2022年1月22日， BTS 市场价格下跌，触发 bitCNY 黑天鹅事件，资不抵债的债仓被独立清算至资金池。

截止发文时，独立清算资金池内共计抵押品 43,755,308.66640 BTS （四千三百余万）， 对应债务 6,257,567.7942 bitCNY （六百余万）。
平均清算价约 0.143 bitCNY / BTS 。可以通过强清 bitCNY 的方式来即时获取池中的 BTS 。

在 BTS 价格继续下跌的过程中，出现一些资不抵债的债仓没有被自动清算的情况，经检查确认为代码 BUG 。
同时，这些没有被清算的债仓的存在，导致绝大部分债仓调整操作都无法完成，不能借款、不能增减抵押品，也不能部分还款，只能完全还款关闭债仓。（可能也有限价单无法正常成交的情况，待核实）
问题详细分析见 Github issue ： https://github.com/bitshares/bitshares-core/issues/2582

为应对这一问题，理事会在高度为 65663048 的区块执行了临时调整 bitCNY 参数的操作，触发了对资不抵债的债仓的独立清算，使债仓调整功能得以临时恢复。具体的调整参数的操作为：先将 MCR 调低到 1.599 ，再调回为 1.6 。其他参数不变。这一调整对其他债仓没有影响。

但是， BUG 仍然存在，今后如果 BTS 价格继续下跌导致新的资不抵债的债仓产生，仍然会出现同样的问题。
需要在下次版本升级（硬分叉）时才可能完全修复该问题。

在问题修复前，理事会临时应对方案为：
* 定期调整 bitCNY 参数以及时触发独立清算
* 目前暂定为每10分钟触发一次，时间为每个小时的5分、15分、25分、35分、45分、55分，后续可能根据实际情况调整
* 实现方式为提前批量发好提案并完成批准，保证可以定期执行。所有操作在链上可见，详见理事会账户 committee-account 。
* 每次触发独立清算之后，至新的资不抵债的债仓出现前，债仓调整操作可以正常进行。请有需要调整债仓的账户及时操作。
* 当喂价高出黑天鹅价较多时，由于不太可能触发独立清算，会暂停该调整操作。

以上，请知悉。

调整原因：“促销”。

调整内容：
更新智能资产参数操作手续费 asset_update_bitasset_operation 24.13047 BTS -> 4.82609 BTS
更新喂价人操作手续费 asset_update_feed_producers_operation 24.13047 BTS -> 4.82609 BTS
费池充值操作手续费 asset_fund_fee_pool_operation 24.13047 BTS -> 4.82609 BTS

另：1月21日调整内容：
P2P借贷池创建操作手续费 credit_offer_create_operation 1 BTS -> 0.4826 BTS , 交易大小费（每KB） 1 BTS -> 0.4826 BTS
P2P借贷池更新操作手续费 credit_offer_update_operation 1 BTS -> 0.09625 BTS , 交易大小费（每KB） 1 BTS -> 0.4826 BTS
闪电贷池创建操作手续费 samet_fund_create_operation 1 BTS -> 0.4826 BTS
闪电贷池更新操作手续费 samet_fund_update_operation 1 BTS -> 0.09625 BTS

2022-01-13 bitAssets parameter adjustments

Reason:
The Mekong update (BitShares 6.x) is done, migrating to a new model.

bitCNY parameter update:
* ICR reduced from 185% to 175%
* BSRM adjusted from "global settlement" to "individual settlement to fund"
* Remove limitation on maximum supply
* Enable force settlements

bitUSD parameter update:
* ICR reduced from 300% to 135%
* MCR reduced from 150% to 125%
* Disable collateral bidding
* Remove limitation on maximum supply
* Minimum feeds adjusted to 2 so that price feeds will show on GUI normally
* Update price feed producers list
* no update on BSRM because bitUSD is already globally settled. Will update after revived. The revive price is around 0.06 USD/BTS

bitEUR and bitRUBLE:
* BSRM adjusted from "global settlement" to "individual settlement to order"
* Maximum force settlement volume per hour adjusted from 0.01% to 0.5%

--------------------
Current bitCNY parameters:

ICR (Initial collateral ratio) 175%
MCR (Maintenance collateral ratio) 160%
MSSR (Maximum short-squeeze ratio) 105%
MCFR (Margin call fee rate) 3%
FSFP (Force settlement fee percent) 3%
FSO (Force settlement price offset) 2%
Force settlement delay 24 hour
Maximum force settlement volume per hour 0.5%
BSRM (Black swan response method) : individual settlement to fund
Minimum feeds 3
Price feed producers list:
1.2.183     hiquanta
1.2.35248   in.abit
1.2.987999  zapata42-witness
1.2.1031601 btspp-witness

Borrowing is enabled. No limitation on maximum supply.
Force-settlement is enabled.

--------------------------
Current bitUSD parameters:

ICR (Initial collateral ratio) 135%
MCR (Maintenance collateral ratio) 125%
MSSR (Maximum short-squeeze ratio) 105%
MCFR (Margin call fee rate) 3%
FSFP (Force settlement fee percent) 3%
FSO (Force settlement price offset) 2%
Force settlement delay 24 hour
Maximum force settlement volume per hour 0.5%
BSRM (Black swan response method) : global settlement
Minimum feeds 2
Price feed producers list:
1.2.183     hiquanta
1.2.14035   xn-delegate
1.2.35248   in.abit
1.2.738675  xbtsio-wallet
1.2.987999  zapata42-witness
1.2.1035733 syalon

Borrowing is enabled (but unable to borrow due to global settlement). No limitation on maximum supply.
Force-settlement is enabled.

2022年1月13日 bitUSD 参数调整：
* ICR从300%下调至135%
* ICR从150%下调至125%
* 竞价复活功能关闭
* 债务上限放开
* 最少喂价人 2 人（喂价正常显示，复活价0.06 USD/BTS）
* 更新喂价人清单

调整原因：
 6.0 湄公河版本升级完成，逐步过渡到新的运营模型

目前参数：
初始抵押率（抵押线） ICR 135%
维持抵押率（爆仓线） MCR 125%
最大轧空率（爆仓惩罚上限） MSSR 105%
爆仓费率 MCFR 3%
强清费率 FSFP 3%
强清价格偏移（强清补偿） FSO 2%
强清延时 24小时
每小时最大强清比例 0.5%
黑天鹅处置方式：全局清算（因已全局清算，暂不可修改，待复活后修改）
最少有效喂价人数 2
喂价人清单
1.2.183     hiquanta
1.2.14035   xn-delegate
1.2.35248   in.abit
1.2.738675  xbtsio-wallet
1.2.987999  zapata42-witness
1.2.1035733 syalon

借款功能目前开放，不设债务上限
强清功能开启

2022-01-10 bitCNY parameter update: ICR reduced from 195% to 185%

Reason:
To prepare for the Mekong update (BitShares 6.x) and migrate to a new model smoothly.

Current parameters:

ICR (Initial collateral ratio) 185%
MCR (Maintenance collateral ratio) 160%
MSSR (Maximum short-squeeze ratio) 105%
MCFR (Margin call fee rate) 3%
FSFP (Force settlement fee percent) 3%
FSO (Force settlement price offset) 2%
Force settlement delay 24 hour
Maximum force settlement volume per hour 0.5%
Minimum feeds 3
Price feed producers list:
1.2.183     hiquanta
1.2.35248   in.abit
1.2.987999  zapata42-witness
1.2.1031601 btspp-witness

Borrowing is enabled. The maximum supply is limited to 30,000,000 bitCNY.
Force-settlement is disabled.

2022-01-05 bitCNY parameter update: ICR reduced from 210% to 195%

Reason:
To prepare for the Mekong update (BitShares 6.x) and migrate to a new model smoothly.

Current parameters:

ICR (Initial collateral ratio) 195%
MCR (Maintenance collateral ratio) 160%
MSSR (Maximum short-squeeze ratio) 105%
MCFR (Margin call fee rate) 3%
FSFP (Force settlement fee percent) 3%
FSO (Force settlement price offset) 2%
Force settlement delay 24 hour
Maximum force settlement volume per hour 0.5%
Minimum feeds 3
Price feed producers list:
1.2.183     hiquanta
1.2.35248   in.abit
1.2.987999  zapata42-witness
1.2.1031601 btspp-witness

Borrowing is enabled. The maximum supply is limited to 30,000,000 bitCNY.
Force-settlement is disabled.

2021-12-30 bitCNY parameter update: ICR reduced from 240% to 210%

Reason:
To prepare for the Mekong update (BitShares 6.x) and migrate to a new model smoothly.

Current parameters:

ICR (Initial collateral ratio) 210%
MCR (Maintenance collateral ratio) 160%
MSSR (Maximum short-squeeze ratio) 105%
MCFR (Margin call fee rate) 3%
FSFP (Force settlement fee percent) 3%
FSO (Force settlement price offset) 2%
Force settlement delay 24 hour
Maximum force settlement volume per hour 0.5%
Minimum feeds 3
Price feed producers list:
1.2.183     hiquanta
1.2.35248   in.abit
1.2.987999  zapata42-witness
1.2.1031601 btspp-witness

Borrowing is enabled. The maximum supply is limited to 30,000,000 bitCNY.
Force-settlement is disabled.

2021-12-24 bitCNY parameter update: ICR reduced from 300% to 240%

Reason:
To prepare for the Mekong update (BitShares 6.x) and migrate to a new model smoothly.

Current parameters:

ICR (Initial collateral ratio) 240%
MCR (Maintenance collateral ratio) 160%
MSSR (Maximum short-squeeze ratio) 105%
MCFR (Margin call fee rate) 3%
FSFP (Force settlement fee percent) 3%
FSO (Force settlement price offset) 2%
Force settlement delay 24 hour
Maximum force settlement volume per hour 0.5%
Minimum feeds 3
Price feed producers list:
1.2.183     hiquanta
1.2.35248   in.abit
1.2.987999  zapata42-witness
1.2.1031601 btspp-witness

Borrowing is enabled. The maximum supply is limited to 30,000,000 bitCNY.
Force-settlement is disabled.