{
  "manageEntity": {
    "action": "Save",
    "entityId": "977565882",
    "entityType": "Track",
    "nonce": "0x0788ae77a1509e3761635594717a3857a2d64348aded4fabf176a641f38d3f5f",
    "signature": "0x9f0278918fe4924e507b5034c66f0f867890aa29d87955287fe6f14625a9cf3a13a8588512e27c47e2cec6a8e330b1d2bd510ba2d4244800365ebea951d1ff491b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}