{
  "manageEntity": {
    "action": "Save",
    "entityId": "591659",
    "entityType": "Track",
    "nonce": "0x13d4b0638c50a8c15c000734161c0dbbaa1c6edd02c4bec2b9798e90ee1b765c",
    "signature": "0x1a4fc1ceb2a1f3df72e912343569665dcaf0e07f6cb2598a5efaebb0c3dfa3947d4fc6ffa93ebc885161f881174ef7f0a6c0f269460066c495931a9d856933dc1c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}