{
  "manageEntity": {
    "action": "Save",
    "entityId": "303432300",
    "entityType": "Track",
    "nonce": "0x3b7e02c6503304e52073cfb366128c26ff60446e47bde4f17e25321585f8806b",
    "signature": "0xc512d7c2b68ab89099673cda4f4c0be7bfd7532bf8b8bfbeb1f27c644dc5dbbc1b010ebd891ad390edaf7a46b2070faab3424c20e72c9c6d835e18777017235d1b",
    "signer": "0xa122b637564a43022Fcc9233444795670a027d5F",
    "userId": "836851370"
  }
}