Quote from: achow101 on January 14, 2021, 04:43:25 PM

0.21.0 Release Notes

Bitcoin Core version 0.21.0 is now available from:

https://bitcoincore.org/bin/bitcoin-core-0.21.0/

Or through BitTorrent:

%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969%2Fannounce&tr=udp%3A%2F%2Fexplodie.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969]magnet:?xt=urn:btih:665c5bdc6f49948e47c1098d91ace98bd216150e&dn=bitcoin-core-0.21.0&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.[Suspicious link removed]%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969%2Fannounce&tr=udp%3A%2F%2Fexplodie.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969

This release includes new features, various bug fixes and performance
improvements, as well as updated translations.

Please report bugs using the issue tracker at GitHub:

https://github.com/bitcoin/bitcoin/issues

To receive security and update notifications, please subscribe to:

https://bitcoincore.org/en/list/announcements/join/

How to Upgrade

If you are running an older version, shut it down. Wait until it has completely
shut down (which might take a few minutes in some cases), then run the
installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac)
or bitcoind/bitcoin-qt (on Linux).

Upgrading directly from a version of Bitcoin Core that has reached its EOL is
possible, but it might take some time if the data directory needs to be migrated. Old
wallet versions of Bitcoin Core are generally supported.

Compatibility

Bitcoin Core is supported and extensively tested on operating systems
using the Linux kernel, macOS 10.12+, and Windows 7 and newer. Bitcoin
Core should also work on most other Unix-like systems but is not as
frequently tested on them. It is not recommended to use Bitcoin Core on
unsupported systems.

From Bitcoin Core 0.20.0 onwards, macOS versions earlier than 10.12 are no
longer supported. Additionally, Bitcoin Core does not yet change appearance
when macOS "dark mode" is activated.

The node's known peers are persisted to disk in a file called peers.dat. The
format of this file has been changed in a backwards-incompatible way in order to
accommodate the storage of Tor v3 and other BIP155 addresses. This means that if
the file is modified by 0.21.0 or newer then older versions will not be able to
read it. Those old versions, in the event of a downgrade, will log an error
message "Incorrect keysize in addrman deserialization" and will continue normal
operation as if the file was missing, creating a new empty one. (#19954, #20284)

Notable changes

P2P and network changes

The mempool now tracks whether transactions submitted via the wallet or RPCs
have been successfully broadcast. Every 10-15 minutes, the node will try to
announce unbroadcast transactions until a peer requests it via a getdata
message or the transaction is removed from the mempool for other reasons.
The node will not track the broadcast status of transactions submitted to the
node using P2P relay. This version reduces the initial broadcast guarantees
for wallet transactions submitted via P2P to a node running the wallet. (#18038)
The size of the set of transactions that peers have announced and we consider
for requests has been reduced from 100000 to 5000 (per peer), and further
announcements will be ignored when that limit is reached. If you need to dump
(very) large batches of transactions, exceptions can be made for trusted
peers using the "relay" network permission. For localhost for example it can
be enabled using the command line option -whitelist=relay@127.0.0.1.
(#19988)
This release adds support for Tor version 3 hidden services, and rumoring them
over the network to other peers using
BIP155.
Version 2 hidden services are still fully supported by Bitcoin Core, but the
Tor network will start
deprecating them in the
coming months. (#19954)
The Tor onion service that is automatically created by setting the
-listenonion configuration parameter will now be created as a Tor v3 service
instead of Tor v2. The private key that was used for Tor v2 (if any) will be
left untouched in the onion_private_key file in the data directory (see
-datadir) and can be removed if not needed. Bitcoin Core will no longer
attempt to read it. The private key for the Tor v3 service will be saved in a
file named onion_v3_private_key. To use the deprecated Tor v2 service (not
recommended), the onion_private_key can be copied over
onion_v3_private_key, e.g.
cp -f onion_private_key onion_v3_private_key. (#19954)
The client writes a file (anchors.dat) at shutdown with the network addresses
of the node’s two outbound block-relay-only peers (so called "anchors"). The
next time the node starts, it reads this file and attempts to reconnect to those
same two peers. This prevents an attacker from using node restarts to trigger a
complete change in peers, which would be something they could use as part of an
eclipse attack. (#17428)
This release adds support for serving
BIP157 compact
filters to peers on the network when enabled using
-blockfilterindex=1 -peercfilters=1. (#16442)
This release adds support for signets
(BIP325) in
addition to the existing mainnet, testnet, and regtest networks. Signets are
centrally-controlled test networks, allowing them to be more predictable
test environments than the older testnet. One public signet is maintained, and
selectable using -signet. It is also possible to create personal signets.
(#18267).
This release implements
BIP339
wtxid relay. When negotiated, transactions are announced using their wtxid
instead of their txid. (#18044).
This release implements the proposed Taproot consensus rules
(BIP341 and
BIP342),
without activation on mainnet. Experimentation with Taproot can be done on
signet, where its rules are already active. (#19553)

Updated RPCs

The getpeerinfo RPC has a new network field that provides the type of
network ("ipv4", "ipv6", or "onion") that the peer connected through. (#20002)
The getpeerinfo RPC now has additional last_block and last_transaction
fields that return the UNIX epoch time of the last block and the last <em>valid</em>
transaction received from each peer. (#19731)
getnetworkinfo now returns two new fields, connections_in and
connections_out, that provide the number of inbound and outbound peer
connections. These new fields are in addition to the existing connections
field, which returns the total number of peer connections. (#19405)
Exposed transaction version numbers are now treated as unsigned 32-bit
integers instead of signed 32-bit integers. This matches their treatment in
consensus logic. Versions greater than 2 continue to be non-standard
(matching previous behavior of smaller than 1 or greater than 2 being
non-standard). Note that this includes the joinpsbt command, which combines
partially-signed transactions by selecting the highest version number.
(#16525)
getmempoolinfo now returns an additional unbroadcastcount field. The
mempool tracks locally submitted transactions until their initial broadcast
is acknowledged by a peer. This field returns the count of transactions
waiting for acknowledgement.
Mempool RPCs such as getmempoolentry and getrawmempool with
verbose=true now return an additional unbroadcast field. This indicates
whether initial broadcast of the transaction has been acknowledged by a
peer. getmempoolancestors and getmempooldescendants are also updated.
The getpeerinfo RPC no longer returns the banscore field unless the configuration
option -deprecatedrpc=banscore is used. The banscore field will be fully
removed in the next major release. (#19469)
The testmempoolaccept RPC returns vsize and a fees object with the base fee
if the transaction would pass validation. (#19940)
The getpeerinfo RPC now returns a connection_type field. This indicates
the type of connection established with the peer. It will return one of six
options. For more information, see the getpeerinfo help documentation.
(#19725)
The getpeerinfo RPC no longer returns the addnode field by default. This
field will be fully removed in the next major release. It can be accessed
with the configuration option -deprecatedrpc=getpeerinfo_addnode. However,
it is recommended to instead use the connection_type field (it will return
manual when addnode is true). (#19725)
The getpeerinfo RPC no longer returns the whitelisted field by default.
This field will be fully removed in the next major release. It can be accessed
with the configuration option -deprecatedrpc=getpeerinfo_whitelisted. However,
it is recommended to instead use the permissions field to understand if specific
privileges have been granted to the peer. (#19770)
The walletcreatefundedpsbt RPC call will now fail with
Insufficient funds when inputs are manually selected but are not enough to cover
the outputs and fee. Additional inputs can automatically be added through the
new add_inputs option. (#16377)
The fundrawtransaction RPC now supports add_inputs option that when false
prevents adding more inputs if necessary and consequently the RPC fails.

Changes to Wallet or GUI related RPCs can be found in the GUI or Wallet section below.

New RPCs

The getindexinfo RPC returns the actively running indices of the node,
including their current sync status and height. It also accepts an index_name
to specify returning the status of that index only. (#19550)

Build System

Updated settings

The same ZeroMQ notification (e.g. -zmqpubhashtx=address) can now be
specified multiple times to publish the same notification to different ZeroMQ
sockets. (#18309)
The -banscore configuration option, which modified the default threshold for
disconnecting and discouraging misbehaving peers, has been removed as part of
changes in 0.20.1 and in this release to the handling of misbehaving peers.
Refer to "Changes regarding misbehaving peers" in the 0.20.1 release notes for
details. (#19464)
The -debug=db logging category, which was deprecated in 0.20 and replaced by
-debug=walletdb to distinguish it from coindb, has been removed. (#19202)
A download permission has been extracted from the noban permission. For
compatibility, noban implies the download permission, but this may change
in future releases. Refer to the help of the affected settings -whitebind
and -whitelist for more details. (#19191)
Netmasks that contain 1-bits after 0-bits (the 1-bits are not contiguous on
the left side, e.g. 255.0.255.255) are no longer accepted. They are invalid
according to RFC 4632. Netmasks are used in the -rpcallowip and -whitelist
configuration options and in the setban RPC. (#19628)
The -blocksonly setting now completely disables fee estimation. (#18766)

Changes to Wallet or GUI related settings can be found in the GUI or Wallet section below.

Tools and Utilities

A new bitcoin-cli -netinfo command provides a network peer connections
dashboard that displays data from the getpeerinfo and getnetworkinfo RPCs
in a human-readable format. An optional integer argument from 0 to 4 may
be passed to see increasing levels of detail. (#19643)
A new bitcoin-cli -generate command, equivalent to RPC generatenewaddress
followed by generatetoaddress, can generate blocks for command line testing
purposes. This is a client-side version of the former generate RPC. See the
help for details. (#19133)
The bitcoin-cli -getinfo command now displays the wallet name and balance for
each of the loaded wallets when more than one is loaded (e.g. in multiwallet
mode) and a wallet is not specified with -rpcwallet. (#18594)
The connections field of bitcoin-cli -getinfo is now expanded to return a JSON
object with in, out and total numbers of peer connections. It previously
returned a single integer value for the total number of peer connections. (#19405)

New settings

The startupnotify option is used to specify a command to
execute when Bitcoin Core has finished with its startup
sequence. (#15367)

Wallet

Backwards compatibility has been dropped for two getaddressinfo RPC
deprecations, as notified in the 0.20 release notes. The deprecated label
field has been removed as well as the deprecated labels behavior of
returning a JSON object containing name and purpose key-value pairs. Since
0.20, the labels field returns a JSON array of label names. (#19200)
To improve wallet privacy, the frequency of wallet rebroadcast attempts is
reduced from approximately once every 15 minutes to once every 12-36 hours.
To maintain a similar level of guarantee for initial broadcast of wallet
transactions, the mempool tracks these transactions as a part of the newly
introduced unbroadcast set. See the "P2P and network changes" section for
more information on the unbroadcast set. (#18038)
The sendtoaddress and sendmany RPCs accept an optional verbose=True
argument to also return the fee reason about the sent tx. (#19501)
The wallet can create a transaction without change even when the keypool is
empty. Previously it failed. (#17219)
The -salvagewallet startup option has been removed. A new salvage command
has been added to the bitcoin-wallet tool which performs the salvage
operations that -salvagewallet did. (#18918)
A new configuration flag -maxapsfee has been added, which sets the max
allowed avoid partial spends (APS) fee. It defaults to 0 (i.e. fee is the
same with and without APS). Setting it to -1 will disable APS, unless
-avoidpartialspends is set. (#14582)
The wallet will now avoid partial spends (APS) by default, if this does not
result in a difference in fees compared to the non-APS variant. The allowed
fee threshold can be adjusted using the new -maxapsfee configuration
option. (#14582)
The createwallet, loadwallet, and unloadwallet RPCs now accept
load_on_startup options to modify the settings list. Unless these options
are explicitly set to true or false, the list is not modified, so the RPC
methods remain backwards compatible. (#15937)
A new send RPC with similar syntax to walletcreatefundedpsbt, including
support for coin selection and a custom fee rate, is added. The send RPC is
experimental and may change in subsequent releases. (#16378)
The estimate_mode parameter is now case-insensitive in the bumpfee,
fundrawtransaction, sendmany, sendtoaddress, send and
walletcreatefundedpsbt RPCs. (#11413)
The bumpfee RPC now uses conf_target rather than confTarget in the
options. (#11413)
fundrawtransaction and walletcreatefundedpsbt when used with the
lockUnspents argument now lock manually selected coins, in addition to
automatically selected coins. Note that locked coins are never used in
automatic coin selection, but can still be manually selected. (#18244)
The -zapwallettxes startup option has been removed and its functionality
removed from the wallet. This option was originally intended to allow for
rescuing wallets which were affected by a malleability attack. More recently,
it has been used in the fee bumping of transactions that did not signal RBF.
This functionality has been superseded with the abandon transaction feature. (#19671)
The error code when no wallet is loaded, but a wallet RPC is called, has been
changed from -32601 (method not found) to -18 (wallet not found).
(#20101)

Automatic wallet creation removed

Bitcoin Core will no longer automatically create new wallets on startup. It will
load existing wallets specified by -wallet options on the command line or in
bitcoin.conf or settings.json files. And by default it will also load a
top-level unnamed ("") wallet. However, if specified wallets don't exist,
Bitcoin Core will now just log warnings instead of creating new wallets with
new keys and addresses like previous releases did.

New wallets can be created through the GUI (which has a more prominent create
wallet option), through the bitcoin-cli createwallet or bitcoin-wallet create commands, or the createwallet RPC. (#15454, #20186)

Experimental Descriptor Wallets

Please note that Descriptor Wallets are still experimental and not all expected functionality
is available. Additionally there may be some bugs and current functions may change in the future.
Bugs and missing functionality can be reported to the issue tracker.

0.21 introduces a new type of wallet - Descriptor Wallets. Descriptor Wallets store
scriptPubKey information using output descriptors. This is in contrast to the Legacy Wallet
structure where keys are used to implicitly generate scriptPubKeys and addresses. Because of this
shift to being script based instead of key based, many of the confusing things that Legacy
Wallets do are not possible with Descriptor Wallets. Descriptor Wallets use a definition
of "mine" for scripts which is simpler and more intuitive than that used by Legacy Wallets.
Descriptor Wallets also uses different semantics for watch-only things and imports.

As Descriptor Wallets are a new type of wallet, their introduction does not affect existing wallets.
Users who already have a Bitcoin Core wallet can continue to use it as they did before without
any change in behavior. Newly created Legacy Wallets (which remains the default type of wallet) will
behave as they did in previous versions of Bitcoin Core.

The differences between Descriptor Wallets and Legacy Wallets are largely limited to non user facing
things. They are intended to behave similarly except for the import/export and watchonly functionality
as described below.

Creating Descriptor Wallets

Descriptor wallets are not the default type of wallet.

In the GUI, a checkbox has been added to the Create Wallet Dialog to indicate that a
Descriptor Wallet should be created. And a descriptors option has been added to createwallet RPC.
Setting descriptors to true will create a Descriptor Wallet instead of a Legacy Wallet.

Without those options being set, a Legacy Wallet will be created instead.

IsMine Semantics

IsMine refers to the function used to determine whether a script belongs to the wallet.
This is used to determine whether an output belongs to the wallet. IsMine in Legacy Wallets
returns true if the wallet would be able to sign an input that spends an output with that script.
Since keys can be involved in a variety of different scripts, this definition for IsMine can
lead to many unexpected scripts being considered part of the wallet.

With Descriptor Wallets, descriptors explicitly specify the set of scripts that are owned by
the wallet. Since descriptors are deterministic and easily enumerable, users will know exactly
what scripts the wallet will consider to belong to it. Additionally the implementation of IsMine
in Descriptor Wallets is far simpler than for Legacy Wallets. Notably, in Legacy Wallets, IsMine
allowed for users to take one type of address (e.g. P2PKH), mutate it into another address type
(e.g. P2WPKH), and the wallet would still detect outputs sending to the new address type
even without that address being requested from the wallet. Descriptor Wallets do not
allow for this and will only watch for the addresses that were explicitly requested from the wallet.

These changes to IsMine will make it easier to reason about what scripts the wallet will
actually be watching for in outputs. However for the vast majority of users, this change is
largely transparent and will not have noticeable effect.

Imports and Exports

In Legacy Wallets, raw scripts and keys could be imported to the wallet. Those imported scripts
and keys are treated separately from the keys generated by the wallet. This complicates the IsMine
logic as it has to distinguish between spendable and watchonly.

Descriptor Wallets handle importing scripts and keys differently. Only complete descriptors can be
imported. These descriptors are then added to the wallet as if it were a descriptor generated by
the wallet itself. This simplifies the IsMine logic so that it no longer has to distinguish
between spendable and watchonly. As such, the watchonly model for Descriptor Wallets is also
different and described in more detail in the next section.

To import into a Descriptor Wallet, a new importdescriptors RPC has been added that uses a syntax
similar to that of importmulti.

As Legacy Wallets and Descriptor Wallets use different mechanisms for storing and importing scripts and keys
the existing import RPCs have been disabled for descriptor wallets.
New export RPCs for Descriptor Wallets have not yet been added.

The following RPCs are disabled for Descriptor Wallets:

importprivkey
importpubkey
importaddress
importwallet
dumpprivkey
dumpwallet
importmulti
addmultisigaddress
sethdseed

Watchonly Wallets

A Legacy Wallet contains both private keys and scripts that were being watched.
Those watched scripts would not contribute to your normal balance. In order to see the watchonly
balance and to use watchonly things in transactions, an include_watchonly option was added
to many RPCs that would allow users to do that. However it is easy to forget to include this option.

Descriptor Wallets move to a per-wallet watchonly model. Instead an entire wallet is considered to be
watchonly depending on whether it was created with private keys disabled. This eliminates the need
to distinguish between things that are watchonly and things that are not within a wallet itself.

This change does have a caveat. If a Descriptor Wallet with private keys <em>enabled</em> has
a multiple key descriptor without all of the private keys (e.g. multi(...) with only one private key),
then the wallet will fail to sign and broadcast transactions. Such wallets would need to use the PSBT
workflow but the typical GUI Send, sendtoaddress, etc. workflows would still be available, just
non-functional.

This issue is worsened if the wallet contains both single key (e.g. wpkh(...)) descriptors and such
multiple key descriptors as some transactions could be signed and broadcast and others not. This is
due to some transactions containing only single key inputs, while others would contain both single
key and multiple key inputs, depending on which are available and how the coin selection algorithm
selects inputs. However this is not considered to be a supported use case; multisigs
should be in their own wallets which do not already have descriptors. Although users cannot export
descriptors with private keys for now as explained earlier.

BIP 44/49/84 Support

The change to using descriptors changes the default derivation paths used by Bitcoin Core
to adhere to BIP 44/49/84. Descriptors with different derivation paths can be imported without
issue.

SQLite Database Backend

Descriptor wallets use SQLite for the wallet file instead of the Berkeley DB used in legacy wallets.
This will break compatibility with any existing tooling that operates on wallets, however compatibility
was already being broken by the move to descriptors.

Wallet RPC changes

The upgradewallet RPC replaces the -upgradewallet command line option.
(#15761)
The settxfee RPC will fail if the fee was set higher than the -maxtxfee
command line setting. The wallet will already fail to create transactions
with fees higher than -maxtxfee. (#18467)
A new fee_rate parameter/option denominated in satoshis per vbyte (sat/vB)
is introduced to the sendtoaddress, sendmany, fundrawtransaction and
walletcreatefundedpsbt RPCs as well as to the experimental new send
RPC. The legacy feeRate option in fundrawtransaction and
walletcreatefundedpsbt still exists for setting a fee rate in BTC per 1,000
vbytes (BTC/kvB), but it is expected to be deprecated soon to avoid
confusion. For these RPCs, the fee rate error message is updated from BTC/kB
to sat/vB and the help documentation in BTC/kB is updated to BTC/kvB. The
send and sendtoaddress RPC examples are updated to aid users in creating
transactions with explicit fee rates. (#20305, #11413)
The bumpfee RPC fee_rate option is changed from BTC/kvB to sat/vB and the
help documentation is updated. Users are warned that this is a breaking API
change, but it should be relatively benign: the large (100,000 times)
difference between BTC/kvB and sat/vB units means that a transaction with a
fee rate mistakenly calculated in BTC/kvB rather than sat/vB should raise an
error due to the fee rate being set too low. In the worst case, the
transaction may send at 1 sat/vB, but as Replace-by-Fee (BIP125 RBF) is active
by default when an explicit fee rate is used, the transaction fee can be
bumped. (#20305)

GUI changes

Wallets created or loaded in the GUI will now be automatically loaded on
startup, so they don't need to be manually reloaded next time Bitcoin Core is
started. The list of wallets to load on startup is stored in
\<datadir\>/settings.json and augments any command line or bitcoin.conf
-wallet= settings that specify more wallets to load. Wallets that are
unloaded in the GUI get removed from the settings list so they won't load
again automatically next startup. (#19754)
The GUI Peers window no longer displays a "Ban Score" field. This is part of
changes in 0.20.1 and in this release to the handling of misbehaving
peers. Refer to "Changes regarding misbehaving peers" in the 0.20.1 release
notes for details. (#19512)

Low-level changes

RPC

To make RPC sendtoaddress more consistent with sendmany the following error
sendtoaddress codes were changed from -4 to -6:
Insufficient funds
Fee estimation failed
Transaction has too long of a mempool chain
The sendrawtransaction error code for exceeding maxfeerate has been changed from
-26 to -25. The error string has been changed from "absurdly-high-fee" to
"Fee exceeds maximum configured by user (e.g. -maxtxfee, maxfeerate)." The
testmempoolaccept RPC returns max-fee-exceeded rather than absurdly-high-fee
as the reject-reason. (#19339)
To make wallet and rawtransaction RPCs more consistent, the error message for
exceeding maximum feerate has been changed to "Fee exceeds maximum configured by user
(e.g. -maxtxfee, maxfeerate)." (#19339)

Tests

The BIP 325 default signet can be enabled by the -chain=signet or -signet
setting. The settings -signetchallenge and -signetseednode allow
enabling a custom signet.
The generateblock RPC allows testers using regtest mode to
generate blocks that consist of a custom set of transactions. (#17693)

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