{
  "manageEntity": {
    "action": "Save",
    "entityId": "812876633",
    "entityType": "Track",
    "nonce": "0x46c46724dd917c392e2b53a9e3c388aa03cfc31fa25919cea487adc81c0399ef",
    "signature": "0x2417ea1867863672f46a0eb3c1f8c7850f3950a0308260c92f61eed25fe4aaaa0e3533bc9364dc3f6357b3b69c095500bb815c7da0855c01b398eb0e72f810611c",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}