v0.17.7

1. Add the finalized block concept. Finalized blocks cannot be reorged, which protects the network against deep reorgs.
2. Add the -maxreorgdepth configuration to configure at what depth block are considered final. Default is 10.

1.增加不可逆配置，防止51%攻击。
2. maxreorgdepth 默认 10。

v0.17.6

1. fixed Bitcoin Core CVE-2018-17144
2. add same checkpoint

v0.17.5

1 . 完美兼容矿池，不需要矿池做任何更改。
2 . 在531806高度 激活智能合约。
3 . 修正一些日志文件和配置问题。

1. perfectly compatible with miner pools, no need to change any miner pool.
2. 531806 activate smart contracts.
3. fix some log files and configuration issues.

注意：
如果您在531806高度之后升级，您可能会在531805 不再向前走，这时您需要调用 reconsiderblock + 531806 hash即可。

v0.17.4

回退代码，智能合约激活推迟。

v0.17.3

用另外一种办法解决了，矿池兼容的问题。

v0.17.2

解决矿池兼容性问题。

v0.17.1

SBTC升级说明：
1、PROTOCOL_VERSION升级为70017
2、支持智能合约，将在高度530555激活智能合约功能，在此高度之前兼容旧版本，
交易所、钱包和矿池只需在此高度前升级即可。
3、智能合约相关文档请参阅：
https://github.com/superbitcoin/superbitcoin-doc
《SBTC智能合约操作使用手册.md》
4、升级文件新增：
log.conf 用于打印日志文件的配置。
5、升级配置文件“sbtc.conf”中
logevents=0用于打印合约日志存储开关，默认0为关闭。
6、目前只支持在linux下用cmake的编译，默认为静态编译。

SBTC upgrade instructions:
1, PROTOCOL_VERSION upgrade to 70017
2, support smart contracts, will activate the smart contract function at a height of 530555, compatible with the old version before this height,
Exchanges, wallets and mining pools need to be upgraded before this height.
3, smart contract related documents see:
Https://github.com/superbitcoin/superbitcoin-doc
"SBTC Smart Contract Operation Manual.md"
4, update file added:
“Log.conf” is used to print the configuration of the log file.
5, upgrade the configuration file“sbtc.conf”
“Logevents=0” is used to print the contract log storage switch, default 0 is off.
6, currently only supported in the Linux cmake compiler, the default is static compilation.

v0.16.2

sbtc升级说明
1、基础版本是v0.15.1
2、加上双重防重放攻击
3、修改难度调整算法
4、修改DNS种子节点

SBTC upgrade instructions

1. The basic version is v0.15.1
2. Added double-layer prevention of replay Attack
3. Modify the difficulty adjustment algorithm
4. Modify DNS seed nodes

v0.16.0rc5

0.16.0 release candidate 5

This version mainly completes the following points:
change difficulty dec