{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd5f3c7371540ee2f00ffa042607bc8ffedc4391defc5beb2e6b6d80653491dca",
    "signature": "0xf956c5afbe7c32ece226ffbd8edddaf442ce326ecab66a12820accefb3606d875a5361825f9f23df641caf08b82978a9d3f33fee399dd01f40943ca44ba077941c",
    "signer": "0x003D52a670b490138D452ace63b8C15Fb6D5339c",
    "userId": "266958082"
  }
}