{
  "manageEntity": {
    "action": "Save",
    "entityId": "521386606",
    "entityType": "Track",
    "nonce": "0x1bc301e7fefddf041cc3131df1539b924f61ed3d2dd90266fa16b81bef7a720f",
    "signature": "0x3ef897fa3f49f03965c91faac2174499a5f9279fbc6728fb4d902b598a47dbc3106ef38579c45e16a249f4063d9f5d6b42626588f09bbcdc455eb5ba3d14c2af1c",
    "signer": "0xEeea4f65FD2D7EffBC68176EAbe8544B088Aed57",
    "userId": "584616263"
  }
}