{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc7ffd154de967aa02c0c55b694fd8727d04297c79ca3455ccb6f59ab427df152",
    "signature": "0xba2d1a34a97b82e45240b2efaa7703f6e3e57d8fafbc61b7803d9c51ef997c0a1e6c882e943ef18d06b8b2eeadb537b779933837051e0e0184f6353d45531bd91c",
    "signer": "0x8EEFbF3d3dD9458d60fFa789616Bd714f100f9F2",
    "userId": "75683552"
  }
}