# Solo Mining Bitmain Antminer S21 Pro on Bitcoin (BTC)

Machine-readable solo mining datasheet for running **Bitmain Antminer S21 Pro** on the **Bitcoin (BTC)** SHA-256 network. Evaluates hashrate output, electrical operational expenditure, Poisson block-finding probabilities, and mining economics tracked by BackPoW.

## Executive Summary

- Target Rig: Bitmain Antminer S21 Pro (ASIC)
- Target Network: Bitcoin (BTC) — Algorithm: SHA-256
- Rig Hashrate: 234.51 TH/s (2.345148e+14 H/s)
- Power Consumption: 3,510 W (84.24 kWh/day)
- Energy Efficiency: 14.97 J/TH
- Network Hashrate: 1089.78 EH/s (1.089781e+21 H/s)
- Network Hash Share: 2.151944e-07 (0.000022%)
- Expected Block Discovery: about a 1-in-84 chance per year (mean time: ~83.2 years)
- Operational Breakeven Electricity: 0.1014 USD/kWh

## Solo Mining Metrics Table

| Metric | Value | Unit | Description |
| --- | --- | --- | --- |
| Mining Device | Bitmain Antminer S21 Pro | text | Hardware model name |
| Device Class | ASIC | text | ASIC, GPU, or CPU architecture |
| Device Hashrate | 234.51 TH/s | H/s | Nominal hashrate on SHA-256 |
| Device Power Draw | 3,510 | Watts | Power consumption at wall |
| Energy Efficiency | 14.97 J/TH | unit | Energy per unit hash computation |
| Network Hashrate | 1089.78 EH/s | H/s | Total active network hash power |
| Network Difficulty | 140,577,680M | number | Current consensus target difficulty |
| Block Time (Observed) | 564.7 | seconds | Average interval between blocks |
| Block Reward | 3.1400 | BTC | Full coinbase block reward + fees |
| Coin Spot Price | 82,667.0000 | USD | Current market exchange rate |
| Single Block Value | 259,574.38 | USD | Gross fiat value of one block |
| Mean Time to Block | 83.2 years | time | T = (Nethash / Hashrate) * BlockTime |
| Daily Block Probability | 0.003292% | percent | 24-hour Poisson chance |
| Monthly Block Probability | 0.0987% | percent | 30-day Poisson chance |
| 1-Year Block Probability | 1.20% | percent | 365-day Poisson chance |
| 3-Year Block Probability | 3.54% | percent | 3-year cumulative chance |
| Expected Blocks / Year | 0.0120 | count | Average over 365.25 days |
| Daily Gross Output | 0.000103 | BTC | Expected daily coin yield |
| Daily Gross Value | 8.55 | USD | Revenue before power costs |
| Daily Energy Consumed | 84.24 | kWh/day | Kilowatt-hours consumed |
| Power Cost @ 0.05 USD/kWh | 4.21 | USD/day | Low industrial tariff |
| Power Cost @ 0.08 USD/kWh | 6.74 | USD/day | Standard mining tariff |
| Power Cost @ 0.10 USD/kWh | 8.42 | USD/day | Residential tariff |
| Breakeven Electricity | 0.1014 | USD/kWh | Max rate before loss |
| Hardware Price | 2,055 / 2,380 / 2,804 USD | USD | Market range (min / med / max) |

## Poisson Block Discovery Model & Variance

Solo mining block discovery follows a memoryless Poisson process where every hash attempt has an identical, independent success probability.

- Formula: `P(X >= 1) = 1 - exp(-t / T)`
- `t` is mining duration in seconds
- `T` is mean time between blocks: `T = (Network Hashrate / Miner Hashrate) * Block Time`

Luck percentile table (reference electricity rate 0.08 USD/kWh):

| Luck Scenario | Percentile | Duration | Power (kWh) | Cost @ 0.08 |
| --- | --- | --- | --- | --- |
| 10% Lucky Hit | 10th | 8.8 years | 269,583.9 | 21,566.71 USD |
| 50% Median | 50th | 57.7 years | 1,773,541.9 | 141,883.35 USD |
| 90% Bad Luck | 90th | 191.6 years | 5,891,578.8 | 471,326.30 USD |
| 95% Extreme Drought | 95th | 249.3 years | 7,665,120.7 | 613,209.66 USD |

## Hardware Benchmark Profile

- Device: Bitmain Antminer S21 Pro
- Slug: bitmain-antminer-s21-pro
- Architecture: ASIC
- Algorithm: SHA-256
- Hashrate: 234.51 TH/s
- Power: 3,510 W
- Efficiency: 14.97 J/TH
- Market Cost: 2,055 / 2,380 / 2,804 USD

## Blockchain Network Overview

- Blockchain: Bitcoin (BTC)
- Consensus: SHA-256
- Network Hashrate: 1089.78 EH/s (1.089781e+21 H/s)
- Difficulty: 140,577,680M
- Block Time: 564.7 seconds
- Block Reward: 3.1400 BTC (approx 259,574.38 USD)
- Spot Price: 82,667.0000 USD
- Cost of Production (Flagship): 49,089.65 USD (Bitmain Antminer S23 XP Hyd)

## Tracked Solo Mining Pools

Solo pools for Bitcoin (BTC) routing 100% of block rewards to the miner address:

| Pool Name | Fee | Link | Low Hashrate |
| --- | --- | --- | --- |
| web.public-pool.io | 0% | [web.public-pool.io](https://web.public-pool.io) | No |
| pool.solomining.de | 0% | [pool.solomining.de](https://pool.solomining.de) | No |
| solo.mineshop.eu | 0% | [solo.mineshop.eu](https://solo.mineshop.eu) | No |
| grandpool.io | 0.01% | [grandpool.io](https://grandpool.io/pools/bitcoin) | No |
| luckymonster.pro | 0.5% | [luckymonster.pro](https://luckymonster.pro) | No |
| kano.is | 0.5% | [kano.is](https://kano.is) | No |
| zsolo.bid | 1% | [zsolo.bid](https://zsolo.bid) | No |
| parasite.space | 1% | [parasite.space](https://parasite.space) | No |
| millpools.cc | 1% | [millpools.cc](https://millpools.cc/btc-pool) | No |
| mining-dutch.nl | 1.5% | [mining-dutch.nl](https://www.mining-dutch.nl/pools/bitcoin.php) | No |

## Machine-Readable JSON Summary

```json
{
  "coin_id": "Bitcoin",
  "coin_name": "Bitcoin",
  "ticker": "BTC",
  "algorithm": "SHA-256",
  "hardware_name": "Bitmain Antminer S21 Pro",
  "hardware_slug": "bitmain-antminer-s21-pro",
  "hardware_type": "ASIC",
  "miner_hashrate_h_s": 234514800000000.0,
  "power_watts": 3510.0,
  "efficiency": "14.97 J/TH",
  "network_hashrate_h_s": 1.0897810260135576e+21,
  "difficulty": "140,577,680M",
  "block_time_seconds": 564.732,
  "block_reward_coins": 3.14,
  "spot_price_usd": 82667.0,
  "single_block_value_usd": 259574.38,
  "mean_time_to_block_seconds": 2624287330.1927567,
  "daily_block_probability": 3.2922682184355345e-05,
  "monthly_block_probability": 0.0009872091125731064,
  "yearly_block_probability": 0.011953193760381398,
  "expected_blocks_per_year": 0.012025207619960602,
  "daily_gross_usd": 8.54602549574962,
  "daily_kwh": 84.24,
  "breakeven_electricity_usd_per_kwh": 0.10144854577100688,
  "hardware_price_usd": {
    "min": 2055.0,
    "median": 2380.0,
    "max": 2804.0
  },
  "retrieved_utc": "2026-10-21T18:57:14Z"
}
```

## Provenance & Integration Links

- Retrieved: 2026-10-21T18:57:14Z
- Canonical HTML page: https://backpow.com/Bitcoin/bitmain-antminer-s21-pro
- Coin datasheet: https://backpow.com/Bitcoin.md
- Hardware datasheet: https://backpow.com/hardware/bitmain-antminer-s21-pro.md
- Solo pools directory: https://backpow.com/solo-pools.md
- Live queries over MCP: https://mcp.backpow.com/mcp (tools `calculate_solo_mining_odds`, `get_hardware_benchmarks`)
- Licence: CC BY 4.0 — https://backpow.com/llms.txt