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Blockchain is more difficult to hack, and tends to be more secure than traditional systems, but with enough computing power it is possible that even blockchains could be hacked. So, it is considered very secure but not completely impervious to hacking. One concern in this regard is that since most blockchain networks run the same code, any vulnerability detected could potentially put the whole network at risk. To keep things in perspective, though, most other systems are much less secure and tend to be easier to hack.

To be fully effective, blockchain requires that a large number of providers participate in the process. Without such participation, it loses much of its benefits of multiuser access.

As with most systems, it is also important to determine that data are accurate when first entered into the blockchain ledger. Sometimes, such as when a medical record contains information from multiple sources, it can difficult to determine the “owner” of a piece of information in the first place (e.g., a laboratory result recorded in a medical record, but without the actual laboratory that performed the testing specified).