{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616544602",
    "entityType": "Track",
    "nonce": "0xef91717937a5b87c9c47c5527b86a4b6ce8bf87b86dbcec9983e67f4a205640f",
    "signature": "0xdb10db1d067418eda2417eafb2bd744a2d7cb7959bb60d0ccd1d6c151552f1ca3d099037f01a1bce9908c62cd150f249be8082bf361e55c6c22318828cf6a0cd1c",
    "signer": "0x65b2681094e762CAD2349e6C1e2FbC8d54b9c046",
    "userId": "11153747"
  }
}