{
  "manageEntity": {
    "action": "Save",
    "entityId": "323619",
    "entityType": "Track",
    "nonce": "0xbba66043c1bc3188ba62cc8082ddd7f649cb70e4d177d28cba7d1b3363abb524",
    "signature": "0x1723f2337228f2a4c34b1b63e143e6c1c181bd87f54750e9cdfc317c13c3ff4001337881223b671a62465abda7c0c3430f73a01ba0cbbeac88cc994a6519974a1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}