{
  "manageEntity": {
    "action": "Save",
    "entityId": "1386784572",
    "entityType": "Track",
    "nonce": "0x08f495ec81036bdce6fbea78450a53f7951fe4f15292dbbeca5acbaa5bfb5a00",
    "signature": "0x8a3e23b714ace0cfa325f3a72ebcf46cdc5b59fc7f4abdd84115a8e84985f928308519b88a140eeb1dead53bd6622ec790755ffe9d91009a26381939044d653f1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}