{
  "manageEntity": {
    "action": "Save",
    "entityId": "499526123",
    "entityType": "Track",
    "nonce": "0x1d30ea8c2ce0a8b532c1e536a1f54ce566b960bd64aae525e680dc6005c0309c",
    "signature": "0x47f964ac130549656f5c977a099bd2af18b1ee1e6c1438a8763b5844dcb5577d3474ab994e46c15d051af6f88e90f45800041385b13f430e577c3b51020226351c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}