contract ProofOfExistence{
    string public author1= "Davide Carboni";
    string public author2= "Michele Nati";
    string public title  = "A blockchain token for community engagement";
    string public SHA256 = "d9c4208b29ec725280342e5e17baa74920fe142684986ab23f2ae64deced0e4d";
    string public manual = "cat file.pdf | shasum -a 256";

    
}
{"success": true, "error": null, "results": {}}