{
  "manageEntity": {
    "action": "Save",
    "entityId": "1028619",
    "entityType": "Track",
    "nonce": "0xb5b01961f73af6df08599c30153f6b2cd7ea6aa745492e92d380a8cd41841d97",
    "signature": "0xd7349632377490e16552fc11ca42b47d219c99c7b74b111dd1da4a37f1ba365f7663e24191d53f6beb15f8d41ce54d4f6f0b440033b1e38d0e02bfd6dce5f9c61c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}