the average wait is decades. It is a genuine lottery — far better odds than a Bitaxe, the same long shot overall.

Which tier and port should an S21 use?

The Pro tier on stratum.sololuck.io:4334 (high difficulty), or :3334 if you want TLS. Username is your bc1 address with an optional .worker label; the password can be anything.

Is solo worth it versus a normal pool?

For steady income, no — a pooled FPPS pool pays predictably on a 3.5kW power bill. Solo is only for the lottery shot at a whole block paid straight to your own address.

Can I run an S21 at home?

Only with real infrastructure: a 200-240V dedicated circuit, around 3.5kW of cooling and airflow, and somewhere that tolerates ~75dB constant noise. A garage or shed, not a bedroom. The Hydro variant is quieter but needs a water loop.

Do my odds improve on SoloLuck?

No. No pool changes block odds — they are identical everywhere. SoloLuck only changes the fee (2%, charged solely on a solved block), the non-custodial payout, and the ~6ms Asia latency.

SoloLuck

Solo mine an Antminer S21

← back to pool

Your live odds with a Antminer S21

At about 200 TH/s and the current network difficulty of 133.87T, the statistical mean time for a single Antminer S21 to solve a block solo is:

Avg time to a block

≈ 91 yr

Your share of the network

1 in 5.1 million

Recommended tier

:4334

“Avg” is the statistical mean — real luck swings wildly either way, which is the whole point of solo. The numbers move with the network; run your own on the odds calculator.

An S21 is industrial kit

The Antminer S21 is Bitmain's air-cooled SHA-256 workhorse: 200 TH/s for about 3,500 W (≈3,550 W at the wall), roughly 17.5 J/TH, built on BM1368 chips. It is not a desk toy. Expect ~75 dB — a loud vacuum cleaner that never stops — a 200–240 V supply, and a circuit that can carry 3.5 kW continuously.

Pointed at a true-solo pool, that hashrate mines for itself. Find a block and the whole reward lands on your address. Find nothing — the usual outcome — and you've spent power for the lesson. Solo mining is a lottery, not income. An S21 buys a lot more tickets than a Bitaxe, but it's the same draw.

Why solo an S21 — and why not

The honest case for solo:

Far better odds than a Bitaxe. At 200 TH/s you carry ~130–200× the hashrate of a single Bitaxe, so ~130–200× the tickets in the same lottery.
The full reward, on-chain, to you. Solve a block and the coinbase pays straight to your address — no custodian, no withdrawal.
A true-believer hedge. Some run one rig solo as a long shot at a whole block while the rest of the fleet earns steady pooled income.

The honest counterpoint, because it matters:

You're still a rounding error. 200 TH/s is a few ten-millionths of global hash. On average a single S21 goes the better part of a lifetime between blocks. The live card on this page does the exact maths for current difficulty.
Pooled pays the bills. If you need predictable return on a 3.5 kW power bill, a normal (FPPS) pool is the rational choice. Solo is for the lottery, not the ledger.
The odds are identical everywhere. No pool changes your chance of a block. A pool only changes fee, payout style and latency. See /compare.

Point it at SoloLuck — Pro tier (:4334)

An S21 belongs on the high-difficulty Pro tier so it isn't spammed with tiny shares. In the Antminer web UI open Settings → Pools (or Miner Configuration) and set Pool 1:

Field	Value
Stratum URL	`stratum+tcp://stratum.sololuck.io:4334`
Worker	`bc1youraddress.s21`
Password	`x` (anything)

Your username is your own bc1 Bitcoin address plus an optional .worker label — that address is where a solved block pays. Use a wallet you control (a hardware wallet is ideal); never an exchange deposit address. Want encryption? Use the TLS tier on stratum.sololuck.io:3334 if your firmware supports it. Fill Pool 2/3 with the same details as a fallback. Save, and the unit restarts mining. Full walkthrough at /setup.

Power, cooling and noise — for real

Power: ~3.5 kW continuous on 200–240 V. That's a dedicated circuit and a proper PSU/PDU — not a household power strip.
Heat: nearly all 3,500 W comes back out as heat. A single S21 will overwhelm a small room; plan real airflow, an exhaust path and filtered intake.
Noise: ~75 dB at full tilt, constant. Garage, shed or a sound-boxed space — not a bedroom or office. If noise is the deal-breaker, the S21 Hydro (water-cooled, ~335 TH/s) is quieter but needs a coolant loop and dry cooler.
Stability: solo only pays the rig that's up when the block comes. Clean power and cooling are the whole game over months of running.

Confirm it's actually mining

Two checks:

In the miner's Miner Status / Pools page, Pool 1 should read Alive with Accepted shares climbing and a real-time hashrate near 200 TH/s. A BM1368-class machine takes a few minutes to ramp.
On our side, open /users/your-bc1-address — your worker appears with its hashrate and last-share time. /verify shows the coinbase proof that a block pays your address, not ours.

If shares are accepted, you're in the draw. Nothing else to do but keep it cool and running.

The honest odds at 200 TH/s

No spin: at 200 TH/s you hold a tiny slice of total network hash, so on average a single S21 waits decades — often longer — between blocks. It could land tomorrow or never; that's what a lottery is. The live card above runs the exact expected-time figure against today's difficulty.

What SoloLuck changes is only what a pool can change: a 2% fee taken solely from a block you actually solve (one coinbase output; 0% the rest of the time), a non-custodial payout straight to your address, and a Jakarta node ~6 ms from Indonesia versus ~250 ms to US pools — fewer stale shares on the rare block you do find. We've found no blocks yet; the load so far is mostly operator test rigs. We won't pretend otherwise.

Ready to take a ticket?

Paste your address and copy the config from /setup, watch the pool on /status, and check every claim on /verify. Mine to your own address — that is what makes it truly solo.

Get the setup config →

Not ready to point a miner yet? Run your gear through the odds calculator, or join Telegram for block & record alerts — no rig required.

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