{
  "manageEntity": {
    "action": "Save",
    "entityId": "178133",
    "entityType": "Track",
    "nonce": "0x58e36454ab4fa08757c16a8e1176390266f2e013c552b07186def4f8aa067621",
    "signature": "0xeb1ade4583be73da15ca466887b7bd51e8c45077fa9960cad9ffa03debe36c460f10f4efed66f8730f2e4a625a4bd95909a93817c975ca91f8e14af0c8596b001c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}