{
  "manageEntity": {
    "action": "Save",
    "entityId": "1474723003",
    "entityType": "Track",
    "nonce": "0x75ea7da2f577a29d2c58cf45b56d0c65f353648dba2b12a49337a399418a2bc2",
    "signature": "0xa1bab6aaaa4775d24823148083cb670bc71a94dcfdaa9135f5bfa0d54c86f1ea2ff46acde126c0f27dfc0696bbb218fc46b669e4472a80b11f8934f222f8a3fb1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}