s b t-e t he r eu m > a terminal for the world computer s teve r - PowerPoint PPT Presentation

s b t-e t he r eu m > a terminal for the world computer s teve r andy w aldman — s waldma n@m change .c om — h ttps ://w ww .s bt -e thereu m.i o / — h ttps ://w ww .i nterfm u idity .c om / — @i nterfm u idity

t h e b lo c kc h ai n i s t h e d Ap p R emembe r t his ? ...The Times 03/Jan/2009 Chancellor on brink of second bailout for banks...

m e an w hi l e... 4 W e 'v e i nterna l ized t h e i nfanti l izing n orms of c ontemp o rary S ilicon V alley . 4 J ust wa i t f o r "u s " (t he "d evs !", t h e "t eam !", "V Cs !") to b uild y o u ("e nd u sers !") s omethi n g c omplic a ted a n d a wesome !

m e an w hi l e... 4 I t 's g onna ta k e a l o t of ti m e a n d m oney , b ecause "e nd u sers !" ne e d an a wesome "U X !" 4 E very e xperim e nt r equire s a f u nded s tartup a n d s cale s uffj c ient to j ustify t hat 4 S o we r u n te n s of b ig , e xpensi v e e xperim e nts r ather th a n t housan d s of s mall , c heap o nes

t h e b lo c kc h ai n i s t h e d Ap p B ut ... 4 E thereu m s mart c ontrac t s e xpose a UI a utomat i cally 4 I t 's c alled an A BI 4 S mart c ontrac t s ta k e an o rder of m agnitu d e le s s e fg o rt to w rite th a n t h e W eb , m obile , a n d UX s tufg in w hich p eople s urroun d t hem 4 W e s hould p refer a w orld wi t h ma n y s mall -s cale e conomi c a rrange m ents to o n e wi t h a f ew , s tandar d l arge -s cale o nes

t h e b lo c kc h ai n i s t h e d Ap p 4 S ophist i cated "e nd u sers " c a n d eploy a n d i nterac t wi t h s mart c ontrac t s d irectl y, a n d ta k e fu l l c ontrol 4 L ess s ophist i cated u sers c a n re l y up o n h umans wh o m th e y d irectl y kn o w as h elpers a n d i nterme d iaries 4 E ventua l ly , i nterme d iary r oles c a n be s moothe d a n d a utomat e d a way . B u t t hat 's e ventua l ly .

s b t-e t he r eu m 4 A c onveni e nt , h igh -l evel , t ext -b ased us e r i nterfa c e f o r i nterac t ing wi t h E thereu m a n d c ompati b le b lockch a ins 4 A s mart -c ontrac t d evelop m ent a n d d eploym e nt t ool 4 A h igh -p erform a nce f ramewo r k f o r i ntegra t ing s mart c ontrac t s in t o S cala a pplica t ions 4 A p latfor m f o r d evelop i ng a pp -s pecifj c C LIs

v e ry s ta t ef u l s bt -e thereu m c ollect s a n d r etains ... 4 N ode U RLs 4 W allets , a ddress e s , a n d a ddress a liases 4 A BIs a n d A B I a liases 4 D efault m apping s of AB I s to s mart c ontrac t s 4 C omplet e c ompila t ion in f o a bout d eploye d c ontrac t s

f r ie n dl y (s o rt o f) 4 T ab -c omplet e y 4 O ften i nterac t ive 4 V ery lo n g b u t d escrip t ive n ames 4 C onsist e nt i nterna l c onvent i ons 4 D efault v alues a n d s ession o verrid e s 4 S et , D rop , P rint

f r ie n dl y (s o rt o f) G et s tarted wi t h a f e w b asic c ommand s > ethContractAbiImport <address-as-hex-alias-or-ens> > ethTransactionView <address-as-hex-alias-or-ens> <function-args>* > ethTransactionInvoke <address-as-hex-alias-or-ens> <function-args>* > ethTransactionEtherSend <address-as-hex-alias-or-ens> > ethAddressBalance [optional-address-as-hex-alias-or-ens] > ethAddressAliasSet <alias-name> <address-as-hex-alias-or-ens>

b a tt e ri e s i nc l ud e d E NS 4 E NS c a n be us e d in p lace of a ddress e s a n d a ddress a liases 4 A cts as a f ull E N S c lient , i ncludi n g r egiste r ing n ames , e xtendi n g r egistr a tions , c reatin g s ubnode s, t ransfe r ing o wnersh i p , e tc .

b a tt e ri e s i nc l ud e d E RC -2 0 4 B uilt in s upport f o r m anagin g E RC -2 0 t okens u sing h uman -f riendl y v alues as d efj n ed in t h e decimals() f unctio n E thersc a n 4 A utoimp o rt AB I s of v erifj e d c ontrac t s if an E thersc a n A P I k e y h a s b e e s et .

p o we r fu l 4 F ull s mart -c ontrac t d evelop m ent e nviron m ent 4 S upport s s igning f o r E IP -1 55 c hain I D s a n d s eamles s s witchi n g b etween c hains 4 O ffm i ne t ransac t ion -s igning f o r co l d w allets 4 S ophist i cated c ontrol of g a s a n d n onces 4 N ame a n d s tore r eusabl e A BIs 4 O verlay a rbitra r y AB I s on t o p of a n y c ontrac t

p r og r am m in g (S c al a -c e nt r ic) 4 A utomat i c st u b g enerat i on 4 T hread -p ool m anaged a sync s tubs or e asy -t o - u nderst a nd s ynchro n ous s tubs 4 S olidit y-l ike e mbedde d D SL 4 S olidit y e vents b ecome t ypesaf e, p attern - m atchab l e S cala o bjects 4 S tandar d "r eactiv e" fj l ter -f ree e vent s ubscri p tions

p r og r am m in g (S c al a -c e nt r ic) contract DocHashStore { event Stored( bytes32 docHash, uint timestamp, string name, string description, address filer ); event Amended( bytes32 docHash, string name, string description, address updater, uint priorUpdateBlockNumber ); event Opened( address admin, uint timestamp ); event Closed( address closer, uint timestamp ); event Authorized( address user ); event Deauthorized( address user ); address public admin; bytes32[] public docHashes; mapping ( address => bool ) public authorized; uint public openTime; uint public closeTime; bool public closed; function close() public; function authorize( address filer ) public; function deauthorize( address filer ) public; function canUpdate( address user ) public view returns (bool); function store( bytes32 docHash, string memory name, string memory description ) public; function amend( bytes32 docHash, string memory name, string memory description ) public; function isStored( bytes32 docHash ) public view returns (bool); function timestamp( bytes32 docHash ) public view returns (uint); function name( bytes32 docHash ) public view returns (string memory); function description( bytes32 docHash ) public view returns (string memory); function filer( bytes32 docHash ) public view returns (address); function size() public view returns (uint); }

p r og r am m in g (S c al a -c e nt r ic) // for simplicity, this example builds a synchronous DocStoreHash // if we called AsyncDocStoreHash.build(...) instead, the same code would work // but all stub return values would be Futures val docstore = DocHashStore.build( jsonRpcUrl = "https://mainnet.infura.com/v3/20963efa809b0178", chainId = Some(EthChainId.Mainnet), contractAddress = EthAddress("0x1a4934109b54911a724dfa0e45d5370dbbe923b0") ) implicit val sender = stub.Sender.Basic( somePrivateKey ) val sz = docstore.view.size() val docHash = sol.Bytes32( "0x00e2b1120d2c76a3b44640c325681c892dd3a1fcb33bf412169a2c17f5e0c171".decodeHex ) val txnInfo = docstore.txn.store( docHash, "ImportantDocument.pdf", "This is a really important document" )

p r og r am m in g (S c al a -c e nt r ic) // inside a standard org.reactivestreams.Subscriber[DocHashStore.Event] def onNext(evt : DocHashStore.Event) = { evt match { case _ : Stored | _ : Amended => markDirtyDocRecordSeq( address ) case _ : Closed => { markDirtyOpenClose( address ) subscriptionRef.get.foreach( _.cancel() ) drop( address ) } case evt @ Authorized( userAddress ) => markDirtyUserCanUpdate( evt.sourceAddress, userAddress ) case evt @ Deauthorized( userAddress ) => markDirtyUserCanUpdate( evt.sourceAddress, userAddress ) case _ => DEBUG.log( s"${this} encountered and ignored event ${evt}" ) } }

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s u pp o rt 4 D ecent d ocumen t ation at w ww .s bt -e thereu m.i o 4 T ag sbt-ethereum on e thereu m.s tackex c hange .c om 4 D M @interfluidity on T witter 4 E-m ail swaldman@mchange.com 4 swaldman/sbt-ethereum on G itHub

s u pp o rt m e 4 U se t h e s oftwar e 4 T ell me wh a t s ucks so I c a n fj x i t 4 e specia l ly if a nythin g s ucks r elated to s ecurit y 4 I f y o u wa n t to o fg e r fj n ancial s upport , g e t in t ouch , or c ontrib u te to sbt-ethereum.eth

a c kn o wl e dg m en t s W aiting f o r G odot i mage n icked f rom 4 h ttps ://w ww .o necolu m biasc .c om /e vent /w aiting -f or -g odot /