Linked Questions

0
votes
1answer
1k views

Calling External Web Service from Smart Contract [duplicate]

Trying to find a way to invoke a external web service to perform any operation based on some action on the smart contract. Request to share details as to how to perform the same.
0
votes
2answers
1k views

How can an Ethereum contract read data from excel [duplicate]

Is there a possibility to read excel from smart contract? If yes how? Do I need some relay or something.
1
vote
0answers
205 views

Can a ethereum smart contract look up the current dollar/ether exchange rate and then change its behaviour depending on it?? and how? [duplicate]

can a contract on blockchain get outside data like "current dollar/ether exchange rate" using api like call?? If yes, how can it be done? and is there any technique to control the behaviour of the ...
3
votes
1answer
195 views

What is the intended way for Ethereum contracts to interact with third party software? [duplicate]

Let us assume we have an Ethereum contract to issue software licenses. The contract creates an entry in it's local database to document the availability of the license to the purchaser. In which way ...
2
votes
0answers
149 views

Using External API in a Contract? [duplicate]

Is it possible (and feasible) to have a solidity contract connect to an external api and execute a contract based on what is found? For example betting on sports games by agreeing to a credible API ...
1
vote
0answers
48 views

Alleged solution for music copyright payment with smart contract [duplicate]

Everywhere on the internet people are blogging/bragging about how smart contract can reinforce payment to musicians/content providers (on each usage (download, listening/clicking) of the content!!), ...
46
votes
3answers
12k views

Why can't contracts make API calls?

The model that contracts can only accept and process data, instead of also being able to retrieve data from the Internet, seems limiting (even if not, it's less direct). If a concern is that data or ...
20
votes
3answers
4k views

How does Oraclize handle the TLSnotary secret?

Oraclize claims to offer a provably honest secure retrieval of a webpage by taking advantage of TLSnotary (a service that allows an auditor to verify if a specific web page was accurately retrieved) ...
17
votes
1answer
3k views

How to access external knowledge / data in a smart contract

let’s say a contract wants to execute on knowledge contained outside the blockchain (e.g. whats the price of gold, what was the avg windspeed in NYC, how many people moved to portland in the last ...
8
votes
3answers
1k views

Smart contracts and IoT: how will they call the physical world?

Ethereum and IoT: if smart contracts cannot contact the "outside world", how will they trigger car unlocks and other things with the "smart" property? An AirBnB example: a smart contract between two ...
6
votes
2answers
2k views

Smart contract based betting

Let’s say I want to enter into a bet with my friend that if it rains 10 days from now, I will pay him $100. If it doesn’t, he will pay me $100. Would it be possible to take advantage of smart ...
4
votes
1answer
783 views

Become your own Oracle? Can you put your own real world data into your Ethereum contracts? [duplicate]

I was reading this link and have a question that I don't think was answered there . I understand that the third party providers act as Oracles and they bridge the gap by putting real world info into ...
0
votes
2answers
749 views

How to access an API from a solidity smart contract?

I saw how this can be done using Oraclize. Is there any native way to access an API from a solidity smart contract? I understand there is a restriction on the solidity program to be able to call an ...
3
votes
2answers
697 views

Writing to IPFS directly from solidity contract

Does anyone know how to add a file to IPFS directly from a solidity contract?
1
vote
2answers
643 views

Smart Contracts and Insurances, how is an event determined?

I recently came across this article: https://dailyfintech.com/2016/01/14/what-does-the-future-hold-for-blockchain-and-insurance/ There they claim to have built an Flight Insurance Smart Contract ...

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