{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8dcad10acb7f7c2f1eff3cc74848beeb45982c31c126502f8b3ad26dd661966b",
    "signature": "0x44226fd1e7ebb9da651a9b8539911ae15508ee99e31d95524043458f69870fb83591e85b54f5998f00cedcace272c1aefa927904e6a611509e5654df036df8251b",
    "signer": "0x0DA54f5CCb624226ab4dD99D320d519F2768C28c",
    "userId": "430021018"
  }
}