<p>Yes, it looks like Proof-of-Stake or at least something very similar, and suffers from similar issues, for example:</p>

<blockquote>
  <p>Note that this does not preclude a 2/3 majority of validators from publishing a blockchain fork after they had unbonded and sold their coins to an unsuspecting party. This is called a long-range double-spend attack. A user can
  avoid long-range attacks by syncing their blockchain periodically within the bounds of the unbonding period.</p>
</blockquote>

CC BY-SA 3.0
2017-08-04T02:09:12.903Z
2017-08-04T02:09:12.903Z
meshcollider
<p>I couldn't understand if this tendermint protocol is proof-of-stake or something like proof-of-lock?</p>

<p><a href="https://tendermint.com/static/docs/tendermint.pdf" rel="nofollow noreferrer">https://tendermint.com/static/docs/tendermint.pdf</a></p>

CC BY-SA 3.0
2017-08-03T12:14:32.833Z
What is proof-of-lock? Vlad Zamfir [refers to](https://medium.com/@Vlad_Zamfir/the-history-of-casper-chapter-3-70fefb1182fc) Temdermint as "a security-deposit based proof-of-stake system".
Sergei Tikhomirov
CC BY-SA 3.0
2017-08-04T13:07:39.713Z
@SergeiTikhomirov Since you have to deposit or "lock" your coins I thought maybe it is called something other than PoS. In Ethereum's PoS I think all coins are eligible for PoS, and there is no concept of "locking". Although I didn't research it thoroughly.
EralpB
<consensus><proof-of-stake>
Is Tendermint proof-of-stake?
EralpB
# Is Tendermint proof-of-stake?

(Asked by: username_0 on 2017-08-03)

I couldn't understand if this tendermint protocol is proof-of-stake or something like proof-of-lock?

<https://tendermint.com/static/docs/tendermint.pdf>

**Tags:** consensus, proof-of-stake

> **Comments:**
> **username_1**: What is proof-of-lock? Vlad Zamfir [refers to](https://medium.com/@Vlad_Zamfir/the-history-of-casper-chapter-3-70fefb1182fc) Temdermint as "a security-deposit based proof-of-stake system".  
> **username_0**: @username_1 Since you have to deposit or "lock" your coins I thought maybe it is called something other than PoS. In Ethereum's PoS I think all coins are eligible for PoS, and there is no concept of "locking". Although I didn't research it thoroughly.  

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## 1 answers

### Answer by username_2 on 2017-08-04. Score: 1 | Accepted answer

Yes, it looks like Proof-of-Stake or at least something very similar, and suffers from similar issues, for example:

> Note that this does not preclude a 2/3 majority of validators from publishing a blockchain fork after they had unbonded and sold their coins to an unsuspecting party. This is called a long-range double-spend attack. A user can
> avoid long-range attacks by syncing their blockchain periodically within the bounds of the unbonding period.


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