# Fractal (FB) — Solo Mining Pools & Network State

Live solo mining pool comparison, network difficulty, block reward structure, and Poisson solo mining probabilities for Fractal, as measured by BackPow.

## Network Overview

| Metric | Value | Unit |
| --- | --- | --- |
| Algorithm | SHA-256 | |
| Network hashrate | 1.2970583009637149e+17 | H/s |
| Difficulty | 1185000000.0 | |
| Difficulty, 24h average | 1308000000.0 | |
| Difficulty, 7d average | 1235000000.0 | |
| Block time, observed | 45.0 | seconds |
| Block reward | 6.25 | FB |
| Spot price | 0.383529 | USD |
| Block value | 2.39705625 | USD |
| Market cap | 42230775.0 | USD |
| Tracked solo pools | 11 | count |
| Recommended solo pool | jackpool.ru (0.5%) | |

## Tracked Solo Pools

| Pool | Solo Fee (%) | Avg Hashrate 7d (raw) | Avg Hashrate 7d | Reliability | Pool URL |
| --- | --- | --- | --- | --- | --- |
| jackpool.ru | 0.5 | 816549468794082.9 | 816.55 TH/s | OK | https://jackpool.ru/#fb_sha256 |
| mining-dutch.nl | 1 | 367033941347929.1 | 367.03 TH/s | OK | https://www.mining-dutch.nl/pools/fractalbitcoin.php |
| pool.kryptex.com | 1.5 | 28957942143727820 | 28.96 PH/s | OK | https://pool.kryptex.com/fb |
| kardanpool.com | 1.5 | 1370855958696135.5 | 1.37 PH/s | OK | https://kardanpool.com/fb |
| hashpoolpro.com | 2 | 2047775517449704.2 | 2.05 PH/s | OK | https://hashpoolpro.com |
| molepool.com | 2 | 1506396140362721.8 | 1.51 PH/s | OK | https://fb.molepool.com |
| solopool.org | 2 | 1225928645294083.2 | 1.23 PH/s | OK | https://fb.solopool.org |
| bcmonster.com | 1.5 | 3500272124260.356 | 3.50 TH/s | Low hashrate | https://bcmonster.com |
| public-pool-btc.ru | 1.5 | null | — | Low hashrate | https://public-pool-btc.ru |
| himpool.com | 2 | 210675932798698.16 | 210.68 TH/s | Low hashrate | https://himpool.com/pools/fb-solo |
| solopool.site | 2 | 92348531745195.36 | 92.35 TH/s | Low hashrate | https://solopool.site |

## Expected Time to Solo Mine a Block (Poisson Model)

Block discovery is modeled as a memoryless Poisson process: `P(X >= 1) = 1 - exp(-t / T)` where `T = (Network Hashrate / Miner Hashrate) * Block Time`.

| Hardware / Scenario | Hashrate (raw H/s) | Hashrate (display) | Expected Time | 30-Day Probability |
| --- | --- | --- | --- | --- |
| 1× Bitmain Antminer S23 XP Hyd | 600300000000000.0 | 600.30 TH/s | 2.7 hours | 100.0% |
| 10× Bitmain Antminer S23 XP Hyd | 6003000000000000.0 | 6.00 PH/s | 16 min | 100.0% |
| 100× Bitmain Antminer S23 XP Hyd | 6.003e+16 | 60.03 PH/s | 2 min | 100.0% |

## Solo Mining Protocol Rules

- Direct Coinbase Payout: When a solo miner finds a block, the pool constructs the block template with the miner's payout address directly in the coinbase transaction.
- Con Kolivas' Solo CKPool: Regarded as the historical benchmark for Bitcoin solo mining. Its pure C daemon processes shares with zero database overhead and pays miners directly through coinbase transaction outputs.
- Maturation: Newly minted coins require confirmation maturity (typically 100 blocks on Bitcoin and most PoW networks) before they can be transferred or spent.
- Pool Fee Structure: Unlike PPS/PPLNS pools that deduct fees from shared round rewards, solo pools deduct their percentage fee exclusively upon block discovery.
- High Variance: Finding blocks solo is subject to Poisson variance; expected time is a mathematical expectation over many trials, not a countdown timer.

## Provenance

- Retrieved: 2026-10-16T08:56:28Z
- Canonical page: https://backpow.com/solo-pools/Fractal
- Coin economics & CoP datasheet: https://backpow.com/Fractal.md
- All solo pools directory: https://backpow.com/solo-pools.md
- Solo mining odds calculator: https://backpow.com/Fractal
- Live queries over MCP: https://mcp.backpow.com/mcp (tools `calculate_solo_mining_odds`, `get_coin_oracle`)
- Licence: CC BY 4.0 — https://backpow.com/llms.txt

Difficulty, hashrate and price move continuously. This file is a snapshot taken at the time above; for a current reading, query the MCP endpoint rather than caching this document.