There is there own eyewitness testimony. What other evidence could their possibly be?
There could be forensic-grade evidence. (DNA specimens, fingerprints, video recordings, etc.) Until such evidence is forthcoming (if ever), one can at best say, in the parlance of historians, "according to some sources, xyz happened."
This so-called "eyewitness testimony" does not meet modern standard for believability. Since we are unable to cross-examine the so-called "witnesses," this amounts to "hearsay evidence."
And even in courts of (criminal) law, the objective of the Prosecution is to prove that someone did something "beyond a reasonable doubt." (in civil cases, a "preponderance of evidence" is considered sufficient.)
In the case of the Resurrection, there is most certainly "reasonable doubt."
Regards,