<p>To my knowledge, neither SHA256 or scrypt have ever had provable instances of hash collisions occur.. However, if this highly unlikely event was to happen, what would that mean for the state of the blockchain? Would it cause consensus confusion since there would be 2 blocks with the same hash that point back to different previous blocks? And/or would it make it best practice to avoid whatever algorithm the collision occurred with? </p>

<p>Just curious,</p>

<p>-Schwifty </p>

<blockchain><mining-theory><hash><block-hash>
Mining Theory: What would happen if a block hash collision occured?
apt-getschwifty
# Mining Theory: What would happen if a block hash collision occured?

(Asked by: username_0 on 2018-07-31)

To my knowledge, neither SHA256 or scrypt have ever had provable instances of hash collisions occur.. However, if this highly unlikely event was to happen, what would that mean for the state of the blockchain? Would it cause consensus confusion since there would be 2 blocks with the same hash that point back to different previous blocks? And/or would it make it best practice to avoid whatever algorithm the collision occurred with?

Just curious,

-Schwifty

**Tags:** blockchain, mining-theory, hash, block-hash


---

## 0 answers

