{
  "manageEntity": {
    "action": "Save",
    "entityId": "1218077493",
    "entityType": "Track",
    "nonce": "0x16852a88a9700073d978b1c40788558bf7687ac9ca3349c28277a511dc6a3a51",
    "signature": "0x7068e0ceff5dd01edaa479fc8424b4ae7cc62abfb2033b7a78575b867deb98443dd56b7f3ca2d5997536de8629f5c94be9e277993e23349905ead64317f5a8f81b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}