# Difficulty Adjustment Countdown

> Learn how a countdown estimates the next Bitcoin difficulty adjustment.

Mode: Runs locally.

## Supported behavior

Block-based countdown. Clock time uses the target spacing; regtest has retargeting disabled.

## Security and privacy

Calculations run locally. Check the network and inputs. Estimates of fees, policy acceptance, prices and future block timing are not guarantees.

[Security model](https://qbitcoin.live/security/index.md) · [QBitcoin home](https://qbitcoin.live/index.md)