{
  "manageEntity": {
    "action": "Save",
    "entityId": "279430385",
    "entityType": "Track",
    "nonce": "0x4f0d1493b596ff31141c428fede3351b4b18a46a075532ecf5fce0e6f87734d4",
    "signature": "0x9367aca207036c91ef488d1c6877d9d073d84e88bb3f79deb449995280bac5a57c250c16c5d80edb0def14ce6dde3e73be855cddd1aae25c36995665eaed9a8b1b",
    "signer": "0x4A3D09CdfD42dE4C57dc67B09a40B5d9172bD69f",
    "userId": "787102835"
  }
}