{
  "manageEntity": {
    "action": "Save",
    "entityId": "668504529",
    "entityType": "Track",
    "nonce": "0xb9baf02dd01dd32b15190323516e7319924eac1e4be7dbbf54f43c2993a8468c",
    "signature": "0x892be8c3bd302e61b532edf4b2ef7f88abad2d674ec577c304171abb162ff223679109883a4266dc0ce71e02e42405c40e7ba6ddc66d720e6fd01c76b49f57c81c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}