{
  "manageEntity": {
    "action": "Save",
    "entityId": "570197362",
    "entityType": "Track",
    "nonce": "0xd49d6f4a9087db6c04d90b2963d104ad9c3c06d574e58b6ab291d8a03208dc17",
    "signature": "0xb8eb2ce934573bad62787e44e7b1696a5f9629183768be3e1af40b1d97b4d67c10b2c7384813f487a132c4223234166ed70a6db0444c3b85c6f2434cfd1383c11b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}