{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8b90b53e1f3e9453c5aab51d33797a878b674e9373f89461387dc9847649b970",
    "signature": "0xadfddaed2e248645ca6b6815b3474caad78795572febd74004483e4cebcfe7de667706c55959dcef482c3db50cca04f959cea8492de1e7854999b4e8156230661c",
    "signer": "0x6A2105c886554E76044CC1b23065cE8F193A0E42",
    "userId": "569588208"
  }
}