What is the point of that base64 string at the top? In the context of the article, I thought it would be a signature of "Craig Wright" or "Craig Wright, Satoshi

What is the point of that base64 string at the top? In the context of the article, I thought it would be a signature of "Craig Wright" or "Craig Wright, Satoshi", but it's only a base64 encoded string of one the earlier things he wrote: % base64 --decode <<EOF IFdyaWdodCwgaXQgaXMgbm90IHRoZSBzYW1lIGFzIGlmIEkgc2lnbiBDcmFpZyBXcmlnaHQsIFNhdG9zaGkuCgo= EOF Wright, it is not the same as if I sign Craig Wright, Satoshi.