{
  "manageEntity": {
    "action": "Save",
    "entityId": "220790",
    "entityType": "Track",
    "nonce": "0x4f3d7cab138df023f87f46352b36e19cabfb397d4b2fc375b3d989f8a631d38f",
    "signature": "0x1664231fff93550a25915253281c44a9683ce127bc13023bfbf87be1da0e69cb18bf09930fbbbf941d7591ed973729d464de3b57fac4f6dade873db57a8107121c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}