{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x543ea6d01a743806186f698e0424e16c0042c7bbdd903e9434f635c0dbf32b0d",
    "signature": "0x2b91cd29d3e4a11cd4ff3ed633fa13affd8d83e1000e2f0e9222aedfb45cf8b71b99b0016b6b31851ba830d5d2f61e9d565955a77573f3f555f43ab25176c0c81c",
    "signer": "0xaCFF91F76Af49969648dC2d98cC094EBA9B33d70",
    "userId": "380735807"
  }
}