Security expert Bruce Schneier has been warning of an ongoing problem: The supply chain is insecure.

Consumers aren’t willing to pay for security features or upgrades, while product manufacturers aren’t as strict as they could be in safeguarding the integrity of every single component that goes into the systems we use.

It’s been cheaper to fix hacks after they happen and to ask for forgiveness, rather than to address the problem in advance. But as hackers grow more sophisticated and as more of our appliances, systems and databases are connected, we ought to think about the downstream implications of insecure supply chains in our infrastructure, hospitals, power grids—even our kitchens.

Some hope that wider adoption of blockchain and distributed ledger technology will help solve these problems, but as of now, there aren’t scalable solutions.