{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf41960fafd63b7f11c7531f18b23f5d9d9dfe2b7bd84c0f26a14387eb0808750",
    "signature": "0xa8651e754ca1247e9f95a489470c870f92834b7c395065712d031a8ba4fa9a9b36d0b6d40e5f2506e1e8b265e9d4b481b51e1655a718ab95eebaa2c62149a9e61b",
    "signer": "0x5dd44D2a666f80E78cE8f0969F625DbE63939cbF",
    "userId": "988378847"
  }
}