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+---
+title: What is LBRY's proof algorithm?
+category: mining
+---
+
+## What is LBRY's proof algorithm?
+
+LBRY uses [proof of work](https://en.bitcoin.it/wiki/Proof_of_work) the same way that Bitcoin does. The
+only difference is the hash function. LBRY uses a sligthly different algorithm that achieves the same 
+ends but slightly delayed the development of a GPU miner and gave early adopters a chance to 
+mine without specialized hardware.
+
+LBRY's algorimth is
+
+```python
+intermediate = sha512(sha256(sha256(data)))  # compute the sha512() of the double-sha256() of the data
+left = ripemd(x[:len(x)/2])  # separately ripemd160 the left half
+right = ripemd(x[len(x)/2:]) # and the right half
+proof = sha256(sha256(left + right))  # concatenate the two halves, and double-sha256() it again
+```
+
+For comparison, Bitcoin's algorimth is 
+
+```python
+proof = sha256(sha256(data))
+```