{
  "manageEntity": {
    "action": "Save",
    "entityId": "779920000",
    "entityType": "Track",
    "nonce": "0x0f64f051e5de83369372ea4aa373abf4679d01681562d3db8b67628310009c40",
    "signature": "0x231cb8f63a971b0e450224f4bedd761022dfd3f13c75a1ada8083bf019e0e1ae3c78cb0fd1a1e0e83c61fe98bb7c742a5457e462d8162be584bcc26c783e76bc1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}