{
  "manageEntity": {
    "action": "Save",
    "entityId": "576223833",
    "entityType": "Track",
    "nonce": "0xbc2ffcdc08dc82bb1ef8fb1eb43bf1335afb3c76db573ae4e0bfd7f2301c4483",
    "signature": "0xc03cd10f248e7716a62656f448d6c74d92811dbb7dd6b6865aa793b9665544d35855e8b263385443f766832a3e02720678845e977ceee19cf9c53525d42727881b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}