{
  "manageEntity": {
    "action": "Save",
    "entityId": "289441",
    "entityType": "Track",
    "nonce": "0xcb63cc7565e6a4530dc31bc3b3a47530b1eaf044eb54a0b9c224b103e1ef234f",
    "signature": "0x7e295805450b2da9b8283fe39bbc31d1ac8e67d0c1b8f279c0fb91805f0f161c6feb604f4d250e85b632f61b21ad33a85e3287d237d28046db874bbb301ca7671c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}