{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd1862b09521d4328fe938937708abced964fc3ba86a900de62eddc62ce809ef0",
    "signature": "0xda6a2a9b8c63e7b32f6fee580545de81391b56eaba93fbe0725ebba8c550a9e878a924b391df97928a8b234e45a3cd5eccc1b7da5acee457105e7851551a005b1c",
    "signer": "0x783cb29c1C701B6A4743B6b400fa12F6875E7cd6",
    "userId": "283193297"
  }
}