{
  "manageEntity": {
    "action": "Save",
    "entityId": "544484",
    "entityType": "Track",
    "nonce": "0x85c5e9b00c4a069df92f8fd31803d3e16ac5edd6e19e32a1238d906585ab84cb",
    "signature": "0xb50470bb9474afdf96c412eebb69588355901041a35c311c9e24fbbbb95e1c15003fd4109bb4a0f1949aa3390e60ebeea78212ea98ee1acb6f6dda6bf4e45fe11b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}