---
name: preciousblock
btcversion: 24.0.0
btcgroup: blockchain
permalink: en/doc/24.0.0/rpc/blockchain/preciousblock/
---

preciousblock "blockhash"

Treats a block as if it were received before others with the same work.

A later preciousblock call can override the effect of an earlier one.

The effects of preciousblock are not retained across restarts.

Arguments:
1. blockhash    (string, required) the hash of the block to mark as precious

Result:
null    (json null)

Examples:
> bitcoin-cli preciousblo