Blockfrost is not reliable

[python-cardano]

Blockfrost is not reliable

[34r7h]

Notice the first image has a native asset with quantity of only 1 , whereas the second image is a ss from cardano showing 2.

It's worth noting that my front-end is also pulling from blockfrost (via nodejs) and showing the correct amount..

[Et9797]

What seems to be the issue here? As far as I can tell there's two UTxOs, each have the Xymbol token with a quantity of 1. So a total of 2 for the address, as shown on Cardanoscan. What I think you're doing on the front-end is querying Blockfrost's asset addresses endpoint assets/{asset}/addresses, however in Pycardano you're querying utxos, so you'll need to sum them up

[mmahut]

@34r7h please read a little bit about how the UTXO model works. The data reported are correct.

[34r7h]

@Et9797 you're right, my mistake. Been a long struggle to get systems working and twice before BF data wasn't updating so I jumped to an incorrect conclusion. Thanks for helping me see.

[34r7h]

@Et9797 i get two utxos from the same tx id when the utxo is a minting tx. difficult to build a change function. can you recommend a good way to handle this scenario:

─────────────────────────
utxos_from_bf: <class 'list'>
───────────────

0: {'input': {'index': 0,
 'transaction_id': TransactionId(hex='12a3c696904332e678dc4897b343e111dd688caa9e567e24255aa3a8bd84c754')},
 'output': {'address': addr1q9nzv2662ey4kkx96makz82q99wwzehs2uzrt9wwyttq723xkkkcpe0xgfzya3g0jzz825fyfzwm7melppsjr3uw72qs7am8ys,
 'amount': {'coin': 1379280,
 'multi_asset': {ScriptHash(hex='ef86d15fdc26f796f22582bdafa4369d13e8cd47ef0480b6f57dc899'): {AssetName(b'Panjtara Token'): 1}}},
 'datum_hash': None}} 

1: {'input': {'index': 1,
 'transaction_id': TransactionId(hex='12a3c696904332e678dc4897b343e111dd688caa9e567e24255aa3a8bd84c754')},
 'output': {'address': addr1q9nzv2662ey4kkx96makz82q99wwzehs2uzrt9wwyttq723xkkkcpe0xgfzya3g0jzz825fyfzwm7melppsjr3uw72qs7am8ys,
 'amount': {'coin': 2428467, 'multi_asset': {}},
 'datum_hash': None}} 

[Et9797]

@Et9797 i get two utxos from the same tx id when the utxo is a minting tx. difficult to build a change function. can you recommend a good way to handle this scenario:

─────────────────────────
utxos_from_bf: <class 'list'>
───────────────

0: {'input': {'index': 0,
 'transaction_id': TransactionId(hex='12a3c696904332e678dc4897b343e111dd688caa9e567e24255aa3a8bd84c754')},
 'output': {'address': addr1q9nzv2662ey4kkx96makz82q99wwzehs2uzrt9wwyttq723xkkkcpe0xgfzya3g0jzz825fyfzwm7melppsjr3uw72qs7am8ys,
 'amount': {'coin': 1379280,
 'multi_asset': {ScriptHash(hex='ef86d15fdc26f796f22582bdafa4369d13e8cd47ef0480b6f57dc899'): {AssetName(b'Panjtara Token'): 1}}},
 'datum_hash': None}} 

1: {'input': {'index': 1,
 'transaction_id': TransactionId(hex='12a3c696904332e678dc4897b343e111dd688caa9e567e24255aa3a8bd84c754')},
 'output': {'address': addr1q9nzv2662ey4kkx96makz82q99wwzehs2uzrt9wwyttq723xkkkcpe0xgfzya3g0jzz825fyfzwm7melppsjr3uw72qs7am8ys,
 'amount': {'coin': 2428467, 'multi_asset': {}},
 'datum_hash': None}} 

Not exactly sure what you're after. If you're just trying to get the balance of an address you can simply use the api function from Pycardano's Blockfrost chain context like so:

from pycardano import *

NETWORK = Network.TESTNET
chain_context = BlockFrostChainContext(
    project_id="API_KEY_HERE",
    network=NETWORK
)

nami_address = Address.from_primitive("YOUR_ADDR")

balance = chain_context.api.address(str(nami_address))
print(balance)

Now parse the tokens/ADA from the returned Namespace object. Note: the ADA amount is including collateral + Ada locked with assets. So don't be confused if Nami shows a slightly lower amount than that (provided you're using Nami).

[34r7h]

Cheers, @Et9797

I'm not using Nami, I'm building a wallet interface in my project. Lot's of things work until edge cases come up, such as the token retainers and returns not meeting minimum requirements. It's difficult to reason about this considering there's not much of a difference between a minting transaction and another utxo when balancing inputs and outputs.

Is there a way besides checking via blockfrost.BlockFrostApi.asset(asset_policy) if a utxo is a minting utxo containing unspendable ada? I think really this is a problem cardano should address at it's core else I would think many developers will be addressing the same issue continuously.