{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa88c25dbbb9015ccb56c7cf68a95acc83f8701688dd392c36a39fec521a78817",
    "signature": "0x3e5df219e84faad7f70d09f4ee81959e42bc5f70893d80830672f411a6c543ae5b8df0e9064be03d503a6b205252108ed59ef6b1b2812ba697ee2e9d1e109f251c",
    "signer": "0xE36F4D81407594D330051f9eC8FDE83c6B8364f7",
    "userId": "842650858"
  }
}