electrs: UTXO included in unconfirmed transaction inputs are returned in the unspent

[ahonn]

How to reproduce

• btc_address has 2 UTXOs: UTXO#A and UTXO#B
• sent a transaction that uses UTXO#A as input.
• Before tx is confirmed, /bitcoin/v1/address/{address}/unspent will still return UTXO#A.

Actual

Return UTXO#A and UTXO#B before tx is confirmed.

Expected

Return UTXO#B only before tx is confirmed.

Note

We can use the API provided by blockstream/electrs for comparison.
eg. https://blockstream.info/testnet/api/address/tb1qm4eyx777203zmajlawz958wn27z08envm2jelm/utxo

I reckon this might be due to differences in the config between our deployed electrs and the one deployed by blockstream. We need to dig deeper to confirm.

[Flouse]

I reckon this might be due to differences in the config between our deployed electrs and the one deployed by blockstream. We need to dig deeper to confirm.

Maybe the reason is the different pending transaction set in different electrs + btc-node.

• feat(bitcoin): post btc transaction to multi electrs/btc nodes #127 might solve this issue.