{
  "manageEntity": {
    "action": "Save",
    "entityId": "953576317",
    "entityType": "Track",
    "nonce": "0xd203bcab12fdbe99f77c72ce9de8e8c266012d50fb16b4f15b72791f5f8a4834",
    "signature": "0x372409600b8703f0b012c5df3bbe29c054304d601d06b7bfc560db1b26772a8f0077e2f5684ef1bfaeda958dca058ffa6c6dcb4d59efef073db0ab838592a9a21c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}