{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5558c139a8eb9e1304830eb884cc44d23f7d1d179cd0ad148ba05370c56abccc",
    "signature": "0xa6e43455384945fecfa0d6e2969d4f3c70d2f81a67b6475f842b958d2800864545cd14af6fcf6df9c66fd6265775dc793d41820ce014cb0cbe94a1e31f4de5781b",
    "signer": "0xffd396569aa3797430B5C2DC87aD41Ca3aDE6eD7",
    "userId": "103648504"
  }
}