user48281: 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

user51948: 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.


48281: <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>
 51948: <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>
