Checking if a coin is a CAT or not

[ageorge95]

Hi,
I tried to check if a given coin ph is a CAT or not, but I am getting an error.
I have used the latest commit at the time of writing: 3b16013

Here is the code snippet I used:

from chia.wallet.cat_wallet.cat_utils import match_cat_puzzle
from chia.types.blockchain_format.program import Program

ph_as_hex = '76157cf4ba23c8533380f2b7ef44179dad132be74a2363d967c3a13910f648d6'
my_program = Program.fromhex(ph_as_hex)
is_ph = match_cat_puzzle(puzzle=my_program)
print(is_ph)

And I am getting this error:

Traceback (most recent call last):
  File "C:\propriu\git_repos\chia-blockchain_u_m\TEST.py", line 5, in <module>
    my_program = Program.fromhex(ph_as_hex)
  File "C:\propriu\git_repos\chia-blockchain_u_m\chia\types\blockchain_format\program.py", line 61, in fromhex
    return cls.from_bytes(hexstr_to_bytes(hexstr))
  File "C:\propriu\git_repos\chia-blockchain_u_m\chia\types\blockchain_format\program.py", line 56, in from_bytes
    assert f.read() == b""
AssertionError

For sure I am doing something wrong in my code, can you guys drop me a hint ?

Thanks 🙂

[ageorge95]

Update: Now I know that the puzzle hash I used in the original code snippet is wrong, the puzzle needs to be used.
To get the puzzle I used the get_puzzle_and_solution full node RPC.

-> match_cat_puzzle() works for me now
-> I can see if a coin is a CAT and its token ID

But I cannot figure out the coin denominator: how many mojos per CAT.

As before, any hint is welcomed.

[ageorge95]

Update: Finally I figured out how to read the CATs of a given address/ mnemonic. The logic was implemented here if anyone is interested: https://github.com/ageorge95/WILLOW-chia-forks-instant-wallet-balance/releases/tag/v1.3

I'll mark this answer as the "solution", to have closure on this discussion.