Blockchain removing invalid transactions Currently, I have the following architecture:

Multiple honeypots for VoIP which detects voice attackers.
These honeypots collect IP and SIP information.
Using a Publisher/Subscribe model (Observer pattern), Publisher notifies clients or subscribers, about attackers in order to update their infrastructure firewalls or by adding VoIP rules blocking attackers dialed number. Example:

I detect an IP from France is scanning my network trying to place calls to a number in Dubai. I notify agent which in turn will update firewall access list and my VoIP software to create a block rule to that destination.

As I want to partner with other companies, my goal is to have a shared database where we can access the information we are collecting, the risk is that as it grows, attacker can insert valid IP addresses or valid numbers, (Example block IPs from our major ITSP, or block the number to our most important customer)
While a whitelist can easily solve this issue.

What I would like to know is if Blockchain will be a valid use case where information containing only suspicious IPs and dialed Telephone numbers/SIP URIs are validated by all parties and shared. I started a prototype based on this Blockchain.

The idea is that each Honeypot submits a transaction with IP/SIP attacker data. The transaction is mined and added to blockchain. But how can I remove an IP which is no longer valid? Any suggestions?

Flow:

1) Honeypot detects attacker

2) Honeypot submit new transaction to Blockchain:

curl "localhost:5002/transactions/new" -H "Content-Type: application/json" -d '{"sender": "honeypot-2", "recipient":"twilio", "amount": 111, "hosts": ["192.99.38.121"]}'


3) Transaction is mined.

curl "localhost:5002/mine"


4) It is detected that 192.99.38.121 is no longer a threat, how to remove it from blockchain securely?
A transaction cannot be removed from a blockchain without recomputing the block that contains that transaction and all blocks that came after it. The best you could do is to have a transaction that nullifies the transaction that inserted the data.