No content

H o w D o I E v e n S m a r t C o n t r a c t s ? L a r s H u p e l I N N O Q T e c h n o l o g y N i g h t 2 0 1 9 - 1 0 - 1 5 

E t h e r e u m • e i n e d e r j ü n g e r e n B l o c k c h a i n s • W ä h r u n g : E t h e r ( E T H ) • P l a t z 2 – 3 i n M a r k t k a p i t a l i s i e r u n g • t e c h n i s c h e N e u e r u n g : P l a t t f o r m f ü r D e c e n t r a l i z e d A p p s 

D e c e n t r a l i z e d A p p s 

E t h e r e u m Z w e i A r t e n v o n A c c o u n t s : 1 . E x t e r n a l l y O w n e d ( n a t ü r l i c h e P e r s o n ) 2 . S m a r t C o n t r a c t s ( j u r i s t i s c h e P e r s o n ) 

S m a r t C o n t r a c t s 

S m a r t C o n t r a c t s . . . s i n d s p e z i e l l e A c c o u n t s m i t e i g e n e r I d e n t i t ä t u n d K o n t o s t a n d 

S m a r t C o n t r a c t s . . . s i n d s p e z i e l l e A c c o u n t s m i t e i g e n e r I d e n t i t ä t u n d K o n t o s t a n d . . . h a b e n k e i n e O w n e r s h i p 

S m a r t C o n t r a c t s . . . s i n d s p e z i e l l e A c c o u n t s m i t e i g e n e r I d e n t i t ä t u n d K o n t o s t a n d . . . h a b e n k e i n e O w n e r s h i p . . . e n t h a l t e n S p e i c h e r z e l l e n m i t v e r ä n d e r l i c h e n W e r t e n 

S m a r t C o n t r a c t s . . . s i n d s p e z i e l l e A c c o u n t s m i t e i g e n e r I d e n t i t ä t u n d K o n t o s t a n d . . . h a b e n k e i n e O w n e r s h i p . . . e n t h a l t e n S p e i c h e r z e l l e n m i t v e r ä n d e r l i c h e n W e r t e n . . . b e s t e h e n a u s u n v e r ä n d e r l i c h e m C o d e 

S m a r t C o n t r a c t s . . . s i n d s p e z i e l l e A c c o u n t s m i t e i g e n e r I d e n t i t ä t u n d K o n t o s t a n d . . . h a b e n k e i n e O w n e r s h i p . . . e n t h a l t e n S p e i c h e r z e l l e n m i t v e r ä n d e r l i c h e n W e r t e n . . . b e s t e h e n a u s u n v e r ä n d e r l i c h e m C o d e . . . k ö n n e n m i t a n d e r e n C o n t r a c t s i n t e r a g i e r e n , w e r d e n a b e r n i e s e l b s t s t ä n d i g a k t i v 

V e r g l e i c h : d i g i t a l e r N o t a r • R e c h t e u n d P f l i c h t e n v e r t r a g l i c h f e s t g e l e g t • n e u t r a l e I n s t a n z ü b e r w a c h t A b l a u f • I n t e r a k t i o n m i t d r i t t e n P a r t e i e n 

No content

E t h e r e u m V i r t u a l M a c h i n e 

V i r t u e l l e M a s c h i n e n s i n d M i s c h f o r m e n z w i s c h e n I n t e r p r e t e r u n d C o m p i l e r 

W a s k a n n d i e E V M ? 1 . a r i t h m e t i s c h e O p e r a t i o n e n 2 . b i t w e i s e & l o g i s c h e O p e r a t i o n e n 3 . H a s h e s ( m e i s t S H A - 3 ) 4 . U m g e b u n g s i n f o r m a t i o n ( K o n t o s t a n d , A u f r u f e r , . . . ) 5 . B l o c k i n f o r m a t i o n ( Z e i t s t e m p e l , B l o c k n u m m e r , . . . ) 6 . S t a c k - u n d S p e i c h e r o p e r a t i o n e n 7 . S p r ü n g e 8 . L o g g i n g 9 . K o n t o o p e r a t i o n e n ( E r z e u g u n g , Z a h l u n g , A u f r u f , . . . ) 

• S m a r t C o n t r a c t s w e r d e n v o n a l l e n M i n e r n a u s g e f ü h r t 

• S m a r t C o n t r a c t s w e r d e n v o n a l l e n M i n e r n a u s g e f ü h r t • B e r e c h n u n g d e r T r a n s a k t i o n s g e b ü h r a n h a n d d e r A u s f ü h r u n g s d a u e r 

• S m a r t C o n t r a c t s w e r d e n v o n a l l e n M i n e r n a u s g e f ü h r t • B e r e c h n u n g d e r T r a n s a k t i o n s g e b ü h r a n h a n d d e r A u s f ü h r u n g s d a u e r • U s e r m u s s e i n e T a n k g r ö ß e u n d e i n e n S p r i t p r e i s a n g e b e n 

• S m a r t C o n t r a c t s w e r d e n v o n a l l e n M i n e r n a u s g e f ü h r t • B e r e c h n u n g d e r T r a n s a k t i o n s g e b ü h r a n h a n d d e r A u s f ü h r u n g s d a u e r • U s e r m u s s e i n e T a n k g r ö ß e u n d e i n e n S p r i t p r e i s a n g e b e n • j e d e O p e r a t i o n h a t e i n e n d e f i n i e r t e n V e r b r a u c h 

No content

P r o g r a m m i e r u n g & T o o l s 

E i n e i n f a c h e r C o n t r a c t 608060405234801561001057600080fd5b506000808190555033600160006101000a81548173ffff ffffffffffffffffffffffffffffffffffff021916908373ffffffffffffffffffffffffffffffff ffffffff1602179055506101be806100686000396000f30060806040526004361061004c57600035 7c0100000000000000000000000000000000000000000000000000000000900463ffffffff168063 3ccfd60b146100515780638f9595d414610068575b600080fd5b34801561005d57600080fd5b5061 0066610086565b005b61007061011d565b6040518082815260200191505060405180910390f35b60 0160009054906101000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffff ffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff1614 15156100e257600080fd5b600160009054906101000a900473ffffffffffffffffffffffffffffff ffffffffff1673ffffffffffffffffffffffffffffffffffffffff16ff5b60006001600090549061 01000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffff ffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff1614151561017b5760 0080fd5b3460008082825401925050819055506000549050905600a165627a7a72305820b4d2d5a2 acfa0e197908c7c57826d35a987f64b29f8b97020a4ca96f63ce66630029 

E i n e i n f a c h e r C o n t r a c t 608060405234801561001057600080fd5b506000808190555033600160006101000a81548173ffff ffffffffffffffffffffffffffffffffffff021916908373ffffffffffffffffffffffffffffffff ffffffff1602179055506101be806100686000396000f30060806040526004361061004c57600035 7c0100000000000000000000000000000000000000000000000000000000900463ffffffff168063 3ccfd60b146100515780638f9595d414610068575b600080fd5b34801561005d57600080fd5b5061 0066610086565b005b61007061011d565b6040518082815260200191505060405180910390f35b60 0160009054906101000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffff ffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff1614 15156100e257600080fd5b600160009054906101000a900473ffffffffffffffffffffffffffffff ffffffffff1673ffffffffffffffffffffffffffffffffffffffff16ff5b60006001600090549061 01000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffff ffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff1614151561017b5760 0080fd5b3460008082825401925050819055506000549050905600a165627a7a72305820b4d2d5a2 acfa0e197908c7c57826d35a987f64b29f8b97020a4ca96f63ce66630029 

S o l i d i t y • p o p u l ä r s t e H o c h s p r a c h e f ü r E V M - B y t e c o d e • g e t y p t , o b j e k t o r i e n t i e r t • s y n t a k t i s c h a n J a v a s c r i p t a n g e l e h n t 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

pragma solidity ^0.4.22; contract Wallet { uint256 balance; address owner; constructor () public { balance = 0; owner = msg.sender; } function addfund() payable public returns (uint256) { require (msg.sender == owner); balance += msg.value; return balance; } function withdraw() public { require (msg.sender == owner); selfdestruct(owner); } } 

M e t a m a s k • B r o w s e r - P l u g i n z u r V e r w a l t u n g v o n E t h e r e u m - A d r e s s e n • k o m m u n z i e r t ü b e r R P C m i t B l o c k c h a i n - K n o t e n • i n t e g r i e r t m i t w e b 3 . j s 

No content

B e i s p i e l e 

B e i s p i e l e 

B e i s p i e l e • M u l t i - S i g n a t u r - W a l l e t s 

B e i s p i e l e • M u l t i - S i g n a t u r - W a l l e t s • E R C - 2 0 - T o k e n 

B e i s p i e l e • M u l t i - S i g n a t u r - W a l l e t s • E R C - 2 0 - T o k e n • H a n d e l s b ö r s e n 

B e i s p i e l e • M u l t i - S i g n a t u r - W a l l e t s • E R C - 2 0 - T o k e n • H a n d e l s b ö r s e n • W e t t e n 

B e i s p i e l e • M u l t i - S i g n a t u r - W a l l e t s • E R C - 2 0 - T o k e n • H a n d e l s b ö r s e n • W e t t e n • C r y p t o k i t t i e s 

K o m p o n e n t e n e i n e r D a p p • W e b a p p l i k a t i o n m i t J S ( m e i s t o p e n s o u r c e ) • S m a r t C o n t r a c t ( s ) • B l o c k c h a i n 

S o f t w a r e q u a l i t ä t 

E n t w i c k l u n g s - W o r k f l o w 

E n t w i c k l u n g s - W o r k f l o w 1 . C o n t r a c t i n S o l i d i t y e n t w i c k e l n 

E n t w i c k l u n g s - W o r k f l o w 1 . C o n t r a c t i n S o l i d i t y e n t w i c k e l n 2 . m i t R e m i x / M e t a m a s k a u s r o l l e n 

E n t w i c k l u n g s - W o r k f l o w 1 . C o n t r a c t i n S o l i d i t y e n t w i c k e l n 2 . m i t R e m i x / M e t a m a s k a u s r o l l e n 3 . ? ? ? 

• S m a r t C o n t r a c t s s i n d u n v e r ä n d e r l i c h 

• S m a r t C o n t r a c t s s i n d u n v e r ä n d e r l i c h • T r a n s a k t i o n e n s i n d e n d g ü l t i g 

• S m a r t C o n t r a c t s s i n d u n v e r ä n d e r l i c h • T r a n s a k t i o n e n s i n d e n d g ü l t i g • e s g i b t k e i n e K o n t r o l l i n s t a n z * 

• S m a r t C o n t r a c t s s i n d u n v e r ä n d e r l i c h • T r a n s a k t i o n e n s i n d e n d g ü l t i g • e s g i b t k e i n e K o n t r o l l i n s t a n z * • F e h l e r s i n d n i c h t k o r r i g i e r b a r * 

F a t a l e F e h l e r T h e D A O ( 2 0 1 6 ) • D e c e n t r a l i z e d A u t o n o m o u s O r g a n i z a t i o n • e i n e A r t d i g i t a l e r G e b e r v o n W a g n i s k a p i t a l • I d e e : I n v e s t o r * i n n e n s t i m m e n ü b e r K a p i t a l n u t z u n g a b • B u g i m C o n t r a c t f ü h r t e z u m A b g r e i f e n v o n 5 0 M i l l i o n e n U S D 

F a t a l e F e h l e r P a r i t y W a l l e t ( 2 0 1 7 ) • O n l i n e W a l l e t f ü r E t h e r u n d a n d e r e T o k e n • B u g i m C o n t r a c t f ü h r t e z u m A b g r e i f e n v o n 3 0 M i l l i o n e n U S D 

F a t a l e F e h l e r P a r i t y W a l l e t ( 2 0 1 7 ) • O n l i n e W a l l e t f ü r E t h e r u n d a n d e r e T o k e n • B u g i m C o n t r a c t f ü h r t e z u m A b g r e i f e n v o n 3 0 M i l l i o n e n U S D • w e i t e r e r B u g f ü h r t e z u m T o t a l v e r l u s t v o n 3 6 0 M i l l i o n e n U S D 

Q u a l i t ä t s s i c h e r u n g T r u f f l e : F r a m e w o r k f ü r d e n g e s a m t e n E n t w i c k l u n g s z y k l u s • T e s t i n g ( S o l i d i t y u n d J a v a S c r i p t ) • D e p l o y m e n t • M i g r a t i o n s 

C o d e i s L a w “ H o w e v e r , t h e s e m o r e c o m p l e x a g r e e m e n t s , w i t h g r e a t e r e n g a g e m e n t w i t h r e a l w o r l d g o o d s a n d s e r v i c e s , h i g h l i g h t t h e n e c e s s i t y o f e f f e c t i v e d i s p u t e r e s o l u t i o n , a s w e l l a s i n d i c a t e a n e c e s s a r y i n t e r r e l a t i o n w i t h t e r r i t o r i a l l e g a l s y s t e m s . 

C o d e i s L a w “ H o w e v e r , t h e s e m o r e c o m p l e x a g r e e m e n t s , w i t h g r e a t e r e n g a g e m e n t w i t h r e a l w o r l d g o o d s a n d s e r v i c e s , h i g h l i g h t t h e n e c e s s i t y o f e f f e c t i v e d i s p u t e r e s o l u t i o n , a s w e l l a s i n d i c a t e a n e c e s s a r y i n t e r r e l a t i o n w i t h t e r r i t o r i a l l e g a l s y s t e m s . C o n t e s t a t i o n m e c h a n i s m s a r e n e c e s s a r y t o ‘ s o f t e n ’ t h e e f f e c t s o f s e l f - e x e c u t i n g ‘ s m a r t c o n t r a c t s ’, a n d m a k e t r a n s a c t i o n s r e v e r s i b l e , a l l o w - i n g t h e o u t c o m e s o f d i s p u t e r e s o l u t i o n t o b e e n f o r c e d . ” G o l d e n f e i n & L a t e r : “ L e g a l E n g i n e e r i n g o n t h e B l o c k c h a i n : ‘ S m a r t C o n t r a c t s ’ a s L e g a l C o n d u c t ” ( 2 0 1 8 ) 

H ü r d e n f ü r S m a r t C o n t r a c t s • b i s h e r k e i n e e t a b l i e r t e n f o r m a l e n M e t h o d e n • u n k l a r e J u r i s d i k t i o n • N a c h v o l l z i e h b a r k e i t d e s C o d e s 

S m a r t C o n t r a c t s ? “ T h e r e a r e o n l y t w o t h i n g s y o u n e e d t o k n o w a b o u t s m a r t c o n t r a c t s : 1 . T h e y ’ r e n o t s m a r t . 2 . T h e y ’ r e n o t c o n t r a c t s . ” P h i l i p W a d l e r ( a t F u l l S t a c k F e s t : https://twitter.com/steveklabnik/status/1169599735956672513) 

R u s t & W e b A s s e m b l y 

R u s t & W e b A s s e m b l y R u s t • m a s c h i n e n n a h e S p r a c h e v o n M o z i l l a • F o k u s a u f S p e i c h e r s i c h e r h e i t • k e i n G C � W e b A s s e m b l y • A s s e m b l e r s p r a c h e f ü r d e n B r o w s e r • l ä u f t i n d e r J S - S a n d b o x • k e i n Z u g r i f f a u f d e n D O M 

E W A S M • W e b A s s e m b l y a u f d e r E V M : v i e l v e r s p r e c h e n d e E n t w i c k l u n g • d e r z e i t n o c h u n s p e z i f i z i e r t • e x p e r i m e n t e l l e I m p l e m e n t i e r u n g i n P a r i t y 

F a z i t 

F a z i t • E t h e r e u m i s t b i s h e r g r ö ß t e P l a t t f o r m f ü r D a p p s • h o h e E n t w i c k l u n g s g e s c h w i n d i g k e i t • l e i d e t a n m a n g e l h a f t e m S p r a c h d e s i g n • P r o o f o f A u t h o r i t y u n d E W A S M v i e l v e r s p r e c h e n d , a b e r n o c h i n d e n K i n d e r s c h u h e n 

Q & A L a r s H u p e l � l a r s . h u p e l @ i n n o q . c o m � @ l a r s r _ h w w w . i n n o q . c o m i n n o Q D e u t s c h l a n d G m b H K r i s c h e r s t r . 1 0 0 4 0 7 8 9 M o n h e i m a . R h . G e r m a n y + 4 9 2 1 7 3 3 3 6 6 - 0 O h l a u e r S t r . 4 3 1 0 9 9 9 B e r l i n G e r m a n y L u d w i g s t r . 1 8 0 E 6 3 0 6 7 O f f e n b a c h G e r m a n y K r e u z s t r . 1 6 8 0 3 3 1 M ü n c h e n G e r m a n y c / o W e W o r k H e r m a n n s t r a s s e 1 3 2 0 0 9 5 H a m b u r g G e r m a n y i n n o Q S c h w e i z G m b H G e w e r b e s t r . 1 1 C H - 6 3 3 0 C h a m S w i t z e r l a n d + 4 1 4 1 7 4 3 0 1 1 1 A l b u l a s t r . 5 5 8 0 4 8 Z ü r i c h S w i t z e r l a n d 

L A R S H U P E L C o n s u l t a n t i n n o Q D e u t s c h l a n d G m b H L a r s e n j o y s p r o g r a m m i n g i n a v a r i e t y o f l a n - g u a g e s , i n c l u d i n g S c a l a , H a s k e l l , a n d R u s t . H e i s k n o w n a s a f r e q u e n t c o n f e r e n c e s p e a k e r a n d o n e o f t h e f o u n d e r s o f t h e T y p e l e v e l i n i t i a t i v e w h i c h i s d e d i c a t e d t o p r o v i d i n g p r i n c i p l e d , t y p e - d r i v e n S c a l a l i b r a r i e s . 

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