lbry.tech/documents/resources/consensus.md

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---
title: Consensus Algorithm
description: How does the LBRY blockchain achieve consensus? This resource page will explain.
---
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LBRY uses [proof of work](https://en.bitcoin.it/wiki/Proof_of_work) as a [consensus mechanism](/spec#consensus), the same way that Bitcoin does.
LBRY has differences in hash function, block targeting, and difficulty adjustment.
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### Hash Mechanism
```python
intermediate = sha512(sha256(sha256(data))) # compute the sha512() of the double-sha256() of the data
left = ripemd(intermediate[:len(intermediate)/2]) # separately ripemd160 the left half
right = ripemd(intermediate[len(intermediate)/2:]) # and the right half
proof = sha256(sha256(left + right)) # concatenate the two halves, and double-sha256() it again
```
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### Block Targeting & Difficulty Adjustment
The targeted time of each LBRY block is 2.5 mintues (150 seconds). More information and links to source code [here](https://lbry.tech/spec#consensus).