Linked Questions

2
votes
1answer
632 views

How exactly does Oraclize works under the hood? [duplicate]

The following is what the Ethereum documentation of Oraclize says: Firstly, in the most common case, a transaction executing a function of a smart contract is broadcasted by an user. The ...
0
votes
1answer
782 views

How Oraclize and API call works

I have read the Oraclize documentation: https://docs.oraclize.it/#home and similar topic like: How do oracle services work under the hood But is still have a question, take this example: I have a ...
0
votes
2answers
776 views

Is there a way to give access of an external storage mechanism only to a smart contract?

Is there a way to give access of an external storage mechanism only to a smart contract? So that only the smart contract can upload files
1
vote
2answers
1k views

Smart Contract calling an external API? [duplicate]

Is it possible for an ethereum smart contract to call an external API which then returns a list of value? Nathan Aw
0
votes
1answer
525 views

How to write oracle and put sensor data to blockchain? [closed]

I havea project in which I need to send the readings from the sensor connected to RPi to blockchain. Due to the fact that smart contract cannot manipulate data outside blockchain I need an oracle that ...
1
vote
1answer
360 views

How can I build a smart Oracle of my own for a smart contract? [closed]

I need my smart contract to access data from some source. I want to build a smart Oracle in order to achieve this.
2
votes
2answers
156 views

How to authenticate a smart contract

my Question is, how the identity of a smart contract can be verified, or basically how to authenticate a contract. As far as I know a contract does not have a private key and also cannot keep one, ...
0
votes
1answer
166 views

Private Ethereum Smart Contract API call to notify (without needing the external api response to update the state) without using Oraclize

In a Private Ethereum Smart Contract, can we do an external API call just to notify (without needing the external api response to update the state) without using Oraclize? Understand Oraclize is ...
0
votes
1answer
150 views

Some info of contract when price of something reach some level [duplicate]

I'm total newbie. Let's assume I want to create a contract that sell BTC when price reach 20.000$ for example, how can I do that? How smart contract check the price? How many times? I don't understand ...
2
votes
1answer
62 views

How do smart contracts deal with data that fluctuates?

In my limited understanding of smart contracts, I've read that every node on the Ethereum network must execute a smart contract to come to consensus. I'm guessing that not all these nodes execute the ...
1
vote
1answer
74 views

Multi node replication

In a multi node network, if one node is down (and a majority of nodes are up and running) for a period of time - say its down at block 100 block and rejoins when the network is at block 200. Q1: ...
1
vote
1answer
70 views

Smart contract - OpenWeatherMap API

I'm wanting to create a smart contract that sends an amount of ether to an address when the weather is above 30 degrees for 3 or more consecutive days, using the OpenWeatherMap API. How can I use ...
1
vote
1answer
45 views

What are normal entry / execute / exit conditions for DApps?

Very new to this space, so forgive the lack of foundation knowledge. Looked at the yellow paper, but honestly the set theory in it is a bit more than I want to bite off right now. I think I have an ...