{
  "manageEntity": {
    "action": "Save",
    "entityId": "21420016",
    "entityType": "Track",
    "nonce": "0xf7a258ee48d1e2825f210c9e0c271350783f1d7ab996b661a91a7d1a6c1381d9",
    "signature": "0x37b2630d1a94d25b1236d1386b82ab4b86ea7711f4260a497f1ffeb3d3aadca56ca273fdd0344deb50a258b71d98490fa9e4ef6537b2c7ead5ed1a63e1056b551c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}