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David A. Harding 5 years ago
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@ -70,10 +70,14 @@ New RPCs
- `getbalances` returns an object with all balances (`mine`,
`untrusted_pending` and `immature`). Please refer to the RPC help of
`getbalances` for details. The new RPC is intended to replace
`getunconfirmedbalance` and the balance fields in `getwalletinfo`, as well as
`getbalance`. The old calls may be removed in a future version.
`getbalance`, `getunconfirmedbalance`, and the balance fields in
`getwalletinfo`. These old calls and fields may be removed in a
future version. (#15930, #16239)
- A new `setwalletflag` RPC sets/unsets flags for an existing wallet.
- `setwalletflag` sets and unsets wallet flags that enable or disable
features specific to that existing wallet, such as the new
`avoid_reuse` feature documented elsewhere in these release notes.
(#13756)
Updated RPCs
------------
@ -81,82 +85,68 @@ Updated RPCs
Note: some low-level RPC changes mainly useful for testing are described in the
Low-level Changes section below.
- The `sendmany` RPC had an argument `minconf` that was not well specified and
would lead to RPC errors even when the wallet's coin selection would succeed.
The `sendtoaddress` RPC never had this check, so to normalize the behavior,
`minconf` is now ignored in `sendmany`. If the coin selection does not
succeed due to missing coins, it will still throw an RPC error. Be reminded
that coin selection is influenced by the `-spendzeroconfchange`,
`-limitancestorcount`, `-limitdescendantcount` and `-walletrejectlongchains`
command line arguments.
- Several RPCs have been updated to include an "avoid_reuse" flag, used
to control whether already used addresses should be left out or
included in the operation. These include:
- createwallet
- getbalance
- getbalances
- sendtoaddress
In addition, `sendtoaddress` has been changed to avoid partial spends
when `avoid_reuse` is enabled (if not already enabled via the
`-avoidpartialspends` command line flag), as it would otherwise risk
using up the "wrong" UTXO for an address reuse case.
The listunspent RPC has also been updated to now include a "reused"
bool, for nodes with "avoid_reuse" enabled.
- The `getblockstats` RPC is faster for fee calculation by using
BlockUndo data. Also , `-txindex` is no longer required and
`getblockstats` works for all non-pruned blocks.
- `createwallet` can now create encrypted wallets if a non-empty
passphrase is specified.
- The `utxoupdatepsbt` RPC method has been updated to take a
`descriptors` argument. When provided, input and output scripts and
keys will be filled in when known, and P2SH-witness inputs will be
filled in from the UTXO set when a descriptor is provided that shows
they're spending segwit outputs.
See the RPC help text for full details.
- The -maxtxfee setting no longer has any effect on non-wallet RPCs.
The `sendrawtransaction` and `testmempoolaccept` RPC methods previously
accepted an `allowhighfees` parameter to fail the mempool acceptance in case
the transaction's fee would exceed the value of the command line argument
`-maxtxfee`. To uncouple the RPCs from the global option, they now have a
hardcoded default for the maximum transaction fee, that can be changed for
both RPCs on a per-call basis with the `maxfeerate` parameter. The
`allowhighfees` boolean option has been removed and replaced by the
`maxfeerate` numeric option.
- In getmempoolancestors, getmempooldescendants, getmempoolentry and
getrawmempool RPCs, to be consistent with the returned value and other
RPCs such as getrawtransaction, vsize has been added and size is now
deprecated. size will only be returned if bitcoind is started with
`-deprecatedrpc=size`.
- The RPC `getwalletinfo` response now includes the `scanning` key with
an object if there is a scanning in progress or `false` otherwise.
Currently the object has the scanning duration and progress.
- `createwallet` now returns a warning if an empty string is used as an
encryption password, and does not encrypt the wallet, instead of
raising an error. This makes it easier to disable encryption but also
specify other options when using the `bitcoin-cli` tool.
- `sendmany` no longer has a `minconf` argument. This argument was not
well specified and would lead to RPC errors even when the wallet's
coin selection succeeded. Users who want to influence coin selection
can use the existing `-spendzeroconfchange`, `-limitancestorcount`,
`-limitdescendantcount` and `-walletrejectlongchains` configuration
arguments. (#15596)
- `getbalance` and `sendtoaddress`, plus the new RPCs `getbalances` and
`createwallet`, now accept an "avoid_reuse" parameter that controls
whether already used addresses should be included in the operation.
Additionally, `sendtoaddress` will avoid partial spends when
`avoid_reuse` is enabled even if this feature is not already enabled
via the `-avoidpartialspends` command line flag because not doing so
would risk using up the "wrong" UTXO for an address reuse case.
(#13756)
- `listunspent` now returns a "reused" bool for each output if the
wallet flag "avoid_reuse" is enabled. (#13756)
- `getblockstats` now uses BlockUndo data instead of the transaction
index, making it much faster, no longer dependent on the `-txindex`
configuration option, and functional for all non-pruned blocks.
(#14802)
- `utxoupdatepsbt` now accepts a `descriptors` parameter that will fill
out input and output scripts and keys when known. P2SH-witness inputs
will be filled in from the UTXO set when a descriptor is provided that
shows they're spending segwit outputs. See the RPC help text for full
details. (#15427)
- `sendrawtransaction` and `testmempoolaccept` no longer accept a
`allowhighfees` parameter to fail mempool acceptance if the
transaction fee exceedes the value of the configuration option
`-maxtxfee`. Now there is a hardcoded default maximum feerate that
can be changed when calling either RPC using a `maxfeerate` parameter.
(#15620)
- `getmempoolancestors`, `getmempooldescendants`, `getmempoolentry`, and
`getrawmempool` no longer return a `size` field unless the
configuration option `-deprecatedrpc=size` is used. Instead a new
`vsize` field is returned with the transaction's virtual size
(consistent with other RPCs such as `getrawtransaction`). (#15637)
- `getwalletinfo` now includes a `scanning` field that is either `false`
(no scanning) or an object with information about the duration and
progress of the wallet's scanning historical blocks for transactions
affecting its balances. (#15730)
- `createwallet` accepts a new `passphrase` parameter. If set, this
will create the new wallet encrypted with the given passphrase. If
unset (the default) or set to an empty string, no encryption will be
used. (#16394)
- `getmempoolentry` now provides a `weight` field containing the
transaction weight as defined in BIP 141.
transaction weight as defined in BIP141. (#16647)
Deprecated or removed RPCs
--------------------------
- The `totalFee` option of the `bumpfee` RPC has been deprecated and will be
removed in 0.20. To continue using this option start with
`-deprecatedrpc=totalFee`. See the `bumpfee` RPC help text for more details.
- `bumpfee` no longer accepts a `totalFee` option unless the
configuration parameter `deprecatedrpc=totalFee` is specified. This
parameter will be fully removed in a subsequent release. (#15996)
P2P changes
-----------
@ -164,23 +154,31 @@ P2P changes
- BIP 61 reject messages were deprecated in v0.18. They are now disabled
by default, but can be enabled by setting the `-enablebip61` command
line option. BIP 61 reject messages will be removed entirely in a
future version of Bitcoin Core.
- The default value for the -peerbloomfilters configuration option (and,
thus, NODE_BLOOM support) has been changed to false. This resolves
well-known DoS vectors in Bitcoin Core, especially for nodes with
spinning disks. It is not anticipated that this will result in a
significant lack of availability of NODE_BLOOM-enabled nodes in the
coming years, however, clients which rely on the availability of
NODE_BLOOM-supporting nodes on the P2P network should consider the
process of migrating to a more modern (and less trustful and
privacy-violating) alternative over the coming years.
future version of Bitcoin Core. (#14054)
- To eliminate well-known denial-of-service vectors in Bitcoin Core,
especially for nodes with spinning disks, the default value for the
`-peerbloomfilters` configuration option has been changed to false.
This prevents Bitcoin Core from sending the BIP111 NODE_BLOOM service
flag, accepting BIP37 bloom filters, or serving merkle blocks or
transactions matching a bloom filter. Users who still want to provide
bloom filter support may either set the configuration option to true
to re-enable both BIP111 and BIP37 support or enable just BIP37
support for specific peers using the updated `-whitelist` and
`-whitebind` configuration options described elsewhere in these
release notes. For the near future, lightweight clients using public
BIP111/BIP37 nodes should still be able to connect to older versions
of Bitcoin Core and nodes that have manually enabled BIP37 support,
but developers of such software should consider migrating to either
using specific BIP37 nodes or an alternative transaction filtering
system. (#16152)
Miscellaneous CLI Changes
-------------------------
- The `testnet` field in `bitcoin-cli -getinfo` has been renamed to
`chain` and now returns the current network name as defined in BIP70
(main, test, regtest).
(main, test, regtest). (#15566)
Low-level changes
=================
@ -188,43 +186,39 @@ Low-level changes
RPC
---
- Soft fork reporting in the `getblockchaininfo` return object has been
updated. For full details, see the RPC help text. In summary:
- The `bip9_softforks` sub-object is no longer returned
- The `softforks` sub-object now returns an object keyed by soft fork name,
rather than an array
- Each softfork object in the `softforks` object contains a `type`
value which is either `buried` (for soft fork deployments where the
activation height is hard-coded into the client implementation), or
`bip9` (for soft fork deployments where activation is controlled by
BIP 9 signaling).
- `getblockchaininfo` no longer returns a `bip9_softforks` object.
Instead, information has been moved into the `softforks` object and
an additional `type` field describes how Bitcoin Core determines
whether that soft fork is active (e.g. BIP9 or BIP90). See the RPC
help for details. (#16060)
- `getblocktemplate` no longer returns a `rules` array containing `CSV`
and `segwit` (the BIP 9 deployments that are currently in active
state).
and `segwit` (the BIP9 deployments that are currently in active
state). (#16060)
Tests
-----
- The regression test chain, that can be enabled by the `-regtest` command line
flag, now requires transactions to not violate standard policy by default.
Making the default the same as for mainnet, makes it easier to test mainnet
behavior on regtest. Be reminded that the testnet still allows non-standard
txs by default and that the policy can be locally adjusted with the
`-acceptnonstdtxn` command line flag for both test chains.
- The regression test chain enabled by the `-regtest` command line flag
now requires transactions to not violate standard policy by default.
This is the same default used for mainnet and makes it easier to test
mainnet behavior on regtest. Note that the testnet still allows
non-standard txs by default and that the policy can be locally
adjusted with the `-acceptnonstdtxn` command line flag for both test
chains. (#15891)
Configuration
------------
- An error is issued where previously a warning was issued when a setting in
the config file was specified in the default section, but not overridden for
the selected network. This change takes only effect if the selected network
is not mainnet.
- A setting specified in the default section but not also specified in a
network-specific section (e.g. testnet) will now produce a error
preventing startup instead of just a warning unless the network is
mainnet. This prevents settings intended for mainnet from being
applied to testnet or regtest. (#15629)
- On platforms supporting `thread_local`, log lines can be prefixed with
the name of the thread that caused the log. To enable this behavior,
use `-logthreadnames=1`.
use `-logthreadnames=1`. (#15849)
Network
-------
@ -235,44 +229,41 @@ Network
peers' announcements were received. In this release, the download logic has
changed to randomize the fetch order across peers and to prefer sending
download requests to outbound peers over inbound peers. This fixes an issue
where inbound peers can prevent a node from getting a transaction.
where inbound peers could prevent a node from getting a transaction.
(#14897, #15834)
Wallet
------
- When in pruned mode, a rescan that was triggered by an `importwallet`,
`importpubkey`, `importaddress`, or `importprivkey` RPC will only fail when
blocks have been pruned. Previously it would fail when `-prune` has been set.
This change allows to set `-prune` to a high value (e.g. the disk size) and
the calls to any of the import RPCs would fail when the first block is
pruned.
`importpubkey`, `importaddress`, or `importprivkey` RPC will only fail
when blocks have been pruned. Previously it would fail when `-prune`
has been set. This change allows setting `-prune` to a high value
(e.g. the disk size) without the calls to any of the import RPCs
failing until the first block is pruned. (#15870)
- When creating a transaction with a fee above `-maxtxfee` (default 0.1
BTC), the RPC commands `walletcreatefundedpsbt` and
`fundrawtransaction` will now fail instead of rounding down the fee.
Beware that the `feeRate` argument is specified in BTC per kilobyte,
not satoshi per byte.
Be aware that the `feeRate` argument is specified in BTC per 1,000
vbytes, not satoshi per vbyte. (#16257)
- A new wallet flag `avoid_reuse` has been added (default off). When
enabled, a wallet will distinguish between used and unused addresses,
and default to not use the former in coin selection.
Rescanning the blockchain is required, to correctly mark previously
used destinations.
Together with "avoid partial spends" (present as of Bitcoin v0.17),
this addresses a serious privacy issue where a malicious user can
track spends by peppering a previously paid to address with near-dust
outputs, which would then be inadvertently included in future
payments.
and default to not use the former in coin selection. When setting
this flag on an existing wallet, rescanning the blockchain is required
to correctly mark previously used destinations. Together with "avoid
partial spends" (added in Bitcoin Core v0.17.0), this can eliminate a
serious privacy issue where a malicious user can track spends by
sending small payments to a previously-paid address that would then
be included with unrelated inputs in future payments. (#13756)
Build system changes
--------------------
- Python >=3.5 is now required by all aspects of the project. This
includes the build systems, test framework and linters. The previously
supported minimum (3.4), was E OL in March 2019. See #14954 for more
details.
supported minimum (3.4), was EOL in March 2019. (#14954)
- The minimum supported miniUPnPc API version is set to 10. This keeps
compatibility with Ubuntu 16.04 LTS and Debian 8 `libminiupnpc-dev`
@ -280,7 +271,7 @@ Build system changes
[CVE-2017-8798](https://security-tracker.debian.org/tracker/CVE-2017-8798)
(in jessie only) and
[CVE-2017-1000494](https://security-tracker.debian.org/tracker/CVE-2017-1000494)
(both in jessie and in stretch).
(both in jessie and in stretch). (#15993)
Credits
=======

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