> seems to have the same security guarantees as Bitcoin It doesn't though. While the PoW in a block commits to all its transactions, POST cannot and does not.

> seems to have the same security guarantees as Bitcoin It doesn't though. While the PoW in a block commits to all its transactions, POST cannot and does not. Instead the winning farmer separately commits to the transactions with a signature. Which means that a collusion of all recent winning farmers can rewrite tx history at zero cost. Which is not possible in PoW.