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Merge pull request #101 from MarkLTZ/2.0.9-release
Release v2.0.9
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| bitcoinz (2.0.9) stable; urgency=medium | ||
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| * 2.0.9 release. | ||
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| -- The BitcoinZ Community <[email protected]> Aug 2024 | ||
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| bitcoinz (2.0.9-rc2) stable; urgency=medium | ||
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| * 2.0.9-rc2 release. | ||
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| --- | ||
| name: "bitcoinz-2.0.9-rc2" | ||
| name: "bitcoinz-2.0.9" | ||
| enable_cache: true | ||
| distro: "debian" | ||
| suites: | ||
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| Original file line number | Diff line number | Diff line change |
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| Notable changes | ||
| =============== | ||
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| DoS Mitigation: Mempool Size Limit and Random Drop | ||
| -------------------------------------------------- | ||
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| This release adds a mechanism for preventing nodes from running out of memory | ||
| in the situation where an attacker is trying to overwhelm the network with | ||
| transactions. This is achieved by keeping track of and limiting the total | ||
| `cost` and `evictionWeight` of all transactions in the mempool. The `cost` of a | ||
| transaction is determined by its size in bytes, and its `evictionWeight` is a | ||
| function of the transaction's `cost` and its fee. The maximum total cost is | ||
| configurable via the parameter `mempooltxcostlimit` which defaults to | ||
| 80,000,000 (up to 20,000 txs). If a node's total mempool `cost` exceeds this | ||
| limit the node will evict a random transaction, preferentially picking larger | ||
| transactions and ones with below the standard fee. To prevent a node from | ||
| re-accepting evicted transactions, it keeps track of ones that it has evicted | ||
| recently. By default, a transaction will be considered recently evicted for 60 | ||
| minutes, but this can be configured with the parameter | ||
| `mempoolevictionmemoryminutes`. | ||
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| For full details see ZIP 401. | ||
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| Asynchronous Operations Incorrectly Reporting Success | ||
| ----------------------------------------------------- | ||
| We fixed an issue where asynchronous operations were sometimes reporting sucess | ||
| when they had actually failed. One way this could occur was when trying to use | ||
| `z_sendmany` to create a transaction spending coinbase funds in a way where | ||
| change would be generated (not a valid use of `z_sendmany`). In this case the | ||
| operation would erroneously report success, and the only way to see that the | ||
| transaction had actually failed was to look in the `debug.log` file. Such | ||
| operations will now correctly report that they have failed. | ||
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| Fake chain detection during initial block download | ||
| -------------------------------------------------- | ||
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| One of the mechanisms that `bitcoinzd` uses to detect whether it is in "initial | ||
| block download" (IBD) mode is to compare the active chain's cumulative work | ||
| against a hard-coded "minimum chain work" value. This mechanism (inherited from | ||
| Bitcoin Core) means that once a node exits IBD mode, it is either on the main | ||
| chain, or a fake alternate chain with similar amounts of work. In the latter | ||
| case, the node has most likely become the victim of a 50% + 1 adversary. | ||
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| Starting from this release, `bitcoinzd` additionally hard-codes the block hashes | ||
| for the activation blocks of each past network upgrade (NU). During initial | ||
| chain synchronization, and after the active chain has reached "minimum chain | ||
| work", the node checks the blocks at each NU activation height against the | ||
| hard-coded hashes. If any of them do not match, the node will immediately alert | ||
| the user and **shut down for safety**. | ||
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| Disabling old Sprout proofs | ||
| --------------------------- | ||
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| As part of our ongoing work to clean up the codebase and minimise the security | ||
| surface of `bitcoinzd`, we are removing `libsnark` from the codebase, and dropping | ||
| support for creating and verifying old Sprout proofs. Funds stored in Sprout | ||
| addresses are not affected, as they are spent using the hybrid Sprout circuit | ||
| (built using `bellman`) that was deployed during the Sapling network upgrade. | ||
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| This change has several implications: | ||
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| - `bitcoinzd` no longer verifies old Sprout proofs, and will instead assume they | ||
| are valid. This has a minor implication for nodes: during initial block | ||
| download, an adversary could feed the node fake blocks containing invalid old | ||
| Sprout proofs, and the node would accept the fake chain as valid. However, | ||
| as soon as the active chain contains at least as much work as the hard-coded | ||
| "minimum chain work" value, the node will detect this situation and shut down. | ||
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| - Shielded transactions can no longer be created before Sapling has activated. | ||
| This does not affect BitcoinZ itself, but will affect downstream codebases that | ||
| have not yet activated Sapling (or that start a new chain after this point and | ||
| do not activate Sapling from launch). Note that the old Sprout circuit is | ||
| [vulnerable to counterfeiting](https://z.cash/support/security/announcements/security-announcement-2019-02-05-cve-2019-7167/) | ||
| and should not be used in current deployments. | ||
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| - Starting from this release, the circuit parameters from the original Sprout | ||
| MPC are no longer required to start `bitcoinzd`, and will not be downloaded by | ||
| `fetch-params.sh`. They are not being automatically deleted at this time. | ||
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| Option parsing behavior | ||
| ----------------------- | ||
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| Command line options are now parsed strictly in the order in which they are | ||
| specified. It used to be the case that `-X -noX` ends up, unintuitively, with X | ||
| set, as `-X` had precedence over `-noX`. This is no longer the case. Like for | ||
| other software, the last specified value for an option will hold. | ||
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| Low-level RPC changes | ||
| --------------------- | ||
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| - Bare multisig outputs to our keys are no longer automatically treated as | ||
| incoming payments. As this feature was only available for multisig outputs for | ||
| which you had all private keys in your wallet, there was generally no use for | ||
| them compared to single-key schemes. Furthermore, no address format for such | ||
| outputs is defined, and wallet software can't easily send to it. These outputs | ||
| will no longer show up in `listtransactions`, `listunspent`, or contribute to | ||
| your balance, unless they are explicitly watched (using `importaddress` or | ||
| `importmulti` with hex script argument). `signrawtransaction*` also still | ||
| works for them. | ||
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| View shielded information in wallet transactions | ||
| ------------------------------------------------ | ||
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| In previous `bitcoinzd` versions, to obtain information about shielded transactions | ||
| you would use either the `z_listreceivedbyaddress` RPC method (which returns all | ||
| notes received by an address) or `z_listunspent` (which returns unspent notes, | ||
| optionally filtered by addresses). There were no RPC methods that directly | ||
| returned details about spends, or anything equivalent to the `gettransaction` | ||
| method (which returns transparent information about in-wallet transactions). | ||
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| This release introduces a new RPC method `z_viewtransaction` to fill that gap. | ||
| Given the ID of a transaction in the wallet, it decrypts the transaction and | ||
| returns detailed shielded information for all decryptable new and spent notes, | ||
| including: | ||
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| - The address that each note belongs to. | ||
| - Values in both decimal ZEC and zatoshis. | ||
| - The ID of the transaction that each spent note was received in. | ||
| - An `outgoing` flag on each new note, which will be `true` if the output is not | ||
| for an address in the wallet. | ||
| - A `memoStr` field for each new note, containing its text memo (if its memo | ||
| field contains a valid UTF-8 string). | ||
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| Information will be shown for any address that appears in `z_listaddresses`; | ||
| this includes watch-only addresses linked to viewing keys imported with | ||
| `z_importviewingkey`, as well as addresses with spending keys (both generated | ||
| with `z_getnewaddress` and imported with `z_importkey`). | ||
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| Build system | ||
| ------------ | ||
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| - The `--enable-lcov`, `--disable-tests`, and `--disable-mining` flags for | ||
| `zcutil/build.sh` have been removed. You can pass these flags instead by using | ||
| the `CONFIGURE_FLAGS` environment variable. For example, to enable coverage | ||
| instrumentation (thus enabling "make cov" to work), call: | ||
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| ``` | ||
| CONFIGURE_FLAGS="--enable-lcov --disable-hardening" ./zcutil/build.sh | ||
| ``` | ||
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| - The build system no longer defaults to verbose output. You can re-enable | ||
| verbose output with `./zcutil/build.sh V=1` |
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