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Merge pull request #75 from bitshares/bsip38-patch3

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Bsip38 patch3
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Abit 2018-04-16 01:27:19 +02:00 committed by GitHub
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4
bsip-0035.md
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@ -372,12 +372,12 @@ Assuming both orders are limit orders, they'll be processed as follows:
* If Alice's order is maker, use `$3 / 80` as match price; since Alice's order * If Alice's order is maker, use `$3 / 80` as match price; since Alice's order
is smaller, round in favor of Bob's order, so Alice will get is smaller, round in favor of Bob's order, so Alice will get
`round_down(50 CORE * $3 / 80 CORE) = round_down($1.6) = $1`, `round_down(50 CORE * $3 / 80 CORE) = round_down($1.6) = $1`,
and Bob will get `round_up($1 * 80 CORE / $3) = round_up($26.67) = $27`, and Bob will get `round_up($1 * 80 CORE / $3) = round_up(26.67 CORE) = 27 CORE`,
the effective price would be `$1 / 27 = $0.037`; the effective price would be `$1 / 27 = $0.037`;
* If Bob's order is maker, use `$19 / 500` as match price; since Alice's order * If Bob's order is maker, use `$19 / 500` as match price; since Alice's order
is smaller, round in favor of Bob's order, so Alice will get is smaller, round in favor of Bob's order, so Alice will get
`round_down(50 CORE * $19 / 500 CORE = round_down($1.9) = $1`, `round_down(50 CORE * $19 / 500 CORE = round_down($1.9) = $1`,
and Bob will get `round_up($1 * 500 CORE / $19) = round_up($26.3) = $27`, and Bob will get `round_up($1 * 500 CORE / $19) = round_up(26.3 CORE) = 27 CORE`,
the effective price would also be `$1 / 27 = $0.037`. the effective price would also be `$1 / 27 = $0.037`.
# Specifications # Specifications

12
bsip-0038.md
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@ -53,6 +53,13 @@ position in margin call territory.
## The Definition of Target Collateral Ratio ## The Definition of Target Collateral Ratio
For reference purpose, the collateral ratio of any given debt/short position
describes the ratio between the available collateral (e.g. core toke BTS) to
the debt that is owed (e.g. CNY, etc.) by the original borrower to the
blockchain. It is defined to be a dimensionless value as
`CR = collateral / (debt / feed_price)` where the price is measured in units of
the debt asset / units of the collateral asset (e.g. `CNY / BTS`).
"Target collateral ratio" is an optional value which can be set onto a short "Target collateral ratio" is an optional value which can be set onto a short
position, when the position being automatically liquidized (margin called), position, when the position being automatically liquidized (margin called),
sell no more than required collateral until collateral ratio of the position sell no more than required collateral until collateral ratio of the position
@ -108,7 +115,8 @@ target but not go too far beyond.
That said, if a short position got matched with a big limit order, after That said, if a short position got matched with a big limit order, after
partially filled, its collateral ratio should be **just** higher than specified partially filled, its collateral ratio should be **just** higher than specified
target collateral ratio. Which means if `max_debt_to_cover` has no target collateral ratio. Which means if `max_debt_to_cover` has no
fraction, need to plus it by one Satoshi; otherwise, need to round it up. fractional component (e.g. 5.00 as opposed to 5.23), need to plus it by one
Satoshi; otherwise, need to round it up.
An effectively same approach is to round down then add one Satoshi onto the An effectively same approach is to round down then add one Satoshi onto the
result. result.
@ -264,7 +272,7 @@ The new option need to be presented and can be used in UI after the hard fork.
When there are call orders to be filled, if `target_collateral_ratio` option When there are call orders to be filled, if `target_collateral_ratio` option
is set, UI need to show exact amount of collateral that another trader is able is set, UI need to show exact amount of collateral that another trader is able
to buy and exact amount of debt that need to pay according to the equation to buy and exact amount of debt that need to pay according to the equation
described above. described above. Note that this calculation will need to use the current `feed_price`.
# Discussion # Discussion