{
  "manageEntity": {
    "action": "Save",
    "entityId": "529815177",
    "entityType": "Track",
    "nonce": "0x8786f50861fe5544f0668260d51d23e9abc209340dcae0fc9cebb2846bb309bd",
    "signature": "0xbcc9a084268aad923f92f0bc7e82ef695a287ea52d19424e830e1af021f5533148ef4f0320fa9e490aeee75c527e8a5d56ca1efe3c9e07a12b0be9e35b53fd3a1c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}