Glossary: Difficulty

Glossary: Difficulty

Glossary
2 min readUpdated: 20. January 2026 · By Hugo

One-Sentence Definition

Mining difficulty is a measure of how computationally hard it is to find a valid hash below the target value when mining a new block.

Why It Matters for Solo Mining

Mining difficulty directly determines your chances of finding a block as a solo miner—higher difficulty means you need more hash power to compete. When Bitcoin’s mining difficulty is at all-time highs, your odds of solving a block with a single ASIC drop dramatically compared to when the network was smaller. Understanding current difficulty helps you calculate realistic expectations for how long you might wait between successful blocks.

How It Works

The network adjusts mining difficulty to maintain consistent block times—Bitcoin targets 10 minutes per block, for example. When miners add more hash power to the network, blocks get found faster, so the difficulty adjustment kicks in to make the puzzle harder. Technically, difficulty controls the target value that your block header hash must fall below using algorithms like SHA-256.

Higher difficulty means the target gets smaller (numerically lower), so fewer possible hash outputs qualify as valid blocks. Your mining hardware tries billions or trillions of different nonces per second, but only hashes below the target count as winning solutions. The difficulty number you see reported is actually a ratio comparing current difficulty to the easiest possible difficulty (which was 1 when Bitcoin started at the genesis block).

Example

Think of mining difficulty like a combination lock where the network keeps adding more digits. Early Bitcoin miners were spinning 4-digit locks—easy to crack. Today’s Bitcoin mining difficulty is like a lock with 20+ digits, requiring massive computational power to find the right combination. If Bitcoin’s difficulty is 50 trillion, it’s 50 trillion times harder to find a block than it was on day one. When you solo mine Litecoin with Scrypt at lower difficulty than Bitcoin, you’re essentially working with an easier puzzle, giving you better odds of finding blocks with less hardware.