{
  "manageEntity": {
    "action": "Save",
    "entityId": "301108",
    "entityType": "Track",
    "nonce": "0x679cbe3a249ea16da981055fb58ecbac87215dda1366b2d3b1783968c63e0cd8",
    "signature": "0x9915bd8002bcf20bea970de95aff4657736815df9352ac51cb350234be3c29d25620ca9e23ed5403af328b3c6159952705b4fac0e3817e3e52010f99960363d41b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}