{
  "manageEntity": {
    "action": "Save",
    "entityId": "1284757872",
    "entityType": "Track",
    "nonce": "0x78d972a6f05d0962e622a4a5d16aa42b6d56950995c09c5b5329897bbfb2c3e1",
    "signature": "0x78fd0cb1b5dd892daa83e1f01db49cd4a50dceca1e2466d964b2a1f19d8b77903be223ebbc5681bd6afa8cf78929c949a968784d0d4af81adc6cc3f6202400491b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}