{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5fb66afc310dbb2fd719a5c2f7ee0df980e002aa58fb60461437b4660f3efe8e",
    "signature": "0x10bafe6f323dc6ee5f37d45a7c2a32f70facfdbb6b4c352bbfd2f792d118df774121b7204ae20899e4816298c6d7acc11ebcf2924751127a6c10e6b5dbf4c0aa1b",
    "signer": "0x2739eCab61Bd0fe15732eE7B3040F4F5a1b0f1EA",
    "userId": "503994528"
  }
}