The Church of the Holy Innocents is in Manhattan. They have a shrine right in the church, and the book of life is right there. Here is the link to register your baby.
I had the blessing to visit NYC after I had registered my unborn baby in the book. It was really special to be able to pray at this shrine, knowing that my child's name was in that book.
Another thought on the blighted ovum. You can't find a medical person to say anything beyond the label "blighted ovum." I spent a long time trying to find an answer - to see if someone could say whether or not a distinct baby is created in this case. And there were no answers. They just don't concern themselves with what happened at conception - all that matters to them is that there is no trace of a baby at the time they are able to observe the sac, which is of course, weeks after conception. So when you ask a doctor, "was there ever a baby" and get the repeated answer "it's a blighted ovum," the reality is that they don't know if there might have been a tiny baby, that died while it was only a few cells large. And depending on their perspective, they probably don't even consider it a baby as early as we do - so really, they may not even understand the question you're asking.
And the spiritual question is this: at conception, there is only one cell right? There is no baby and separate sac, it is all one. So we ask, when the sac did form, did it immediately form without a baby? Or was there a tiny baby inside the sac, if only for a few moments or days? Or did the fertilzed egg only develop into an empty sac, and never (even for a few moments) have anything else (baby) form from it? If the second is true, did God still give that fertilzed egg a soul? Do we still call it a baby? These are the questions I wrestled with for 5 years. And my conclusion, though not certain, is that we say that life begins at conception. We say that lacking any other evidence, we believe that conception is the moment when God gives the soul to the new life. So given what we know so far about this topic, it is likely that this tiny life did have a soul. We can't know for sure, but I would rather err on the side of "yes" than "no." That is why I named my baby. In my uncertainty, I told God that if I was wrong, and if there really was no baby, would he please assign this name (along with my spiritual motherhood) to another little baby who wasn't named and didn't have someone praying for it - perhaps an aborted one.