{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507203802",
    "entityType": "Track",
    "nonce": "0xdf2b28630726f8c76eb33bd4e55aa197923b33f702aca14cbdb32a38799428ae",
    "signature": "0xa633b36089e3e03be2e9f72235fe1a4b70a27fe1cbefe3e09362847b2e13aeba594ee4b1b7005fcd9e4ac631704f9dd3ef6b5a4cb108f72c7a51ea3c9ebae4291c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}