{
  "manageEntity": {
    "action": "Save",
    "entityId": "391333",
    "entityType": "Track",
    "nonce": "0x85383d35bd3cfbbcb50bd42d3c8c24343b8a220c6ad1345350747ce38bef49a2",
    "signature": "0x6b5cf9f5a67b10c92ab566be68c03949983fe8282fb6cb408c3e1f56f18500a055bd404391dc31c6a74ff1c699dc378cf42dd886709a589437a3e02c58a55a7e1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}