{
  "manageEntity": {
    "action": "Save",
    "entityId": "521147",
    "entityType": "Track",
    "nonce": "0x9d10227ccfb253a670efcb32d20a5f0f1f6a92bd55e0db85e82283c69bf346d2",
    "signature": "0xc20430bf07618bee0e2534ea9b507ffd0c12d38dc9aca8550861caf43bfa1ece3ecf8511719b61f75ee58043ce550cb12bf7cd92a46e9b5a0f7e7ffd13f9fa3e1c",
    "signer": "0x647f7C07Bb90cCeC21Bbf4C1Ed89df3Bf5020eF5",
    "userId": "879984932"
  }
}