Bitcoin AMiens

"Script : le language de programmation de bitcoin"

Amiens, France

Lola

"Script est un simple langage à pile qui se lit de gauche à droite. Il est intentionnellement non-Turing complet et ne comporte pas de boucle."

https://en.bitcoin.it/wiki/Script

Tant que (condition) {
    instruction 1
    instruction 2
    instruction 3
    ...
}

Une boucle.

Programmation à pile.

Une Transaction Bitcoin

Input:
Previous tx: f5d8ee39a430901c91a5917b9f2dc19d6d1a0e9cea205b009ca73dd04470b9a6
Index: 0
scriptSig: 304502206e21798a42fae0e854281abd38bacd1aeed3ee3738d9e1446618c4571d10
90db022100e2ac980643b0b82c0e88ffdfec6b64e3e6ba35e7ba5fdd7d5d6cc8d25c6b241501

Output:
Value: 5000000000
scriptPubKey: OP_DUP OP_HASH160 404371705fa9bd789a2fcd52d2c580b65d35549d
OP_EQUALVERIFY OP_CHECKSIG

script condition :
OP_DUP OP_HASH160 404371705fa9bd789a2fcd52d2c580b65d35549d
OP_EQUALVERIFY OP_CHECKSIG

Script solution :
304502206e21798a42fae0e854281abd38bacd1aeed3ee3738d9e1446618c4571d10
90db022100e2ac980643b0b82c0e88ffdfec6b64e3e6ba35e7ba5fdd7d5d6cc8d25c6b241501

Condition qui nous permet de dépenser nos bitcoins

opcodes

scriptPubKey:
OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG

scriptSig:
<sig> <pubKey>

OPCODE	DESCRIPTION
OP_DUP	Prend le premier élément de la pile et le copie
OP_HASH160	Hash le premier élément de la pile
OP_EQUALVERIFY	Vérifie que les deux permiers éléments de la pile sont égaux
OP_CHECKSIG	Vérifie la signature

<sig>

<pubKey>

OP_DUP

OP_HASH160

<pubKeyHash>

OP_EQUALVERIFY

OP_CHECKSIG




* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *


<pubKey>

OP_DUP

OP_HASH160

<pubKeyHash>

OP_EQUALVERIFY

OP_CHECKSIG




* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                    <sig>                      |
|                                               |
* --------------------------------------------- *


OP_DUP

OP_HASH160

<pubKeyHash>

OP_EQUALVERIFY

OP_CHECKSIG




* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                   <pubKey>                    |
|                                               |
* --------------------------------------------- *
|                                               |
|                    <sig>                      |
|                                               |
* --------------------------------------------- *



OP_HASH160

<pubKeyHash>

OP_EQUALVERIFY

OP_CHECKSIG


                     OP_DUP

* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                   <pubKey>                    |
|                                               |
* --------------------------------------------- *
|                                               |
|                   <pubKey>                    |
|                                               |
* --------------------------------------------- *
|                                               |
|                    <sig>                      |
|                                               |
* --------------------------------------------- *





<pubKeyHash>

OP_EQUALVERIFY

OP_CHECKSIG


                  OP_HASH160

* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                 <pubKeyHash>                  |
|                                               |
* --------------------------------------------- *
|                                               |
|                   <pubKey>                    |
|                                               |
* --------------------------------------------- *
|                                               |
|                    <sig>                      |
|                                               |
* --------------------------------------------- *






OP_EQUALVERIFY

OP_CHECKSIG


                  

* --------------------------------------------- *
|                                               |
|                 <pubKeyHash>                  |
|                                               |
* --------------------------------------------- *
|                                               |
|                 <pubKeyHash>                  |
|                                               |
* --------------------------------------------- *
|                                               |
|                   <pubKey>                    |
|                                               |
* --------------------------------------------- *
|                                               |
|                    <sig>                      |
|                                               |
* --------------------------------------------- *






OP_CHECKSIG


                 OP_EQUALVERIFY

* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                   <pubKey>                    |
|                                               |
* --------------------------------------------- *
|                                               |
|                    <sig>                      |
|                                               |
* --------------------------------------------- *


                   OP_CHECKSIG

* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                                               |
|                                               |
* --------------------------------------------- *
|                                               |
|                     TRUE                      |
|                                               |
* --------------------------------------------- *

pay-to-pubkey-hash

scriptPubKey:
OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG

scriptSig:
<sig> <pubKey>

Anyone-Can-Spend

scriptPubKey:
(empty)

scriptSig:
OP_TRUE

LOCKTIME SCRIPT

scriptPubKey:
<expiry time> OP_CHECKLOCKTIMEVERIFY OP_DROP OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG

scriptSig:
<sig> <pubKey>

pay-to-pubkey (obsolete)

scriptPubKey:
<pubKey> OP_CHECKSIG

scriptSig:
<sig>

SCript PUZZLE

scriptPubKey:
OP_HASH256 6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000 OP_EQUAL

Double hash du genesis block

scriptPubKey:
OP_2DUP OP_EQUAL OP_NOT OP_VERIFY OP_SHA1 OP_SWAP OP_SHA1 OP_EQUAL

Colision sha1 (trouvé par google en 2017)

Conclusion

Bitcoin a un langage de programmation.

Bitcoin Amiens

Meetup Bitcoin à Amiens :

http://www.meetup.com/Bitcoin-Amiens-Meetup/

Discord :

https://discord.gg/dKE57Aq

Twitter :

@BitcoinAmiens

BItcoin Amiens : Script

By Lola Rigaut-Luczak