{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3c4651419be0a3606839824fd9e21b3ee30e62c8e0da4c8591da7970b70b7a9d",
    "signature": "0x01f7ecbbfee0db8132abd72e9d4d47e7a91934955880d467effdd4bf68a923794cf1558e88eb11bebd54d84bfe22ac1712e8a7cc3438928c92ae79bd18101fdf1c",
    "signer": "0xe8BAaf9d67869BFe993951C60524b67BC331bac9",
    "userId": "75683930"
  }
}