{
  "manageEntity": {
    "action": "Save",
    "entityId": "779920000",
    "entityType": "Track",
    "nonce": "0xf1a81c30945a4db7d293ef29d07dd599cfab55db54f586105f8b9e279a886f99",
    "signature": "0xd9bf9c55f132385f5073441c2bde694690b53eaf08b17100b2e1ae7189f918245038d17a00508e34be6cc8ffed9c454abe6f22b4b4efbc4ed8b8a1f70fe15dd61b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}