{
  "manageEntity": {
    "action": "Save",
    "entityId": "135423381",
    "entityType": "Track",
    "nonce": "0x8c11e22abc62e67d06196bb4a3847e92cb1bdfeac05dcb91766e4d181bd879f2",
    "signature": "0x6b287f278c79214117a0abe20a82a011c0ad8b00c2f731e84a442bd82aa757834dec3d5a24c25855901b1f3e6aea30c7cfe50a8d5f75120b6225c22055d1d0631c",
    "signer": "0x4a26E1fdd6FdeE62e6A343d231CF3700Bf1e26bb",
    "userId": "55875"
  }
}