Hello,

wanted to play with cashu by setting up a local mint, and mint some tokens. Getting error binascii.Error: Incorrect padding (local mint) when running cashu receive

Steps taken

Install cashu via poetry (per readme)
Create .env file with DEBUG=TRUE, TOR=FALSE, LIGHTNING=FALSE, comment out SOCKS
```
echo "DEBUG=TRUE
```

CASHU_DIR=~/.cashu

WALLET

MINT_URL=https://localhost:3338

MINT_HOST=127.0.0.1 MINT_PORT=3338

use builtin tor, this overrides SOCKS_HOST and SOCKS_PORT

TOR=FALSE

use custom tor proxy, use with TOR=false

SOCKS_HOST=localhost

SOCKS_PORT=9050

MINT

MINT_PRIVATE_KEY=supersecretprivatekey

MINT_SERVER_HOST=127.0.0.1 MINT_SERVER_PORT=3338

LIGHTNING=FALSE

fee to reserve in percent of the amount

LIGHTNING_FEE_PERCENT=1.0

minimum fee to reserve

LIGHTNING_RESERVE_FEE_MIN=4000

LNBITS_ENDPOINT=https://legend.lnbits.com LNBITS_KEY=yourkeyasdasdasd

NOSTR

nostr private key to which to receive tokens to

NOSTR_PRIVATE_KEY=hex_nostrprivatekey_here

nostr relays (comma separated list)

NOSTR_RELAYS=\"wss://nostr-pub.wellorder.net\" " > .env

3. Start mint: `poetry run mint`

5. In new tab:  `cashu receive 100`

23-01-25 11:36:36.044 | DEBUG | cashu.wallet.wallet:init:407 - Wallet initalized with mint URL http://127.0.0.1:3338 Balance: 0 sat 2023-01-25 11:36:36.061 | DEBUG | cashu.wallet.wallet:_load_mint:156 - Mint keysets: ['eNPchHkKANBq'] 2023-01-25 11:36:36.062 | DEBUG | cashu.wallet.wallet:_load_mint:157 - Current mint keyset: eNPchHkKANBq Traceback (most recent call last): File "/home//.pyenv/versions/3.9.13/envs/cashu/bin/cashu", line 6, in sys.exit(cli()) File "/home//.pyenv/versions/3.9.13/envs/cashu/lib/python3.9/site-packages/click/core.py", line 1128, in call return self.main(args, kwargs) File "/home//.pyenv/versions/3.9.13/envs/cashu/lib/python3.9/site-packages/click/core.py", line 1053, in main rv = self.invoke(ctx) File "/home//.pyenv/versions/3.9.13/envs/cashu/lib/python3.9/site-packages/click/core.py", line 1659, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/home//.pyenv/versions/3.9.13/envs/cashu/lib/python3.9/site-packages/click/core.py", line 1395, in invoke return ctx.invoke(self.callback, ctx.params) File "/home//.pyenv/versions/3.9.13/envs/cashu/lib/python3.9/site-packages/click/core.py", line 754, in invoke return __callback(args, kwargs) File "/home//.pyenv/versions/3.9.13/envs/cashu/lib/python3.9/site-packages/click/decorators.py", line 26, in new_func return f(get_current_context(), *args, *kwargs) File "/home//code/cashu/cashu/wallet/cli.py", line 116, in wrapper return asyncio.run(f(args, kwargs)) File "/home//.pyenv/versions/3.9.13/lib/python3.9/asyncio/runners.py", line 44, in run return loop.run_until_complete(main) File "/home//.pyenv/versions/3.9.13/lib/python3.9/asyncio/base_events.py", line 647, in run_until_complete return future.result() File "/home//code/cashu/cashu/wallet/cli.py", line 412, in receive_cli await receive(ctx, token, lock) File "/home//code/cashu/cashu/wallet/cli.py", line 357, in receive dtoken = json.loads(base64.urlsafe_b64decode(token)) File "/home//.pyenv/versions/3.9.13/lib/python3.9/base64.py", line 133, in urlsafe_b64decode return b64decode(s) File "/home//.pyenv/versions/3.9.13/lib/python3.9/base64.py", line 87, in b64decode return binascii.a2b_base64(s) binascii.Error: Incorrect padding



### Some general Cashu questions
- How do I actually mint new token in my local mint?
- Is there a documentation about each options in the `.env` file?
    - For instance, what's the differnce between `MINT_HOST` and `MINT_SERVER_HOST` ?
    - How would I connect the CLI to Calle's Mint on Legend LNbits (mint_id=GsAL2UKczDnkS5SWW65GZE) ?
    - can I import tokens from a backup json?

Hello, thank you for this report!

To your issue

You have used the command cashu receive <token> wrong, there should be a token not an amount there.

Instead, to mint yourself free ecash, you can use cashu invoice 1000 and you will get free money since you've set LIGHTNING=false. This is just for testing and development!

To your questions:

.env variavbles

There are only sporadic comments in the .env.example. MINT_HOST is the host the wallet will connect to. MINT_SERVER_HOST is the host the mint will listen on. Very bad naming, I should add some comments :)

Use a different mint

The mint URL for the lnbits mints is https://legend.lnbits.com/cashu/api/v1/GsAL2UKczDnkS5SWW65GZE (replace ID with mint_id). This is not quite easy to figure out, it's on my todo list.

There are multiple options to use this mint in the CLI:

You can send yourself a token from the LNbits JavaScript client to the Python CLI. The CLI will then ask you for about the mint this token is from. Then you enter that URL above.
You can mint tokens directly from the CLI by setting the environment variable for a single command: MINT_URL=https://legend.lnbits.com/cashu/api/v1/GsAL2UKczDnkS5SWW65GZE cashu invoice 100
You can set the mint as the default mint by changing the MINT_URL in the .env file

Thank you for your interest, let me know if anything is unclear and please join our Telegram group: https://t.me/CashuBTC

cashubtc / nutshell

binascii.Error: Incorrect padding (local mint) #101