{
  "manageEntity": {
    "action": "Save",
    "entityId": "193303",
    "entityType": "Track",
    "nonce": "0x4667f5ba1e243ccabf0ecd7e0c75e2c33aaafc45b7422f73c851ff515b40153d",
    "signature": "0xcd9077aec29b7255352309fc5661dcaf0df0ca19958fe5da2ec28cb4cf67bcab1a4acc246e292d1aa7ea99f601e2f6e579791799c60a3ffc83a27f8ef39603d91b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}