Inside Bitcoin

251
252Low-level changes
253=================
254
255Utilities
256---------
257
258- The `bitcoin-cli` utility used with the `-getinfo` parameter now
259  returns a `headers` field with the number of downloaded block headers
260  on the best headers chain (similar to the `blocks` field that is also
261  returned) and a `verificationprogress` field that estimates how much
262  of the best block chain has been synced by the local node.  The
263  information returned no longer includes the `protocolversion`,
264  `walletversion`, and `keypoololdest` fields.  (#17302, #17650)
265
266- The `bitcoin-cli` utility now accepts a `-stdinwalletpassphrase`
267  parameter that can be used when calling the `walletpassphrase` and
268  `walletpassphrasechange` RPCs to read the passphrase from standard
269  input without echoing it to the terminal, improving security against
270  anyone who can look at your screen.  The existing `-stdinrpcpass`
271  parameter is also updated to not echo the passphrase. (#13716)
272
273Command line
274------------
275
276- Command line options prefixed with main/test/regtest network names like
277  `-main.port=8333` `-test.server=1` previously were allowed but ignored. Now
278  they trigger "Invalid parameter" errors on startup. (#17482)
279
280New RPCs
281--------
282
283- The `dumptxoutset` RPC outputs a serialized snapshot of the current
284  UTXO set.  A script is provided in the `contrib/devtools` directory
285  for generating a snapshot of the UTXO set at a particular block
286  height.  (#16899)
287
288- The `generatetodescriptor` RPC allows testers using regtest mode to
289  generate blocks that pay an arbitrary output script descriptor.
290  (#16943)
291
292Updated RPCs
293------------
294
295- The `verifychain` RPC default values are now static instead of
296  depending on the command line options or configuration file
297  (`-checklevel`, and `-checkblocks`). Users can pass in the RPC
298  arguments explicitly when they don't want to rely on the default
299  values. (#18541)
300
301- The `getblockchaininfo` RPC's `verificationprogress` field will no
302  longer report values higher than 1.  Previously it would occasionally
303  report the chain was more than 100% verified.  (#17328)
304
305Tests
306-----
307
308- It is now an error to use an unqualified `walletdir=path` setting in
309  the config file if running on testnet or regtest networks. The setting
310  now needs to be qualified as `chain.walletdir=path` or placed in the
311  appropriate `[chain]` section. (#17447)
312
313- `-fallbackfee` was 0 (disabled) by default for the main chain, but
314  0.0002 by default for the test chains. Now it is 0 by default for all
315  chains. Testnet and regtest users will have to add
316  `fallbackfee=0.0002` to their configuration if they weren't setting it
317  and they want it to keep working like before. (#16524)
318
319Build system
320------------
321
322- Support is provided for building with the Android Native Development
323  Kit (NDK).  (#16110)
324
3250.20.0 change log
326=================
327
328### Mining
329- #18742 miner: Avoid stack-use-after-return in validationinterface (MarcoFalke)
330
331### Block and transaction handling
332- #15283 log: Fix UB with bench on genesis block (instagibbs)
333- #16507 feefilter: Compute the absolute fee rather than stored rate (instagibbs)
334- #16688 log: Add validation interface logging (jkczyz)
335- #16805 log: Add timing information to FlushStateToDisk() (jamesob)
336- #16902 O(1) `OP_IF/NOTIF/ELSE/ENDIF` script implementation (sipa)
337- #16945 introduce CChainState::GetCoinsCacheSizeState (jamesob)
338- #16974 Walk pindexBestHeader back to ChainActive().Tip() if it is invalid (TheBlueMatt)
339- #17004 Remove REJECT code from CValidationState (jnewbery)
340- #17080 Explain why `fCheckDuplicateInputs` can not be skipped and remove it (MarcoFalke)
341- #17328 GuessVerificationProgress: cap the ratio to 1 (darosior)
342- #17399 Templatize ValidationState instead of subclassing (jkczyz)
343- #17407 node: Add reference to mempool in NodeContext (MarcoFalke)
344- #17708 prevector: Avoid misaligned member accesses (ajtowns)
345- #17850,#17896,#17957,#18021,#18021,#18112 Serialization improvements (sipa)
346- #17925 Improve UpdateTransactionsFromBlock with Epochs (JeremyRubin)
347- #18002 Abstract out script execution out of `VerifyWitnessProgram()` (sipa)
348- #18388 Make VerifyWitnessProgram use a Span stack (sipa)
349- #18433 serialization: prevent int overflow for big Coin::nHeight (pierreN)
350- #18500 chainparams: Bump assumed valid hash (MarcoFalke)
351- #18551 Do not clear validationinterface entries being executed (sipa)
352
353### P2P protocol and network code
354- #15437 Remove BIP61 reject messages (MarcoFalke)
355- #16702 Supply and use asmap to improve IP bucketing in addrman (naumenkogs)
356- #16851 Continue relaying transactions after they expire from mapRelay (ajtowns)
357- #17164 Avoid allocating memory for addrKnown where we don't need it (naumenkogs)
358- #17243 tools: add PoissonNextSend method that returns mockable time (amitiuttarwar)
359- #17251 SocketHandler logs peer id for close and disconnect (Sjors)
360- #17573 Seed RNG with precision timestamps on receipt of net messages (TheBlueMatt)
361- #17624 Fix an uninitialized read in ProcessMessage(…, "tx", …) when receiving a transaction we already have (practicalswift)
362- #17754 Don't allow resolving of std::string with embedded NUL characters. Add tests (practicalswift)
363- #17758 Fix CNetAddr::IsRFC2544 comment + tests (tynes)
364- #17812 config, net, test: Asmap feature refinements and functional tests (jonatack)
365- #17951 Use rolling bloom filter of recent block txs for AlreadyHave() check (sdaftuar)
366- #17985 Remove forcerelay of rejected txs (MarcoFalke)
367- #18023 Fix some asmap issues (sipa)
368- #18054 Reference instead of copy in BlockConnected range loop (jonatack)
369- #18376 Fix use-after-free in tests (vasild)
370- #18454 Make addr relay mockable, add test (MarcoFalke)
371- #18458 Add missing `cs_vNodes` lock (MarcoFalke)
372- #18506 Hardcoded seeds update for 0.20 (laanwj)
373- #18808 Drop unknown types in getdata (jnewbery)
374- #18962 Only send a getheaders for one block in an INV (jnewbery)
375
376### Wallet
377- #13339 Replace %w by wallet name in -walletnotify script (promag)
378- #15931 Remove GetDepthInMainChain dependency on locked chain interface (ariard)
379- #16373 bumpfee: Return PSBT when wallet has privkeys disabled (instagibbs)
380- #16524 Disable -fallbackfee by default (jtimon)
381- #16766 Make IsTrusted scan parents recursively (JeremyRubin)
382- #16884 Change default address type to bech32 (instagibbs)
383- #16911 Only check the hash of transactions loaded from disk (achow101)
384- #16923 Handle duplicate fileid exception (promag)
385- #17056 descriptors: Introduce sortedmulti descriptor (achow101)
386- #17070 Avoid showing GUI popups on RPC errors (MarcoFalke)
387- #17138 Remove wallet access to some node arguments (jnewbery)
388- #17237 LearnRelatedScripts only if KeepDestination (promag)
389- #17260 Split some CWallet functions into new LegacyScriptPubKeyMan (achow101)
390- #17261 Make ScriptPubKeyMan an actual interface and the wallet to have multiple (achow101)
391- #17290 Enable BnB coin selection for preset inputs and subtract fee from outputs (achow101)
392- #17373 Various fixes and cleanup to keypool handling in LegacyScriptPubKeyMan and CWallet (achow101)
393- #17410 Rename `db` log category to `walletdb` (like `coindb`) (laanwj)
394- #17444 Avoid showing GUI popups on RPC errors (take 2) (MarcoFalke)
395- #17447 Make -walletdir network only (promag)
396- #17537 Cleanup and move opportunistic and superfluous TopUp()s (achow101)
397- #17553 Remove out of date comments for CalculateMaximumSignedTxSize (instagibbs)
398- #17568 Fix when sufficient preset inputs and subtractFeeFromOutputs (achow101)
399- #17677 Activate watchonly wallet behavior for LegacySPKM only (instagibbs)
400- #17719 Document better -keypool as a look-ahead safety mechanism (ariard)
401- #17843 Reset reused transactions cache (fjahr)
402- #17889 Improve CWallet:MarkDestinationsDirty (promag)
403- #18034 Get the OutputType for a descriptor (achow101)
404- #18067 Improve LegacyScriptPubKeyMan::CanProvide script recognition (ryanofsky)
405- #18115 Pass in transactions and messages for signing instead of exporting the private keys (achow101)
406- #18192,#18546 Bugfix: Wallet: Safely deal with change in the address book (luke-jr)
407- #18204 descriptors: Improve descriptor cache and cache xpubs (achow101)
408- #18274 rpc/wallet: Initialize nFeeRequired to avoid using garbage value on failure (kallewoof)
409- #18312 Remove deprecated fee bumping by totalFee (jonatack)
410- #18338 Fix wallet unload race condition (promag)
411
412### RPC and other APIs
413- #12763 Add RPC Whitelist Feature from #12248 (JeremyRubin)
414- #13716 cli: `-stdinwalletpassphrase` and non-echo stdin passwords (kallewoof)
415- #16689 Add missing fields to wallet rpc help output (ariard)
416- #16821 Fix bug where duplicate PSBT keys are accepted (erasmospunk)
417- #16899 UTXO snapshot creation (dumptxoutset)
418- #17156 psbt: Check that various indexes and amounts are within bounds (achow101)
419- #17264 Set default bip32derivs to true for psbt methods (Sjors)
420- #17283 improve getaddressinfo test coverage, help, code docs (jonatack)
421- #17302 cli: Add "headers" and "verificationprogress" to -getinfo (laanwj)
422- #17318 replace asserts in RPC code with `CHECK_NONFATAL` and add linter (adamjonas)
423- #17437 Expose block height of wallet transactions (promag)
424- #17519 Remove unused `COINBASE_FLAGS` (narula)
425- #17578 Simplify getaddressinfo labels, deprecate previous behavior (jonatack)
426- #17585 deprecate getaddressinfo label (jonatack)
427- #17746 Remove vector copy from listtransactions (promag)
428- #17809 Auto-format RPCResult (MarcoFalke)
429- #18032 Output a descriptor in createmultisig and addmultisigaddress (achow101)
430- #18122 Update validateaddress RPCExamples to bech32 (theStack)
431- #18208 Change RPCExamples to bech32 (yusufsahinhamza)
432- #18268 Remove redundant types from descriptions (docallag)
433- #18346 Document an RPCResult for all calls; Enforce at compile time (MarcoFalke)
434- #18396 Add missing HelpExampleRpc for getblockfilter (theStack)
435- #18398 Fix broken RPCExamples for waitforblock(height) (theStack)
436- #18444 Remove final comma for last entry of fixed-size arrays/objects in RPCResult (luke-jr)
437- #18459 Remove unused getbalances() code (jonatack)
438- #18484 Correctly compute redeemScript from witnessScript for signrawtransaction (achow101)
439- #18487 Fix rpcRunLater race in walletpassphrase (promag)
440- #18499 Make rpc documentation not depend on call-time rpc args (MarcoFalke)
441- #18532 Avoid initialization-order-fiasco on static CRPCCommand tables (MarcoFalke)
442- #18541 Make verifychain default values static, not depend on global args (MarcoFalke)
443- #18809 Do not advertise dumptxoutset as a way to flush the chainstate (MarcoFalke)
444- #18814 Relock wallet only if most recent callback (promag)
445
446### GUI
447- #15023 Restore RPC Console to non-wallet tray icon menu (luke-jr)
448- #15084 Don't disable the sync overlay when wallet is disabled (benthecarman)
449- #15098 Show addresses for "SendToSelf" transactions (hebasto)
450- #15756 Add shortcuts for tab tools (promag)
451- #16944 create PSBT with watch-only wallet (Sjors)
452- #16964 Change sendcoins dialogue Yes to Send (instagibbs)
453- #17068 Always generate `bitcoinstrings.cpp` on `make translate` (D4nte)
454- #17096 Rename debug window (Zero-1729)
455- #17105 Make RPCConsole::TabTypes an enum class (promag)
456- #17125 Add toolTip and placeholderText to sign message fields (dannmat)
457- #17165 Remove BIP70 support (fanquake)
458- #17180 Improved tooltip for send amount field (JeremyCrookshank)
459- #17186 Add placeholder text to the sign message field (Danny-Scott)
460- #17195 Send amount placeholder value (JeremyCrookshank)
461- #17226 Fix payAmount tooltip in SendCoinsEntry (promag)
462- #17360 Cleaning up hide button tool tip (Danny-Scott)
463- #17446 Changed tooltip for 'Label' & 'Message' text fields to be more clear (dannmat)
464- #17453 Fix intro dialog labels when the prune button is toggled (hebasto)
465- #17474 Bugfix: GUI: Recognise `NETWORK_LIMITED` in formatServicesStr (luke-jr)
466- #17492 Bump fee returns PSBT on clipboard for watchonly-only wallets (instagibbs)
467- #17567 Remove macOS start on login code (fanquake)
468- #17587 Show watch-only balance in send screen (Sjors)
469- #17694 Disable 3rd-party tx-urls when wallet disabled (brakmic)
470- #17696 Force set nPruneSize in QSettings after the intro dialog (hebasto)
471- #17702 Move static placeholder texts to forms (laanwj)
472- #17826 Log Qt related info (hebasto)
473- #17886 Restore English translation option (achow101)
474- #17906 Set CConnman byte counters earlier to avoid uninitialized reads (ryanofsky)
475- #17935 Hide HD & encryption icons when no wallet loaded (brakmic)
476- #17998 Shortcut to close ModalOverlay (emilengler)
477- #18007 Bugfix: GUI: Hide the HD/encrypt icons earlier so they get re-shown if another wallet is open (luke-jr)
478- #18060 Drop PeerTableModel dependency to ClientModel (promag)
479- #18062 Fix unintialized WalletView::progressDialog (promag)
480- #18091 Pass clientmodel changes from walletframe to walletviews (jonasschnelli)
481- #18101 Fix deprecated QCharRef usage (hebasto)
482- #18121 Throttle GUI update pace when -reindex (hebasto)
483- #18123 Fix race in WalletModel::pollBalanceChanged (ryanofsky)
484- #18160 Avoid Wallet::GetBalance in WalletModel::pollBalanceChanged (promag)
485- #18360 Bump transifex slug and update English translations for 0.20 (laanwj)
486- #18402 Display mapped AS in peers info window (jonatack)
487- #18492 Translations update pre-branch (laanwj)
488- #18549 Fix Window -> Minimize menu item (hebasto)
489- #18578 Fix leak in CoinControlDialog::updateView (promag)
490- #18894 Fix manual coin control with multiple wallets loaded (promag)
491
492### Build system
493- #16667 Remove mingw linker workaround from win gitian descriptor (fanquake)
494- #16669 Use new fork of osslsigncode for windows gitian signing (fanquake)
495- #16949 Only pass --disable-dependency-tracking to packages that understand it (fanquake)
496- #17008 Bump libevent to 2.1.11 in depends (stefanwouldgo)
497- #17029 gitian: Various improvements for windows descriptor (dongcarl)
498- #17033 Disable _FORTIFY_SOURCE when enable-debug (achow101)
499- #17057 Switch to upstream libdmg-hfsplus (fanquake)
500- #17066 Remove workaround for ancient libtool (hebasto)