{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6a499a7e389281a224d1a00bfc174b453cda259681d828ec967b580d626b4ced",
    "signature": "0x442e072dd4420f40c424a4186554e04d083c1809ddb3bd551173944250bc3def7b0a82720173ae834f598228ec6805e2d11c9d6827f88edeea04ac2533b632bc1c",
    "signer": "0x672e9a41a6b972AB2eD6BEB1D4a6e4F09dA4C9F5",
    "userId": "302680854"
  }
}