{
  "manageEntity": {
    "action": "Save",
    "entityId": "1284757872",
    "entityType": "Track",
    "nonce": "0x46dec8399dd7a4c389ce48bafe5b084c9558533210ab4cc083beeabb5cabd715",
    "signature": "0xd1fe13d01543ac53fba066f0abfd5ef0391cac32b02e2b9e16bf1798f5b60f7f18a9884d424a32ebde5d08b876419d41d68b6b7ea1714730132b2dce8cb6e6f81b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}