{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc6f20ca1715a2039c339ca159d2821eb14542a1bd1db8b7df630fde930a34afc",
    "signature": "0x37c2967108c8c933002411a1044184415162fbf8da74ce154575d4813ea375b171cb5e0541d5ac5d27fd755dccf5d6fdb9f0de69c6b267e6bed69ec5d33ed0d21b",
    "signer": "0xAA3338Aa42CA68c43d9e5D9F1b21D06137660807",
    "userId": "958115750"
  }
}