21 lines
932 B
Markdown
21 lines
932 B
Markdown
---
|
|
title: Consensus Algorithm
|
|
description: How does the LBRY blockchain achieve consensus? This resource page will explain.
|
|
---
|
|
|
|
LBRY uses [proof of work](https://en.bitcoin.it/wiki/Proof_of_work) as a consensus mechanism, the same way that Bitcoin does.
|
|
|
|
LBRY has differences in hash function, block targeting, and difficult adjustment.
|
|
|
|
### 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
|
|
```
|
|
|
|
### 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://spec.lbry.io/#consensus).
|