We live in strange times. I had always believed it was a fake and hadn't looked into the science.
Turns out it is authentic and can't be understood nor replicated.

I've never read the Bible, so I don't know what their official cause of death is. But part of dying on a cross /from a bad beating is heart failure.

Around the same time I came across the Shroud info, I investigated the bloody hosts/eucharist miracles, which is where the white bread that Catholocs eat literally turns into flesh and blood and has been scientifically examined.

The various miracles all have stuff in common - heart tissue, white blood cells that is still living / dead, evidence of trauma / physical beatings, AB blood type, etc.

It really confused independent labs because they thought they were looking at a murder but it was just the bread.

After studying the eucharist, some scientists converted because it is scientifically impossible yet still exists.

And now we have a vaccine that causes heart damage and heart attacks.

I don't know what it means, but for ages there has been a religious focus on the sacred blood of Jesus, the sacred heart of mary, all about the heart.

Here is a podcast, I think by a protestant with a priest talking about the shroud. Tons of good info.

https://www.youtube.com/live/HAbuG-oVq1Q

Basically, the shroud is one of a kind and does not show that the body ever corrupted or decayed.