►
From YouTube: To Net Zero with Verifiable Credentials
Description
A presentation at the Hyperledger Climate Action and Accounting Special Interest Group on August 10, 2021 featuring a team from @Siemens sharing how to use verifiable credentials to confidentiality share information in supply chains to drive industrial production towards net zero carbon emission.
More about the Climate Action and Accounting SIG is at: https://wiki.hyperledger.org/display/CASIG
----
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B
C
Yeah,
so
a
good
day
to
all
of
you
thanks
a
lot
david
robin
for
giving
us
here
the
opportunity
to
present
to
the
climate
action
special
interest
group,
so
my
name
is
andres
kint,
I'm
in
charge
of
and
with
me
are
two
colleagues
one
is
florian
and
the
other
one
jonas,
who
actually
is
on
behalf
of
maxia,
who
got
stuck
in
tuscany
without
internet
lucky
guy
is
froyan.
Jonas.
Would
you
like
to
briefly
introduce
yourselves.
E
All
right
it
doesn't.
Let
me
switch
off
my
cam.
I
switch
on
my
camera,
so
sorry
for
that
within
the
team
of
green
forest
stadium,
the
solution
that
we're
gonna
gonna
present
in
this
case
and
I'm
very
happy
to
to
get
in
touch
and
exchange
on
the
ideas
and
solutions
that
we
brought
today
so
looking
forward
to
the
next
hour.
C
We
are
here
really
not
to
talk
about
forests
that
are
dying
or
the
the
greater
story,
but
we
want
to
talk
about
the
business
impact
that
sustainability
has
and
just
to
kick
it
off.
We
have
two
quotes
here:
one
coming
from
larry
think
heading
blackrock,
one
of
the
biggest
investment
companies
pointing
out
how
important
sustainability
is
for
investments
and
on
the
other
side,
from
the
political
direction.
C
Investors
sentiments
is
another
big
driver
too.
I
just
had
this
quote,
but
it's
not
just
from
the
big
companies.
It's
also
the
smaller
funds,
the
the
individual
investors.
They
also
look
for
green
investments.
They
look
for
what
they
where
they
put
their
money
and
customer
demand
is
another
big
driver,
just
a
number
related
to
this.
On
the
right
hand,
side
the
number
of
sold
sustainability
sold
sustainability,
market
products
is
around
113
billion,
and
this
was
in
2019.
C
So
we
see
the
consumer
side
being
really
strong
and
being
also
very
sensitive
on
on
the
brand.
So
if
something
goes
wrong,
the
brand
really
can
suffer
quite
significantly
and
finally,
because
of
things
like
brand
perception,
there's
corporate
risk
and
in
the
corporate
politics
corporate
strategies,
it's
of
course
a
lot
about
risk
mitigation,
about
being
careful
how
the
business
runs
and
so
on
yeah.
C
C
But
now
the
next
challenge
is
really
carbon
pricing.
It's
really
understanding
what
it
means,
understanding
what
is
in
the
first
place
the
product
carbon
footprint
of
a
product
that
comes
out
here,
and
I
think
we
we
actually
have
a
picture
here
on
one
of
these
boxes
that
comes
out
here,
and
it's
not
only
about
our
products
so
yeah.
If
you
can
move
on
it's
about
the
products
of
course
that
anybody
else
produces
as
well.
C
C
And
we
have
first
of
all
looked
into
sort
of
the
standards
that
exist
in
this
context?
How
we,
how
we
can
measure
it
and
it
touches
very
much
on
the
way
information
is
exchanged,
it's
it's
sort
of
exchange
in
a
in
a
verifiable
way,
but
there's
a
there's,
a
big
gap.
Basically,
that
has
to
be
addressed
and
with
this
I
hand
over
to
florian,
to
to
talk
about
the
the
first
part
that
we
addressed.
D
D
This
also
includes
the
downstream
so
the
use
phase,
but
I'm
going
to
basically
not
go
into
that
now
since
and
it
increases
complexity
and
reduces
the
understanding
of
the
concept
so
for
the
foreground
system.
As
I
mentioned,
we
have
very
good
information.
We
have
very
good
data
and
if
you
look
in
detail
into
one
of
these
processes,
you
might
see,
for
example,
for
this
s7
box
that
we
just
saw
a
soldering
process.
D
So
we
have
all
the
flows
of
material
coming
in
here.
The
solder,
the
energy
and
heat
demand,
for
example,
or
cooling
and,
of
course,
direct
emissions
and
going
to
the
ecosphere
in
blue
here,
which
is
in
elementary
flow,
then,
but
most
of
it
is
actually
coming
from
suppliers.
So
it's
being
modeled
in
our
background
system.
D
D
This,
of
course,
has
let's
say
the
inconvenience
of
first
of
all,
you
have
to
basically
assess
almost
all
the
products
of
your
suppliers
that
you're
buying.
Secondly,
really
the
transparency
of
the
processes
that
you're
assessing
is
relatively
low,
meaning
most
of
the
product
carbon
footprint
emissions
in
your
manufacturing
is
just
estimated.
D
How
can
we
change
this
now?
Since
I
mean
this
is
quite
an
interesting
way
of
calculating
something
that
you
put
a
price
tag
on
into
already
or
in
the
future?
Well,
they're.
Basically,
three
ways
that
I
try
to
sketch
here.
The
first
one
is
what
the
car
manufacturers,
for
example,
have
done
with
their
suppliers,
since
they
have
a
pretty
strict
management
of
their
supply
chain.
They
are
asking
their
suppliers
for
life
cycle
inventory
data.
D
Customers,
you
provide
your
part
to
with
so
this
didn't
really
scale.
The
second
option
is
to
kind
of
not
go
with
life
cycle,
inventory
data
or
an
aggregated
disaggregated
database
processes
and
provided
by
suppliers,
but
to
go
with
aggregated
databases,
database
processes
or
not
database
process,
but
processes
from
suppliers.
The
supplier
basically
calculates
his
own
carbon
footprint
that
he
has
foreground
data
for
plus
everything
that
he
received
from
his
suppliers,
and
then
he
creates
a
black
box.
D
So
he
makes
all
this
a
black
box
and
only
communicates
the
elementary
flows,
the
blue
arrows
basically
to
his
customer.
This
has
a
couple
challenges,
of
course.
First
of
all,
there's
still
a
lot
of
transparency
in
this,
since,
with
all
the
elementary
flows
me
as
a
manufacturer,
I
can
still
somewhat
backwards
engineer
certain
processes
that
I'm
provided
for
by
my
supplier
and
estimate
what
their
processes
and
efficiencies
are,
which
my
suppliers
might
not
wanna
provide
me
with.
D
In
order
to
make
sure
that
it's
used,
that
I
can
use
it
in
a
representative
way
and
in
exactly
the
way
that
my
supplier
intended
it
and
to
use.
So
the
assessment
process
of
this
formerly
estimated
process
in
the
future
hopefully
looks
the
way
that
each
of
my
suppliers
calculates
his
product
carbon
footprint
of
his
product.
Exactly
the
way
that
I
did
it
with
my
primary
data
and
passes
on
co2
equivalents,
plus
the
information
that's
necessary
in
order
for
me
to
make
representative
use
of
it
and
avoid
double
accounting.
Things
like
that.
D
We
have
a
couple
other
construction
sites
that
we're
working
on
on
for
two
of
them
are,
let's
say,
just
methodological
parts
may
mainly
to
create
a
set
of
rules
that
enables
to
have
this
linear
calculation
of
product
components
throughout
the
supply
chain.
Secondly,
to
define
the
yeah
communication
parameters
that
are
passed
on
and
the
last
part,
and
most
important
part
for
you,
since
it
has
this
technical
aspect,
is
how
can
we
create
and
trust
them
into
the
data
that
we
are
being
provided
for
by
our
suppliers?
C
C
It
goes
in
the
direction
of
saying,
okay,
we
need
some
form
of
aggregate
at
the
end
about
a
product,
but
it
has
to
be
trusted.
So
we
cannot.
Possibly,
you
know,
have
the
full
transparency,
so
it
has
to
be
negate,
but
it
has
to
be
trusted
in
a
way
that
people
can
verify
it
and
just
taking
these
terms,
verification
trust
and
so
on
sort
of
brings
typically
different
roles
up.
C
Something
based
on
the
credentials
being
issued
by
by
an
issuer
and
exactly
these
kind
of
roles
are,
in
the
middle
of
verifiable
credentials,
very
close
to
hyperledger,
of
course,
so
in
the
form
of
the
implementations
in
areas
in
indy,
and
we
simply
use
this
kind
of
approach
in
order
to
solve
this
trust,
trustworthy,
aggregation
challenge,
and
we
do
this
in
a
way
of
chaining.
These
three
roles
along
the
supply
chain
and
the
the
key
sort
of
element
is
that
the
question
is
always:
where
does
the
trust
come
from?
C
If
we
talk
about
trustworthiness,
trust
has
to
come
from
somewhere,
you
could
think
of
secure
memory
somewhere
in
the
production
facilities
that
the
even
the
manufacturer
kind
of
tamper
with,
but
in
our
approach
we
actually
think
about
another
organization,
typically
a
certifier
that
can
bring
in
the
trust
that
has
way
today
already
very
often
visibility
into
the
production
facilities.
Just
think
about
an
iso
9000
certification,
no
company
would
just
say:
oh,
I
am
compliant.
No,
it's
typically
a
certified
saying
yeah.
C
C
So,
with
this
kind
of
model
and
the
technology
approach
using
verifiable
credentials,
we
have
now
this
kind
of
scheme.
So,
let's
assume
a
consumer
who
wants
to
know
on
the
product
carbon
footprint
coming
out
of
a
production
of
a
manufacturer.
So
there's
a
request
coming
in,
and
maybe
I
use
the
error,
so
you
can
see
there's
a
request
coming
in
the
manufacturer
says.
Well,
I
cannot
really
say
anything
about
the
product
carbon
footprint
of
my
product
without
asking
my
supplier,
because
I
have
some
components.
C
Yes,
I
know
my
own
kind
of
scope,
one
two,
but
I
don't
know
the
product
carbon
footprint
of
the
components,
so
the
supplier,
t1
supplier,
has
exactly
the
same
situation,
he's
also
a
manufacturer
of
course,
and
he
would
ask-
or
she
would
ask
likewise
the
next
tier
2
supplier
and
you
could
actually
go
on
and
on.
But
let's
stop
at
that
point.
C
So
here
we
have
a
certifier
that
has
visibility,
knowledge
about
the
production
context.
What
goes
into
the
the
this
tier
tier
two
component
and
the
certified
can
issue
a
credential,
so
a
digital,
verifiable
credential
to
the
supplier.
So
the
certifier
is
in
the
role
of
the
issuer
of
a
verifiable
credential.
C
C
So
here
you
see,
we
have
exactly
these
three
rows
so
that
the
tier
one
supplier
is
in
this
first
step,
the
verifier
and
it's
possible
to
verify
yeah.
It's
actually.
I,
I
trust
the
certifier
too.
So
I
trust
whatever
is
presented
here
without
knowing
any
particular
details
about
the
production
process,
and
then
we
can
go
the
next
step
again.
C
C
You
have
ways
of
using
zero
knowledge
here
ways
of
hiding
the
identity,
so
you
could
have
actually
certain
suppliers
that
proactively
would
present
something
to
the
end
customer
to
give
additional
information
to
actually
make
the
picture
even
more
complete
and
doing
this
in
a
privacy
preserving
way,
because
you
would
not
reveal
the
identity
as
a
supplier,
and
you
would
not
reveal
any
information
about
the
exact
components
just
about
certain
aspects.
That
would
be
important
for
the
end
customer.
C
A
C
The
technology
side
that
we
believe
could
could
help
a
lot
in
this
problem
statement
that
we
have
here
underlying
these
three
roles.
It's
a
peer-to-peer
exchange
so
don't
mix
it
up
with
a
shared
distributed,
ledger
that
that,
where
all
the
pcs
are
stored,
so
we
don't
have
this
kind
of
approach.
Here
we
have
a
peer-to-peer
exchange
of
verifiable
credentials
and
verifiable
presentations
underlying
is,
of
course,
an
infrastructure
based
on
a
decentralized
implementation.
Typically,
that
helps
to
share
the
public.
C
E
So
these
are
the
device
elements,
the
main
pillars
of
that
network.
Furthermore,
looking
into
the
future,
we
are
also
envisioned
to
have
carbon
things,
for
example,
also
in
that
network,
using
the
same
trust
mechanism
using
the
same
certifiers
as
trust
anchors
to
to
verify
and
certify
the
ability
to
to
compensate
for
residual
emissions
in
trusted
carbon
things.
So
this
is
the
estenion
network,
the
stadium
network,
and
that's
very
important
to
mention,
is
something
that
must
be
independent
of
siemens.
E
How
do
we
define
the
system
boundaries
that
were
considered,
for
example,
and
how
do
we
facilitate
the
rules
by
which
we
play
in
that
network?
So
this
is
the
network.
This
is
the
siemens
indep
independent
of
siemens
cross
company
and
also
across
industrial
network
that
we
initiated-
and
this
network
of
course
offers
business
opportunities,
especially
in
the
ecosystem
that
we
want
to
grow
around
that
network
and
one
of
the
examples
how
companies
participating
in
that
network
could
monetize
on
the
network
is
given
on
the
right
hand,
side
of
the
slide.
E
E
E
What
we
brought
to
you
today,
as
well,
is
a
little
sneak
peek
in
in
form
of
a
video
that
gives
you
a
little
bit
of
a
flavor.
How
working
with
those
systems
could
look
like
and
again
the
siemens
solution
shown
here
is
just
one
of
the
examples
that
that
we
can
imagine
working
and
integrating
with
this
product
comfort
exchange
network
is
staying
new.
So
what
we
see
here
is
we
log
in
to
the
siemens
interface.
E
E
E
So,
in
that
supplier
view
now
the
suppliers
guided
through
a
structure
process
which
will
ask
all
the
questions
necessary
to
gather
that
information
system
boundaries,
data
sources
and
thereby
ensures
the
comparability
of
the
information
provided.
So
you
see
here
a
lot
of
information
requested
that
is,
that
is
given
in
a
structured
processes.
E
Also,
the
supplier
is
able
to
see
the
development
of
its
product
calm
footprints
over
time
and
also
it
it
gives
the
recipient,
as
well
as
the
sender,
the
information
about
okay,
the
data
quality,
so
quality
of
the
data
sources,
detail
level
of
detail
for
the
system,
boundaries
considered
and
so
on,
and
so
on.
Switching
back
to
the
requesters
interface.
E
What
the
switch
of
suppliers
may
make
or
result
to
in
terms
of
beneficial
impacts
on
your
products,
come
forward,
and
then,
last
but
not
least
after
you
did
everything
to
reduce
your
product,
calm
footprints.
There
will
be
residual
values,
and
here
the
the
software
may
also
offer
you
opportunities
to
compensate
for
that
emissions.
I'm
also
all
connected
to
the
system
that
we
saw,
so
you
can
compensate
for
that
information
and
based
on
on
that
info,
compensated
values.
Combined
with
the
info.
You
got
from
your
suppliers,
you're.
E
So
this
is
a
picture
of
how
we
envision
the
look
and
feel
of
these
solutions
to
be
like.
We
are
currently
in
the
process
of
developing
that
solution,
based
on
based
on
the
stadium
standards
and
now
step
back
from
the
example
of
of
a
product
back
to
to
the
stadium,
the
network,
the
ecosystem
and
the
exchanging
the
non-siemens
part
of
that
thing.
So
florian,
if
you
could
switch
to
the
next
slide
exactly
so
after
you
now
got
an
intro
and
how
this
look
like.
We
invite
other
thought.
E
We
start
with
our
product
carbon
footprints
as
probably
the
most
prominent,
if
not
most
pressing
issue
in
this
regard,
but
we
have
in
mind
that
once
that
that
ecosystem
developed
and
once
that
exchange
understood
the
test
of
time,
you're
able
to
scale
that
solution
also
to
further
environmental,
social
governmental
topics,
which
you
see
on
the
right
hand,
side
for
example,
that
you
you
deal
with
the
topic
of
conflict
minerals.
In
this
regard,
you
gain
transparency
on
circular
material
flows
and
thereby
end
up
with
a
holistic,
esg
monitoring
and
management
system.
B
B
E
Yeah,
maybe
maybe
I
take
the
question
and
andreas
and
florian-
please
please
adapt
to
this,
so
we
are
currently
in
the
process
of
setting
this
up.
So
we
are
very,
very
specifically
talking
to
other
industrial
companies,
and
this
goes
way
beyond
the
industries
that
siemens
is
is
active
in.
So
we,
for
example,
also
include
food
and
beverage
and
others.
E
He
found
that
a
stain
and
the
sustaining
association
with
us,
which,
as
I
said,
will
be
the
governing
body,
but
this
association
is
also
open
to
to
academia.
So
we
are
talking
to
universities,
and
we
also,
of
course,
given
the
important
role
that
they
would
play
in
that
the
trust
mechanism
and
the
the
overall
exchange
of
trustworthy
data.
E
We
also
talked
to
to
a
whole
bunch
of
certifiers
and,
of
course,
certifiers
see
see
also
their
business
potential
there,
because
the
information,
the
transparency
and
the
efficiency
of
these
processes
also
allow
them
to
improve
their
processes
of
certifying
and
verifying
a
product
come
from
prince.
So
this
is
a
really
open
invitation
to
to
industry
manufacturing
industry,
as
well
as
also
wholesalers,
retailers
and
others.
E
D
If
it
comes
to
methodology
and
development
in
terms
of
what
should
be
part
of
product
carbon
footprint,
which
should
be
eligible
and
for
sharing,
we
of
course
not
defining
this
all
ourselves.
We
are
in
several
working
groups
on
of
different
organizations,
have
it
be
a
world
economic
forum
or
alliances
in
the
automotive
industry?
C
C
A
Hello
andres:
this
is
maria.
Thank
you
for
that
reply.
No,
but
I
was
not
the
credentials
per
se,
not
the
credential
infrastructure,
but
the
tributes
that
you
define
in
the
credentials
is
that
following
any
industry,
guideline
of
format
or
or
or
could
each
does,
each
certifier
just
create
their
own
and
define
which
attributes
they
want
to
share
or
is
the
standard
being
used
of
which
attributes
should
be
shared.
D
D
E
E
I
think
I
can
I
can
answer
that
question
faster.
We
have
enough
time
to
answer
the
others
as
well.
Yes,
but
that's
a
a
future
state.
We
are
currently
already
talking
to
providers
of
these
compensation
opportunities,
but
this
is
further
down
the
road,
because
we
are
convinced
that,
firstly,
the
transparency,
the
trust
and
information,
and
as
soon
as
you
have
that
this
is
the
time
where
you
then
connect
also
carbon
sinks.
C
E
B
Johannes,
do
you
want
to
ask
your
question?
Maybe
I'm
supposed
to
specify
more?
What
do
you
I
mean
with
tokenization
yeah?
I
mean,
for
example,
if
you
tokenize
or
use
blockchain.
Of
course,
the
tokenization
application
is
very
important
and
if
you
tokenize
start
tokenizing
carbon
credits,
for
example,
you
could
incentivize
certain
behaviors
in
your
purchasing
and
yeah.
C
I
know
for
certain
applications
when
you
look
at
energy,
for
instance,
it
might
fit
much
better
to
think
of
tokens
where
you
have
something
like
utility
token
and
you,
you
assume,
basically
a
closed
system,
and
you
know
the
total
number
of
tokens
also
in
the
ets
schemes.
It
might
might
well
make
a
lot
of
sense
to
to
go
into
this
direction,
but
I
think
in
our
so
just
looking
at
the
problem
statement
of
sharing
product
carbon
footprint
in
a
trustworthy
manner.
C
B
C
B
C
B
A
Sorry,
I
I
raised
the
hand,
and
then
I
decided
to
type
it
in
the
chat
and
just
forgot
to
lower
my
hand,
but
since
I'm
speaking
now,
I
may
as
well
just
ask
it.
I
was
just
wondering
you
in
the
demo
that
you
showed
us
of
the
actual
software
of
the
platform
like
green,
red
or
green
connect.
Whatever
at
one
point
in
time,
you
said
you
can
like
a
supplier
can
also
get
an
idea
of
what
the
carbon
footprint
would
look
like
if
they
were
to
switch
to
another
supplier.
A
E
Very
very
valid
point
very
important
point
indeed,
especially
given
the
huge
leverage
that
the
supply
chain
has
on
your
over
protocol
footprints
and
given,
given
my
background
in
procurement.
I
can
totally
relate
to
to
you
raising
that
risk,
because
it's
it's
indeed
important
and
the
way
we
mitigate.
That
is
that
we
not
only
ask
for
the
pure
values,
but
also
for
additional
information.
What
we
call
metadata,
which
is
about
okay,
what
was
considered
what
wasn't
considered
so
it
would
be
a
bigger
effort
to
to
fake
numbers.
E
E
So,
by
doing
that,
you
bring
in
the
certifiers
and
the
certifier
would
go
to
the
supplier
and
check
for
the
accuracy
of
of
that
figures.
So
there
are
different
levels
depending
on
on
the
criticality
of
the
components,
and
you
will
always
have
the
product
carbon
footprint
in
co2
equivalence.
You
will
see
how
much
of
it
was
compensated.
B
Okay,
so
the
last
question
we
always
want
to
ask
the
people
presenting
to
our
group
is:
how
might
we
work
together?
It's
the
question.
She
would
ask
what
kind
of
project
should
the
sikh
consider
and
that
would
work
to
solving
critical
intelligence
you
foresee
so
the
first
is:
how
can
we
work
together
and
where
do
you
see
the
role
of
the
climate
seek
in
the
area
of
your
solution?.
C
Yeah
on
the
on
the
first
part
of
the
question,
of
course,
we've
very
open
to
discuss
this
approach.
We
we
need
actually
technical
access,
experts,
people
that
understand
the
the
area,
the
the
the
actual
challenge
in
in
defining
standards,
so
de
facto
standards
industry
standards,
not
necessarily
full
official
standards,
but
have
an
agreement,
basically
how
to
calculate
how
to
compare
values
and
what
is
the
mechanism
to
exchange
information
about
product
carbon
related
carbon,
related
information
of
products,
and
for
this?
C
It's
really
also,
this
presentation
is,
is
like
a
call
to
everybody
to
to
please
come
in
contact
with
us.
Maybe
we
come
into
a
community
like
this
and
and
and
discuss
more
in
this.
We
need
people
to
look
at
these.
These
approaches
the
technical
ideas
that
we
have
give
us
feedback
join
in,
be
part
of
the
association
or
whatever
do
it
in
a
community
way
or
peer-to-peer
whatever
it
is,
so
we're
very
open,
and
we
know
we
cannot
solve
it
alone.
B
Thanks
andreas
we're
looking
forward
to
collaborating
with
you
and
you
would
be
honored
if
you
will
join
one
of
our
future
meetings
and
thanks
again
for
your
time
and
your
great
presentation,
you
mastered
the
q,
a
you're
all
based
in
germany,
I
guess
or
enjoy
the
evening
and
also
to
everyone.
Let's
talk
soon
and
stay
healthy.