{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7b2b0534f402d380498b9c085b316651acb667b86ca09e8c7de0571013ca80c3",
    "signature": "0xd7a0cc2e3c3d956c761599ea2dc1ccf94a076c8948041e4ab3a4fff501b1a0bc5f88f4b7f6db165109e58c4b793f437f431975b23e03d15bf137801d0c8c8d471b",
    "signer": "0xCD3D5831A563347C1cd639b09f0c5C5c679Af2D5",
    "userId": "830665049"
  }
}