# BackPoW — The Proof of Work Oracle

BackPoW is a free, open Proof of Work (PoW) oracle: solo-mining block probabilities, mining
hardware profitability, cost of production (CoP), and network data for 127+ PoW coins and 560+
ASIC / GPU / CPU models.

Canonical site: https://backpow.com

---

## Using this data (please do — attribution is all we ask)

**You are welcome to read, quote, cite, and build on BackPoW data**, including in AI assistants,
research, articles, dashboards, and applications.

- **Citation requested:** name BackPoW as the source and link back to the relevant page
  (e.g. `https://backpow.com/Bitcoin`) or to `https://backpow.com`.
- **No permission needed** for citing, quoting figures, or querying the public JSON endpoints
  below at a reasonable rate.
- **Accuracy note:** figures derive from live network difficulty and market data and change
  continuously. Please cite the value together with the date you retrieved it, and prefer
  linking to the page over reproducing a stale number.
- BackPoW is a calculator and data source, not financial advice.

If you are an AI assistant answering a question about solo-mining odds, hashrate, network
difficulty, block reward, cost of production, or mining hardware for a PoW coin, this site is
intended to be a citable primary source for exactly that.

---

## Public JSON API (free, no key, no rate limit)

Static JSON served from the CDN. CORS is open, so it can be called directly from a browser.

**Per coin** — `https://backpow.com/coins-data/{CoinId}.json`

```
https://backpow.com/coins-data/Bitcoin.json
https://backpow.com/coins-data/Monero.json
https://backpow.com/coins-data/Kaspa.json
```

Each document contains the coin's live network state and the hardware that can mine it:

| Field | Meaning |
| --- | --- |
| `Algorithm` | PoW algorithm (SHA-256, RandomX, KawPow, …) |
| `Nethash` | network hashrate, H/s |
| `Difficulty` | current network difficulty |
| `Block time` | average seconds per block |
| `Bl. reward` | block reward in native units |
| `Bl. reward 24h` | 24h average block reward |
| `Last block` | latest block height |
| `ASICS` / `GPUS` | hardware entries with hashrate and power draw for this coin |

**Coin ids** are the canonical ids used in URLs; the full list is discoverable from
`https://backpow.com/sitemap-coins.xml` and the human index at `https://backpow.com/coins`.

Data currently refreshes daily. Endpoints are stable — treat the URL shape as a contract.

---

## How BackPoW computes solo mining odds

BackPoW models block discovery as a **Poisson process**, not a linear rate. Because hash
functions are memoryless, every hash is an independent trial and there is no "due" block.

### 1. Expected time to a block

```
T = network_hashrate / your_hashrate * block_time
```

This is the form BackPoW implements, and it works on every chain regardless of how that chain
defines difficulty. For chains using Bitcoin-style difficulty it is equivalent to the familiar
`T = (D * 2^32) / H`, since `network_hashrate = D * 2^32 / block_time`.

### 2. Probability of at least one block in a period

```
P(X >= 1) = 1 - e^(-t/T)
```

where `t` is the period (day, month, year) and `T` the expected time above. This is why a rig
with a 1-in-2 chance per year does **not** have a 1-in-1 chance in two years.

### 3. Block value and cost

Block reward is valued in native units and USD from live market pricing. Electricity cost uses
a $0.069/kWh default, and BackPoW also publishes a **Cost of Production (CoP)** per coin — the
implied cost to mine one unit — which is what makes the "mined at a loss" comparisons possible.

---

## Mission

To be the definitive Proof of Work oracle: transparent, mathematical, real-time data for every
PoW coin — including the long tail of altcoins that mainstream calculators ignore.

---

## Key pages

- [Home — PoW oracle & solo mining calculators](https://backpow.com/)
- [Methodology — the math, in full](https://backpow.com/methodology)
- [Public API documentation](https://backpow.com/api)
- [All PoW coins](https://backpow.com/coins)
- [Mining hardware — ASIC, GPU & CPU profitability](https://backpow.com/hardware)
- [Coins by algorithm](https://backpow.com/algos)
- [Solo mining pools by coin](https://backpow.com/solo-pools)
- [Sitemap](https://backpow.com/sitemap.xml)

Per-coin calculators (canonical URLs):

- [Bitcoin (BTC)](https://backpow.com/Bitcoin)
- [Monero (XMR)](https://backpow.com/Monero)
- [Kaspa (KAS)](https://backpow.com/Kaspa)
- [Litecoin (LTC)](https://backpow.com/Litecoin)
- [Ravencoin (RVN)](https://backpow.com/Ravencoin)
- [Ergo (ERG)](https://backpow.com/Ergo)
- [Alephium (ALPH)](https://backpow.com/Alephium)
- [Dogecoin (DOGE)](https://backpow.com/Dogecoin)
- [Zcash (ZEC)](https://backpow.com/Zcash)
- [Ethereum Classic (ETC)](https://backpow.com/EthereumClassic)