What is the secure, self-hosted wallet to redeem BTG (Bitcoin Gold)?
Ideally self-hosted and open source.


State of the blockchain, crypto, whole ecosystem - early days - no ideal solutions - skilled developers are in extremely high demand and (to be honest) I didn't expect to find such tool.

With that said - first I moved actual BTC to another address.

Then - using the seed I was able to follow instructions here: https://coinsutra.com/claim-bitcoin-gold-btg/ (very good write up, THANKS)

In essence:


install Coinomi app (currently Android only)
restore wallet
put your phrase (don't tick BIP39)
add BTC (optionally, I first added BTC so that I could easily verify that balance is recognised)
add BTG - advanced - M/44H/0H/0H (important, defaults are not smart)
profit




I happened to keep BTC at blockchain.info (not anymore) so I had access to the 12 words seed - that was easy. There is a number of questions about claiming BTG from other type of the wallets - my first thought are leading towards bounty-smart-contract-fication - put some money in the pot and hire developers - so that whales can get their 5% dividend without risking much. 

In my case - I enjoy playing, educating, experimenting. It was time well spent - I believe so.