This is a set of scripts that can be used to transfer a number of GRINs from one main wallet to a configurable number of smaller wallets.
These scripts use tcl and expect, so install it with apt install expect. They expect grin-wallet to be in the PATH.
Edit the script and set numwallets and walletprefix to your liking. Running the script generates several folders in the current directory, one for each wallet generated. It outputs the names of the wallets created (e.g. my_1, my_2, etc.) together with their 24-word seed phrase.
Caution: the created wallets are _not password protected. You should destroy them immediately after calling the third script (receive_txs) and keep the seed phrases in a secure place.
Your main wallet (containing the funds to split/send to the previously generated wallets) needs to be in the same directory as the generated wallets and this script. Set senderwallet and senderpassword accordingly. amount is the amount to send to each wallet in GRIN (i.e. not multiplied by 1e9) and numwallets and walletprefix should match your previous settings.
This script first sends 0.1 GRIN to itself and creates numwallets + 1 change outputs. This means that after waiting ~10 minutes so the tx-to-self got confirmed, the remaining numwallets transaction can all happen at once.
After running this script you'll have a .tx file for each wallet (e.g. my_1.tx, my_2.tx, etc.)
This scripts looks for all .tx files in the current directory, and if it finds a matching wallet imports (receive in grin terminology) it. The output is a .tx.response file for each transaction.
Set senderwallet and senderpassword like in step 2. This script looks for all .tx.response files in the current directory and finalizes the transactions from the main wallet.
When you sell coins in Germany, you don't pay any taxes on the sale (and profit) if you've held the coins for at least a year. Given that transactions in grin are private and just the utxo set is stored, this might be hard to prove. With this script, you can create several "GRIN stashes", then wait a year, and have a single utxo from a year ago if you recover the wallet via its seed.
There are probably other use cases as well, e.g. gifting a bunch GRIN, or creating physical GRIN-coins :-)
expect is a great tool for scripting interactive command line tools (go check it out); also I've fallen in love with tcl while using EDA tools like Cadence.
It's .sh to indicate it should be run from a terminal... I know ¯\_(ツ)_/¯