{
  "manageEntity": {
    "action": "Save",
    "entityId": "258257666",
    "entityType": "Track",
    "nonce": "0x9db14b2039148d9d645899ae7633e8b2bda2362992c1d5d55d254fd99a6024a5",
    "signature": "0x2778ac77007d14774c5c0f75a75bccc1f0d1831b9d9f4ad2cb91ec9c4e7ddce66cf1e5c66a089b88b69e3d521a4a7824b6dddda6bb88f5ee9676f8446c20d9731c",
    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}