{
  "manageEntity": {
    "action": "Save",
    "entityId": "1938231301",
    "entityType": "Track",
    "nonce": "0x7fde4e735ac1293015b4e83166e7742d1c5bbaae906b828f06d83a6b31c37bc1",
    "signature": "0x2a16d559add6f11a5a270260852cd0d69e26ab0e3c8750bb6f26c994f67db02e46a6431194982075ad1797a9bf77ee5707aa890735ec4883652e6937289315d31b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}