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Thought about Local facts
How do we put local facts into
blockchain ?
Tomoaki Sato
Smart Contract Japan
How to get better results about the stock price
of Japanese SME company on blockchain ?
tet
Blockchain is not good at local facts
as the google does...
tet
good at ‘googlable’ information, but often misresults about
the private information(company, real-property pricing, how
to make money ? or somethings...)
1. Add location & Language Filter
2. Deposit of fact providers
3. Ask many professionals
tet
Add location or language filter
yield more good results, but not enough
tet
Location separation
tet
fact
provider
X
Last staked point
fact
provider
X
Last staked point
Separated consensus in data level
, but value can be transferrable
Proof of location
tet
Mobile 4 G towerGPS
GPS is not enough.
We need GPRS = GPS + Cellt tower
Language separation (optional)
tet
ex) When you search Japanese company stock information,
it’s better for you to search by Japanese.
2. Deposit of fact providers
~Fact providers should have responsibility of their information~
tet
Deposit as professional fact provider
tet
sha256(PREVHASH + ADDRESS + TIMESTAMP) <= 2^256 * BALANCE / DIFFICULTY
PoS Blockchain
Fact vaildation fee
+
Proof of Stake Rewar
Local fact
provider
Local fact
provider
Deposit Deposit
Local fact
provider
Deposit
When a provider cheat,
they lose the deposit.
Cheating = vote to minority.
Losing = moves the value from minority to majority
tet
PoS Blockchain
Local fact
provider
Local fact
provider
Deposit Deposit
Minority
Local fact
provider
Majority
Local fact
provider
Deposit
Deposit
When a provider cheat,
they lose the deposit and
the value moves to
other validator in the same region
1 fact &&
1 local
3. Ask many professionals
(including prediction markets)
tet
Prediction market as a professional
tet
SellerBuyer
How much is the company’s stock price of the seller ?
(what we call oracle)
Decentralized
Prediction marketPrediction marketProfessional
Prediction market as a professional
tet
SellerBuyer
How much is my company’s stock price?
Please attach your sign to your prediction
(what we call oracle)
Decentralized
Prediction marketPrediction marketProfessional

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Localfacts smartcontractjp

  • 1. Thought about Local facts How do we put local facts into blockchain ? Tomoaki Sato Smart Contract Japan
  • 2. How to get better results about the stock price of Japanese SME company on blockchain ? tet
  • 3. Blockchain is not good at local facts as the google does... tet good at ‘googlable’ information, but often misresults about the private information(company, real-property pricing, how to make money ? or somethings...)
  • 4. 1. Add location & Language Filter 2. Deposit of fact providers 3. Ask many professionals tet
  • 5. Add location or language filter yield more good results, but not enough tet
  • 6. Location separation tet fact provider X Last staked point fact provider X Last staked point Separated consensus in data level , but value can be transferrable
  • 7. Proof of location tet Mobile 4 G towerGPS GPS is not enough. We need GPRS = GPS + Cellt tower
  • 8. Language separation (optional) tet ex) When you search Japanese company stock information, it’s better for you to search by Japanese.
  • 9. 2. Deposit of fact providers ~Fact providers should have responsibility of their information~ tet
  • 10. Deposit as professional fact provider tet sha256(PREVHASH + ADDRESS + TIMESTAMP) <= 2^256 * BALANCE / DIFFICULTY PoS Blockchain Fact vaildation fee + Proof of Stake Rewar Local fact provider Local fact provider Deposit Deposit Local fact provider Deposit When a provider cheat, they lose the deposit.
  • 11. Cheating = vote to minority. Losing = moves the value from minority to majority tet PoS Blockchain Local fact provider Local fact provider Deposit Deposit Minority Local fact provider Majority Local fact provider Deposit Deposit When a provider cheat, they lose the deposit and the value moves to other validator in the same region 1 fact && 1 local
  • 12. 3. Ask many professionals (including prediction markets) tet
  • 13. Prediction market as a professional tet SellerBuyer How much is the company’s stock price of the seller ? (what we call oracle) Decentralized Prediction marketPrediction marketProfessional
  • 14. Prediction market as a professional tet SellerBuyer How much is my company’s stock price? Please attach your sign to your prediction (what we call oracle) Decentralized Prediction marketPrediction marketProfessional