[Upstream] [Wallet] Various transaction handling improvements (Part 1) #331
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Backport of bitcoin/bitcoin#6550 Assume that when a wallet transaction has a valid block hash and transaction position in it, the transaction is actually there. We're already trusting wallet data in a much more fundamental way anyway. To prevent backward compatibility issues, a new record is used for storing the block locator in the wallet. Old wallets will see a wallet file synchronized up to the genesis block, and rescan automatically.
Backport of bitcoin/bitcoin#6508 This switches the Merkle tree logic for blocks to one that runs in constant (small) space. The old code is moved to tests, and a new test is added that for various combinations of block sizes, transaction positions to compute a branch for, and mutations: * Verifies that the old code and new code agree for the Merkle root. * Verifies that the old code and new code agree for the Merkle branch. * Verifies that the computed Merkle branch is valid. * Verifies that mutations don't change the Merkle root. * Verifies that mutations are correctly detected.
During startup, when adding pending wallet transactions, which spend outputs of other pending wallet transactions, back to the memory pool, and when they are added out of order, it appears as if they are orphans with missing inputs. Those transactions are then rejected and flagged as conflicting" (= not in the memory pool, not in the block chain). To prevent this, transactions are explicitly sorted.
UserR256
approved these changes
Jan 11, 2023
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from PIVX-Project/PIVX#970
Will be split into 2 parts
This part adds the initial commits + 1 other that can be safely de-coupled
Part 2 will add the MarkConflicted/AbandonTransaction-related commits/functions/fixes