{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638584898",
    "entityType": "Track",
    "nonce": "0xc3b6f7a86c7be0a32f1306db9ff120040572fae1c560d59b6d193472c5b03bb9",
    "signature": "0xb7baaf37a4fdc6114b9dc9bbfeed87a20d3b2a002d19f2ee7236f8dc45909c315e268bbbd805ba61c5facf56aa06f0dc277e02cf7ad816e0bfaf0e09dbd869d51b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}