Start with the failure mode nobody plans for. You made the decision. You signed up, you sorted the funding, you talked it through with your family. And then, at the only moment that counts, a missing or unsigned piece of paper stalls everything, and the preservation that everyone knew you wanted does not happen. This is not a hypothetical we invented for emphasis. We have watched it occur: a clear intention, defeated not by science or money but by documentation that was never finished. It is the most preventable way this can go wrong, which is exactly why it deserves a whole article.
The reassuring part is that the fix is cheap, finite, and entirely within your control today. Four documents do almost all the work. Once they exist, are signed, and are findable, the legal path is clear and the people around you cannot be overruled by a hospital, a relative, or the clock.
The four documents that actually matter
Your biostasis contract. This is the legal authorization for us to preserve you. Without it, a hospital will not release your body and we cannot proceed. There is no workaround and no grace; it is the foundation the other three documents support. This is the same contract you sign digitally during the sign-up process.
Patient advance directive. This tells medical staff what you want when you can no longer speak for yourself, and it explicitly authorizes cryopreservation even over family objection. Requirements differ by country, so it must be valid where you actually live, not merely well-intentioned. This is your voice when you have lost the ability to use it, which is why it ties directly into informed consent.
Your will. It needs to mention cryopreservation explicitly. Doing so closes the door on family disputes and makes your wishes legally unambiguous; leaving it out invites relatives to challenge everything while the irreplaceable minutes run out. The will is not how you fund preservation, that is a separate and important point in setting up your funding method, but it is where you state intent in the most durable legal form available.
Funding documentation. If you are using life insurance with Tomorrow Biostasis GmbH named as beneficiary, you are covered and there is little more to do. If you are using estate assets or another arrangement, document it clearly so that, when a case begins, we can confirm payment is secured without delay. The reason this urgency exists, and why a will alone fails as funding, is explained in why family-funded preservation at death is risky.
Where to keep them
Keep both physical and digital copies. Store them somewhere your closest people can reach immediately, not in a safe-deposit box that only opens after a death certificate, and upload them to your Member Zone so our team has them on file. The test is simple: if the people who would act on your behalf cannot lay hands on these papers within an hour of needing them, they are not yet stored well enough.
Why this cannot wait
There is a hard asymmetry here. You cannot sort any of this out after you are gone; it has to be done now, while you can sign your own name. The good news is that it is genuinely not complicated. Get the templates from tomorrow.bio/documents, work with a lawyer if your situation needs one, get everything signed, store it in the two places above, and tell the people who matter where it all lives. An afternoon of effort removes the single largest non-scientific risk to your preservation. The wider legal context, for the curious, is in the legal framework for cryonics in the EU.
The most common way a clearly-wanted preservation fails is not science or money; it is a missing signature, and that is the one risk you can erase completely in a single afternoon.
Your future self, if the bet behind biostasis pays off, will be grateful you treated a few hours of paperwork as seriously as the decades-long decision it protects. Do it now, while doing it is still possible.