Mitigating blockchain attack

A computer system to detect malicious attacks presenting a threat to a blockchain associated with a blockchain data structure, the computer system comprising:

• a processor device and a data store, wherein the processor device is configured to:
• define a transaction creation profile according to which transactions can be generated and submitted to the blockchain;
• submit a transaction to the blockchain, the transaction causing the generation of a profiler data structure in the blockchain including executable code to generate profile transactions to be submitted to the blockchain according to the transaction creation profile;
• monitor the blockchain to identify profile transactions based on profile transactions submitted by the profile data structure generated in the blockchain;
• and
• compare identified profile transactions with the transaction creation profile to detect a deviation from the transaction creation profile, such detection corresponding to a malicious attack occurring with respect to the blockchain.