* ID & IT Management Conference 2016 SFC [email protected] – 2016-09-16 – p.1/15 

( ) ([email protected]) SFC ( ) CSO (Chief Science Officer) 1988∼1997 ( ) 1993 M.Eng (CS) 2006 ( ) SFC 15 P2P ⇒ – 2016-09-16 – p.2/15 

– 2016-09-16 – p.3/15 

( ) ( ) ← (TX) (TX) ← ( : ) ( ) “A timestamp server works by taking a hash of a block of items to be timestamped and widely publishing the hash, such as in a newspaper or Usenet post” “To implement a distributed timestamp server on a peer-to-peer basis, we will need to use a proof-of-work system similar to Adam Back’s Hashcash, rather than newspaper or Usenet posts” – Satoshi Nakamoto (2008) – 2016-09-16 – p.4/15 

( ) 1. 10 ( ) 2. 3. 1 – 2016-09-16 – p.5/15 

: End-to-End ( ) ( ) – 2016-09-16 – p.6/15 

– 2016-09-16 – p.7/15 

(Hyperledger ) ( ) ( ) ( ) IoT / / ( ) – 2016-09-16 – p.8/15 

: . . . : Proof of Existence ( ) : – 2016-09-16 – p.9/15 

vs. – 2016-09-16 – p.10/15 

– 2016-09-16 – p.11/15 

The DAO ( ) The DAO Split ( ) 360 ETH (50∼60 ) (6/17) ( ) ( ; ) (7/20 ) – 2016-09-16 – p.12/15 

: ⇒ – 2016-09-16 – p.13/15 

3 1. ( ) ⇒ ( ) 2. ( ) ⇒ 3. ( ) TX ⇒ – 2016-09-16 – p.14/15 

( ) ⇒ ( ) – 2016-09-16 – p.15/15