{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbf89ebe4f558edc934c8892200a86ea99dcbf207f7000cbf0da000b2e6a020d6",
    "signature": "0x5cfbbe1999229ac1f9d787a2c2c1125afa7d8281cf37dee5b572c1f46ca84a8936f498b299264c972bf565b77d7f6f95c898175795f77203ada39409d95391dd1b",
    "signer": "0x81EFA534196e076193ecAA58E56299e2828d8589",
    "userId": "763716479"
  }
}