{
  "manageEntity": {
    "action": "Save",
    "entityId": "802965",
    "entityType": "Track",
    "nonce": "0xc181776436c7794ce601b958e4f2144d9c9dd6f57de18fddc2a9645ad9c71a38",
    "signature": "0x1c5a8bc097fdad06b92c96f2175cdfa7a7ce6ee1364a75f9315ecc9c76996e7f19fd6eccc6a54537f75d9f388a0541d089fbc1a7e355a45a7f71a46a94c0c3571b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}