{
  "manageEntity": {
    "action": "Save",
    "entityId": "546181620",
    "entityType": "Track",
    "nonce": "0x376ac4d988d4a4594d354a910f3ab89383c5375d00084befd8bedc7a5cc2b688",
    "signature": "0xd2971cf4eef58107cee3dc515945fc86a01ac6717cf5c5c75cb8ef764d9c1af6690852708bac36be4c56ec38803692f6a45a4059f02b31db0b6f53aaebc9110c1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}