{
  "manageEntity": {
    "action": "Save",
    "entityId": "650210621",
    "entityType": "Track",
    "nonce": "0xd9cc5728889e321d8b1344407ce84c77707c3ea4acf747e87e8c586123eb0d98",
    "signature": "0xa0a6c067cad36700cb59f3018ff587d2e68081d2b4c4377bd63a8c760941f559177bb1f20a6ca0d5358ab349d69c61c8e86810c5e6d5898a956da9e978fb0a661b",
    "signer": "0x1C0B6B9D9E4D9c6ef70504f510515Ac9A17339Ab",
    "userId": "251570945"
  }
}