# Solo Mining Bitmain Antminer S21 XP on BitcoinCash (BCH)

Machine-readable solo mining datasheet for running **Bitmain Antminer S21 XP** on the **BitcoinCash (BCH)** 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 XP (ASIC)
- Target Network: BitcoinCash (BCH) — Algorithm: SHA-256
- Rig Hashrate: 270.76 TH/s (2.707560e+14 H/s)
- Power Consumption: 3,645 W (87.48 kWh/day)
- Energy Efficiency: 13.46 J/TH
- Network Hashrate: 3.42 EH/s (3.423171e+18 H/s)
- Network Hash Share: 7.909508e-05 (0.007910%)
- Expected Block Discovery: about 4.4 blocks per year (mean time: ~83.7 days)
- Operational Breakeven Electricity: 0.1218 USD/kWh

## Solo Mining Metrics Table

| Metric | Value | Unit | Description |
| --- | --- | --- | --- |
| Mining Device | Bitmain Antminer S21 XP | text | Hardware model name |
| Device Class | ASIC | text | ASIC, GPU, or CPU architecture |
| Device Hashrate | 270.76 TH/s | H/s | Nominal hashrate on SHA-256 |
| Device Power Draw | 3,645 | Watts | Power consumption at wall |
| Energy Efficiency | 13.46 J/TH | unit | Energy per unit hash computation |
| Network Hashrate | 3.42 EH/s | H/s | Total active network hash power |
| Network Difficulty | 474,596M | number | Current consensus target difficulty |
| Block Time (Observed) | 572.2 | seconds | Average interval between blocks |
| Block Reward | 3.1300 | BCH | Full coinbase block reward + fees |
| Coin Spot Price | 285.0500 | USD | Current market exchange rate |
| Single Block Value | 892.21 | USD | Gross fiat value of one block |
| Mean Time to Block | 83.7 days | time | T = (Nethash / Hashrate) * BlockTime |
| Daily Block Probability | 1.19% | percent | 24-hour Poisson chance |
| Monthly Block Probability | 30.11% | percent | 30-day Poisson chance |
| 1-Year Block Probability | 98.73% | percent | 365-day Poisson chance |
| 3-Year Block Probability | 99.99% | percent | 3-year cumulative chance |
| Expected Blocks / Year | 4.3624 | count | Average over 365.25 days |
| Daily Gross Output | 0.037383 | BCH | Expected daily coin yield |
| Daily Gross Value | 10.66 | USD | Revenue before power costs |
| Daily Energy Consumed | 87.48 | kWh/day | Kilowatt-hours consumed |
| Power Cost @ 0.05 USD/kWh | 4.37 | USD/day | Low industrial tariff |
| Power Cost @ 0.08 USD/kWh | 7.00 | USD/day | Standard mining tariff |
| Power Cost @ 0.10 USD/kWh | 8.75 | USD/day | Residential tariff |
| Breakeven Electricity | 0.1218 | USD/kWh | Max rate before loss |
| Hardware Price | 3,249 / 3,550 / 4,535 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 days | 771.7 | 61.74 USD |
| 50% Median | 50th | 58.0 days | 5,076.9 | 406.15 USD |
| 90% Bad Luck | 90th | 192.8 days | 16,865.1 | 1,349.21 USD |
| 95% Extreme Drought | 95th | 250.8 days | 21,942.1 | 1,755.36 USD |

## Hardware Benchmark Profile

- Device: Bitmain Antminer S21 XP
- Slug: bitmain-antminer-s21-xp
- Architecture: ASIC
- Algorithm: SHA-256
- Hashrate: 270.76 TH/s
- Power: 3,645 W
- Efficiency: 13.46 J/TH
- Market Cost: 3,249 / 3,550 / 4,535 USD

## Blockchain Network Overview

- Blockchain: BitcoinCash (BCH)
- Consensus: SHA-256
- Network Hashrate: 3.42 EH/s (3.423171e+18 H/s)
- Difficulty: 474,596M
- Block Time: 572.2 seconds
- Block Reward: 3.1300 BCH (approx 892.21 USD)
- Spot Price: 285.0500 USD
- Cost of Production (Flagship): 156.73 USD (Bitmain Antminer S23 XP Hyd)

## Tracked Solo Mining Pools

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

| Pool Name | Fee | Link | Low Hashrate |
| --- | --- | --- | --- |
| harshy.site | 0% | [harshy.site](https://harshy.site) | No |
| fastpool.xyz | 0.1% | [fastpool.xyz](https://fastpool.xyz/bch) | No |
| luckymonster.pro | 0.5% | [luckymonster.pro](https://luckymonster.pro) | No |
| solohash.co.uk | 0.5% | [solohash.co.uk](https://solohash.co.uk/pool/bitcoincash-solo) | No |
| bitofsin.com | 0.5% | [bitofsin.com](https://pool.bitofsin.com) | No |
| mining-dutch.nl | 1% | [mining-dutch.nl](https://www.mining-dutch.nl/pools/bitcoincashnode.php) | No |
| zsolo.bid | 1% | [zsolo.bid](https://zsolo.bid) | No |
| hashpoolpro.com | 1% | [hashpoolpro.com](https://hashpoolpro.com) | No |
| millpools.cc | 1% | [millpools.cc](https://millpools.cc/bch-pool) | No |
| fenixpool.com | 1% | [fenixpool.com](https://fenixpool.com/pools/mps-bchshasolo) | No |

## Machine-Readable JSON Summary

```json
{
  "coin_id": "BitcoinCash",
  "coin_name": "BitcoinCash",
  "ticker": "BCH",
  "algorithm": "SHA-256",
  "hardware_name": "Bitmain Antminer S21 XP",
  "hardware_slug": "bitmain-antminer-s21-xp",
  "hardware_type": "ASIC",
  "miner_hashrate_h_s": 270756000000000.0,
  "power_watts": 3645.0,
  "efficiency": "13.46 J/TH",
  "network_hashrate_h_s": 3.4231712392572406e+18,
  "difficulty": "474,596M",
  "block_time_seconds": 572.175,
  "block_reward_coins": 3.13,
  "spot_price_usd": 285.05,
  "single_block_value_usd": 892.2065,
  "mean_time_to_block_seconds": 7234015.14212801,
  "daily_block_probability": 0.011872533290756881,
  "monthly_block_probability": 0.30114167524297386,
  "yearly_block_probability": 0.9872521244847314,
  "expected_blocks_per_year": 4.362390647514845,
  "daily_gross_usd": 10.65613495209296,
  "daily_kwh": 87.48,
  "breakeven_electricity_usd_per_kwh": 0.12181224225071971,
  "hardware_price_usd": {
    "min": 3249.0,
    "median": 3550.0,
    "max": 4535.0
  },
  "retrieved_utc": "2026-10-21T18:57:14Z"
}
```

## Provenance & Integration Links

- Retrieved: 2026-10-21T18:57:14Z
- Canonical HTML page: https://backpow.com/BitcoinCash/bitmain-antminer-s21-xp
- Coin datasheet: https://backpow.com/BitcoinCash.md
- Hardware datasheet: https://backpow.com/hardware/bitmain-antminer-s21-xp.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