{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2d4d9efe8491edb6ed2010bf90c72beb07159821966a6fccbceca227e799c684",
    "signature": "0xe86dcd7d2ede4d8da27637dbd90ce22abe62ba2ecfb0c54ff90f138aedbca76d23ab60c3c2bc7f550ff2a9fbd41209c9d9c75fae083c438c330a81784ea0bf031c",
    "signer": "0x8E3A4E1A0d1Aa7628E0FDbc872062F921A449403",
    "userId": "552753858"
  }
}