{
  "manageEntity": {
    "action": "Save",
    "entityId": "1395424991",
    "entityType": "Track",
    "nonce": "0x5c3dc226178e31371aedb056613c4fec9291e63bf2a318a43e12999940a1e539",
    "signature": "0xca32400e2283df1b15d55f52a47b39bf8a4ebf37be2a99ddff988ba0760c45db66017a63e2a0334fd2ab4c4bf363f800be4902c19ee07760d5fc3199218fa8151b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}