How the Bitcoin Halving Could Affect Network Security
Briefly

There are potential security risks due to the possibility of smaller miners withdrawing from the market as rewards are halved, leading to reduced hash rates and overall security.
It is estimated that 51% of the hashing power within the protocol architecture may be vulnerable to attacks.
Previous halving events have had minimal impact on overall network security, and many analysts predict a smooth transition for the network itself.
The halving reduces the rate at which new bitcoins are created, impacting miners financially unless the BTC price rises proportionately.
Read at Coindesk
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