{
  "manageEntity": {
    "action": "Save",
    "entityId": "1977473595",
    "entityType": "Track",
    "nonce": "0x856edef82e3089fc0efa7d0e46631c986836528f4abdd9539197d7502840fb72",
    "signature": "0x372edf4146051d88fbf35b44204fa9ff869740bfbc6c27f33b82dfec5c7126747b83678c86d3b1ca01bf75d72c3cff549f1eafd45dc014f53292df05ec9a2cfe1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}