18 lines
829 B
Markdown
18 lines
829 B
Markdown
# LBRY Consensus Algorithm
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LBRY uses [proof of work](https://en.bitcoin.it/wiki/Proof_of_work) as a consensus mechanism, the same way that Bitcoin does.
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LBRY has differences in hash function, block targeting, and difficult adjustment.
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### Hash Mechanism
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```python
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intermediate = sha512(sha256(sha256(data))) # compute the sha512() of the double-sha256() of the data
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left = ripemd(intermediate[:len(intermediate)/2]) # separately ripemd160 the left half
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right = ripemd(intermediate[len(intermediate)/2:]) # and the right half
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proof = sha256(sha256(left + right)) # concatenate the two halves, and double-sha256() it again
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```
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### Block Targeting & Difficulty Adjustment
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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).
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