{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf9afab728cd9d6e2f82cb055ee912276955a0387bd599276125b252943249584",
    "signature": "0x5b2a1d643bfef513069cddb4b6e2bf8a7a2064afd48b4c80e467cd22066be26a52bbb1ecf189105defcbcc05f3bffe1f5670649746e79bea5ac8955aa46ee8111b",
    "signer": "0x59b2AdB5457e737F50672cfd7783475958BA125c",
    "userId": "663695959"
  }
}