I got tired of manually calculating my chance of hitting a Bitcoin block with my lotto miner, so I built SoloChance. Hopefully you solo and lotto miners find it useful!
Shout out to CK for his great solo pool, sidehack for his USB miners, and skot with the Bitaxe. Also check out OSMU (Open Source Miners United) Discord.
Did you hit a block? 🤯
If you ever hit a block, please donate something!
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Changelog
Ver 2.0
Feb 2026
New UI — dark & light mode, Simple / Advanced toggle, real-life odds comparisons.
CK Pool server selector (US / EU / AU) and Bitcoin address autofill.
API caching & failover chain for network hashrate with weekly self-updating baseline.
The short version: we don't store anything about you.
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No ads, no data selling. We don't run third-party ads and we never sell or share your data with anyone. We do have one affiliate link to Bitcoin Merch — if you buy through it we earn a small commission. That's it.
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No server-side user storage. Your Bitcoin address (if used for CK Pool lookup) is forwarded to the CK Pool API and immediately discarded — never logged, stored, or retained.
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No cookies from us. SoloChance sets no cookies. Your preferences (theme, mode, last hashrate, unit, tab, server) live only in your browser's localStorage and never leave your device.
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CK Pool address autofill. If you use the CK Pool Lookup tab, your Bitcoin address is saved in your browser's localStorage so it pre-fills next time you visit. This data never leaves your device — it is stored locally in your browser only, just like a bookmark. You can clear it any time by clearing your browser's site data.
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Stats fetched server-side. Advanced stats (BTC price, hashrate, block height, difficulty) are fetched by our server and cached — your browser does not contact CoinGecko or Mempool.space directly when viewing stats.
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Google Analytics (GA4). We use Google Analytics to understand site usage. It collects anonymised data (page views, browser type, approximate country). Google may set its own cookies. Opt out via Google's opt-out tool.
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CK Pool requests. When you use the CK Pool Lookup tab, our server contacts CK Pool on your behalf using only the address you enter. The CK Pool server may log that request per its own policy.