I'm not sure this is actually useful to cryptolockers. They could use it to sell the private key to a particular public key, but I don't think they can prove th

I'm not sure this is actually useful to cryptolockers. They could use it to sell the private key to a particular public key, but I don't think they can prove that * That public key was used to encrypt the files * Even if they can prove that, prove that the files (aside from maybe one or two samples) will decrypt to the originals.