![](https://images.hive.blog/p/C3TZR1g81UNaPs7vzNXHueW5ZM76DSHWEY7onmfLxcK2iPdiAa6tkfVRkpf9tvraQ9z55QS9fmMKbN32DMR4fCUEJKM2bGoquU7xeXZ7ZoKe6yrMrAtFTxA)


The [BitShares](https://bitshares.org) Core software has been updated to the [6.0.0 Protocol Release](https://github.com/bitshares/bitshares-core/milestone/34?closed=1). The codename of the 6.x releases is [*"Mekong"*](https://github.com/bitshares/bitshares-core/releases/tag/6.0.0). The Core software is used to build the validation nodes that perform consensus of all transactions on the BitShares blockchain. This release includes additions, improvements and _changes to the consensus protocol_.

The scheduled protocol upgrade time is **`Tuesday, January 11, 2022 14:00:00 UTC` (`2022-01-11T14:00:00Z`)**.

Documentation for users may be be found at [How BitShares Works](https://how.bitshares.works).

Documentation for BitShares developers may be found at the [BitShares Developer Portal](https://dev.bitshares.works).

* [Who should upgrade](#who-should-upgrade-6-0-0)
* [How to upgrade](#how-to-upgrade-6-0-0)
* [Binaries for download](#binaries-for-download-6-0-0)
* [Changes](#changes-6-0-0)
* [Release contributors](#release-contributors-6-0-0)

## <div id="who-should-upgrade-6-0-0"/> Who Should Upgrade

**All nodes need to be upgraded** to handle the [protocol upgrade](#protocol-6-0-0).

Note: some API changes may break existing client applications, as described in [API changes section](#api-6-0-0).

## <div id="how-to-upgrade-6-0-0"/> How To Upgrade

### Precautions

- All validation nodes must complete their upgrade prior to **Protocol Activation**.
- A _blockchain replay_ will automatically be performed after the validation node software is restarted. This typically takes a few hours on a modern CPU.

### How to Upgrade with Docker

The pre-built Docker image can be found on the [BitShares Core Docker page](https://hub.docker.com/r/bitshares/bitshares-core/) and can be downloaded with the following command.

```
docker pull bitshares/bitshares-core:6.0.0
```

### <div id="upgrade-from-source-6-0-0" /> How to Upgrade from Source Code

**Note:**

* The code base requires a compiler that supports the C++ 14 standard
* The minimum supported boost version is 1.58, the maximum is 1.74
* The minimum supported CMake version is 3.2
* For Ubuntu users, it is recommended to build in Ubuntu 20.04 LTS (Focal Fossa). Ubuntu 16.04 LTS (Xenial Xerus) is no longer supported.

#### Obtain the Source Code

The source code may be obtained by checking out the [6.0.0 tag](https://github.com/bitshares/bitshares-core/releases/tag/6.0.0).  Download the source at:

* [6.0.0.zip](https://github.com/bitshares/bitshares-core/archive/6.0.0.zip)
* [6.0.0.tar.gz](https://github.com/bitshares/bitshares-core/archive/6.0.0.tar.gz)

#### Build the Binaries

The binaries may be built by using your pre-existing process, or by following the standard instructions that can be found in the wiki:

* [Ubuntu](https://github.com/bitshares/bitshares-core/wiki/BUILD_UBUNTU)
* [macOS](https://github.com/bitshares/bitshares-core/wiki/Building-on-macOS)
* [Windows](https://github.com/bitshares/bitshares-core/wiki/BUILD_WIN32)

#### Deploy the Binaries

Your standard process for deploying the node software may be used. No additional requirements or precautions will be required to deploy the new release.

# <div id="binaries-for-download-6-0-0"/> Binaries for download

Binaries of the command line interface (CLI) wallet and the node software are pre-built and available for download.

Note:
* These binary builds are reproducible and were built using [Gitian](https://github.com/bitshares/bitshares-gitian/tree/6.0.0). Please check the [README of Gitian](https://github.com/bitshares/bitshares-gitian/blob/master/README.md) if you want to verify and/or contribute.
* Starting from version `6.0.0`, pre-built Linux binaries will not run on Ubuntu 16.04 LTS (Xenial).

|Platform|SHA256 Checksum|
|-|-|
|[Microsoft Windows](https://github.com/bitshares/bitshares-core/releases/download/6.0.0/bitshares-core-6.0.0-win64-bin.zip)|`b721383133d56fd2a6469a2aac73c92f7fe518f48a2d6a2484d1dd9dcf6c5527`|
|[Mac](https://github.com/bitshares/bitshares-core/releases/download/6.0.0/bitshares-core-6.0.0-macos64-bin.tar.bz2)|`c5c2ee313233aa06c42ea08f9dd747261dec61399ff1011b9f93b3553a84b868`|
|[Linux](https://github.com/bitshares/bitshares-core/releases/download/6.0.0/bitshares-core-6.0.0-linux-amd64-bin.tar.bz2)|`042740d4e816b80d909d8c82acbefb3ddd20e5b833cace2cfd1816be090eaac1`|

# <div id="changes-6-0-0"/> Changes

The changes for [6.0.0 Protocol Release](https://github.com/bitshares/bitshares-core/milestone/34?closed=1) are summarized below.

## <div id="protocol-6-0-0">Protocol</div>

|Description|Issue|Pull Request|
|-|-|-|
|Add no-collateral funding feature (SameT Funds)|[2351](https://github.com/bitshares/bitshares-core/issues/2351)|[2469](https://github.com/bitshares/bitshares-core/pull/2469), [2474](https://github.com/bitshares/bitshares-core/pull/2474), [2476](https://github.com/bitshares/bitshares-core/pull/2476), [2523](https://github.com/bitshares/bitshares-core/pull/2523)|
|Add simple collateralized P2P funding feature (Credit Offers and Credit Deals)|[2362](https://github.com/bitshares/bitshares-core/issues/2362)|[2479](https://github.com/bitshares/bitshares-core/pull/2479), [2502](https://github.com/bitshares/bitshares-core/pull/2502), [2511](https://github.com/bitshares/bitshares-core/pull/2511)|
|Add 3 new black swan response methods|[2467](https://github.com/bitshares/bitshares-core/issues/2467)|[2499](https://github.com/bitshares/bitshares-core/pull/2499), [2510](https://github.com/bitshares/bitshares-core/pull/2510)|
|Add missing asset authorization checks for certain operations|[972](https://github.com/bitshares/bitshares-core/issues/972), [973](https://github.com/bitshares/bitshares-core/issues/973)|[2468](https://github.com/bitshares/bitshares-core/pull/2468)|
|Add option for MPA owners to disable collateral bidding|[2281](https://github.com/bitshares/bitshares-core/issues/2281)|[2504](https://github.com/bitshares/bitshares-core/pull/2504), [2536](https://github.com/bitshares/bitshares-core/pull/2536)|
|Allow bitasset options to be updated after GS|[2282](https://github.com/bitshares/bitshares-core/issues/2282)|[2506](https://github.com/bitshares/bitshares-core/pull/2506)|
|Match force-settlements with margin calls at normal margin call fill price|[2481](https://github.com/bitshares/bitshares-core/issues/2481)|[2489](https://github.com/bitshares/bitshares-core/pull/2489)|
|Revive GSed bitassets based on ICR rather than MCR|[2290](https://github.com/bitshares/bitshares-core/issues/2290)|[2505](https://github.com/bitshares/bitshares-core/pull/2505)|
|Skip asset authorization checks for from_account for override_transfer|[2295](https://github.com/bitshares/bitshares-core/issues/2295)|[2465](https://github.com/bitshares/bitshares-core/pull/2465)|
|Update liquidity pool exchange operations to comply with whitelist and blacklist market settings|[2350](https://github.com/bitshares/bitshares-core/issues/2350)|[2462](https://github.com/bitshares/bitshares-core/pull/2462), [2507](https://github.com/bitshares/bitshares-core/pull/2507)|
|Fix a bug that some non-UIA asset issuer permission bits (e.g. `witness_fed_asset`) can be configured on UIA via `asset_update_operation`|-|[2499](https://github.com/bitshares/bitshares-core/pull/2499)|
|Allow borrowers to close debt positions even when there is no sufficient price feeds|-|[2499](https://github.com/bitshares/bitshares-core/pull/2499)|
|Allow updating an existing debt position or creating a new debt position if to trigger a margin call and the debt position is not fully filled but the remaining debt position's CR is higher than ICR|-|[2499](https://github.com/bitshares/bitshares-core/pull/2499)|
|Debt positions with CR not greater than MCR will pay margin call fees at the time of global settlement|-|[2489](https://github.com/bitshares/bitshares-core/pull/2489)|
 
## <div id="node-functionality-6-0-0"/> Node Functionality

|Description|Issue|Pull Request|
|-|-|-|
|Delete unneeded directories when writing object database to disk|-|[2485](https://github.com/bitshares/bitshares-core/pull/2485)|

## <div id="node-performance-6-0-0">Node Performance and Stability</div>

|Description|Issue|Pull Request|
|-|-|-|
|Clear operation_results when generating block|[2527](https://github.com/bitshares/bitshares-core/issues/2527)|[2475](https://github.com/bitshares/bitshares-core/pull/2475), [2528](https://github.com/bitshares/bitshares-core/pull/2528)|
|Remove BSIP-40 support for unused operations|-|[2482](https://github.com/bitshares/bitshares-core/pull/2482)|

## <div id="node-plugins-6-0-0"/> Node Plugins

|Description|Plugins|Issue|Pull Request|
|-|-|-|-|
|Fix liquidity pool deposit statistics|Market History|-|[2471](https://github.com/bitshares/bitshares-core/pull/2471)|
|Notify all related accounts on account creation|Account History|[265](https://github.com/bitshares/bitshares-core/issues/265)|[2480](https://github.com/bitshares/bitshares-core/pull/2480)|
|Fix a crash when starting the ElasticSearch plugin|ElasticSearch Operations|[2490](https://github.com/bitshares/bitshares-core/issues/2490)|[2495](https://github.com/bitshares/bitshares-core/pull/2495)|

## <div id="api-6-0-0"/> API

Please check the linked pull requests for more info and documentation.

|Description|Issue|Pull Request|
|-|-|-|
|The `get_block` API will return an empty `operation_results` field for blocks produced by nodes with version `6.0.0` or higher. The operation results can still be retrieved via `get_account_history` and related APIs.|-|[2475](https://github.com/bitshares/bitshares-core/pull/2475)|
|The unused `extensions` field is removed from `asset_settle_cancel_operation`|-|[2489](https://github.com/bitshares/bitshares-core/pull/2489)|
|The return value of `asset_settle_operation` is now a new type `extendable_operation_result`|-|[2499](https://github.com/bitshares/bitshares-core/pull/2499)|
|New APIs for querying SameT Funds|-|[2469](https://github.com/bitshares/bitshares-core/pull/2469)|
|New APIs for querying Credit Offers and Credit Deals|-|[2479](https://github.com/bitshares/bitshares-core/pull/2479)|
|Fix liquidity pool deposit statistics|-|[2471](https://github.com/bitshares/bitshares-core/pull/2471)|
|Fix liquidity pool history APIs|-|[2517](https://github.com/bitshares/bitshares-core/pull/2517)|

## Software Design

|Description|Issue|Pull Request|
|-|-|-|
|Add defensive check to mute SonarScanner warning|-|[2540](https://github.com/bitshares/bitshares-core/pull/2540)|

## Build Process and Continuous Integration (CI)

|Description|Issue|Pull Request|
|-|-|-|
|Build Docker images with Github Actions|[2472](https://github.com/bitshares/bitshares-core/issues/2472)|[2514](https://github.com/bitshares/bitshares-core/pull/2514)|
|Upgrade the Docker base image to Ubuntu 20.04 LTS (Focal Fossa)|-|[2473](https://github.com/bitshares/bitshares-core/pull/2473)|
|Fix Gitian Windows build string table overflow issue by using Ubuntu 20.04. LTS (Focal Fossa)|[2520](https://github.com/bitshares/bitshares-core/issues/2520)|[Gitian-50](https://github.com/bitshares/bitshares-gitian/pull/50)|
|Phase out Ubuntu 16.04|[2217](https://github.com/bitshares/bitshares-core/issues/2217), [Gitian-49](https://github.com/bitshares/bitshares-gitian/issues/49)|[Gitian-51](https://github.com/bitshares/bitshares-gitian/pull/51)|
|Add dependabot.yml for GitHub Actions|-|[2512](https://github.com/bitshares/bitshares-core/pull/2512)|
|Add OS version to cache key in sonar-scan workflow|-|[2486](https://github.com/bitshares/bitshares-core/pull/2486), [2487](https://github.com/bitshares/bitshares-core/pull/2487)|
|Update Sonar Scanner configuration|-|[2437](https://github.com/bitshares/bitshares-core/pull/2437), [2458](https://github.com/bitshares/bitshares-core/pull/2458), [2518](https://github.com/bitshares/bitshares-core/pull/2518)|

## Documentation

|Description|Issue|Pull Request|
|-|-|-|
|Fix an error in README.md|-|[2529](https://github.com/bitshares/bitshares-core/pull/2529), [2533](https://github.com/bitshares/bitshares-core/pull/2533), [2534](https://github.com/bitshares/bitshares-core/pull/2534)|

# <div id="release-contributors-6-0-0"/> Release Contributors

@abitmore (https://github.com/abitmore)
@xiao93 (https://github.com/xiao93)