Coinbase outputs require COINBASE_MATURITY + 1 = 121 confirmations before
they can be spent. The consensus rule (palladiumcore tx_verify.cpp) is
nSpendHeight - nHeight >= 120; the +1 adds one block of safety margin,
matching the Qt wallet (wallet.cpp: COINBASE_MATURITY+1). Regular UTXOs
require MinConfirmations (6 on mainnet, 1 on testnet/regtest — wallet
policy, no consensus rule).
Changes:
- ChainProfile: add CoinbaseMaturity and MinConfirmations fields
- ChainProfiles: mainnet CoinbaseMaturity=120 / MinConfirmations=6;
testnet/regtest inherit 120, override MinConfirmations=1
- PalladiumNetworks: align NBitcoin Consensus.CoinbaseMaturity to 120
- CachedUtxo: add IsCoinbase flag (ElectrumX listunspent does not expose
this; derived from Transaction.IsCoinBase on the raw tx)
- WalletSynchronizer: set IsCoinbase during local UTXO reconstruction
- TransactionFactory.Build: add tipHeight param; filter by threshold;
error reports reason (immature coinbase with X/121 counter, under-
confirmed regulars with best-seen count, mempool amounts)
- All Build() call sites updated (App, Donate, CLI)
- Two new tests: coinbase maturity boundary (119→220 tip) and mainnet
min-conf boundary (5→6 confirmations)
Help button now shows a two-tab overlay:
- Info: existing about/version content
- Donate: donate flow to the dev address (plm1qdq3…) with free amount
input, prepare preview, and confirm-and-broadcast button
New MainWindowViewModel.Donate.cs partial: DonateAmount / DonatePreview
/ HasPendingDonate observable properties, PrepareDonateCommand (builds
the tx with hardcoded dev address via the existing TransactionFactory),
ConfirmDonateCommand (broadcasts and syncs). Donate state is reset on
overlay close. Six-language Loc keys added (help.tab.info/donate,
donate.desc/dev.address/amount/prepare/confirm).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
davide