{
  "manageEntity": {
    "action": "Save",
    "entityId": "584485396",
    "entityType": "Track",
    "nonce": "0xac78ecbf72ab9b9fc811dc397f6ee3e5c9e32b96a7772b8e046488ed9d0699ab",
    "signature": "0x8f5f39cdd4a99fd70237fb35f96fb7de0ade315e4f298c1c042a11c0c1a10188650c79ac13a25bdf9283af788c73397ade35af332913874512fe687b6510bc5f1b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}