{
  "manageEntity": {
    "action": "Save",
    "entityId": "390201029",
    "entityType": "Track",
    "nonce": "0xd004e1d5c0ea1e31afab7de87a79542ff68f504a8741f179a2dc1548ac7e6e0d",
    "signature": "0xac18d8f948f80203bfaf226c72a0de41133be4f0decf300a4551f2205fd016313b32c49f1c6b7b491fa1403206ced838fc91f8b6998cf6a01b9414ea569ad2041c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}