How to create a paid keyvalue storeHow to interact with a smart contract in practice (for free)? A bigger...
Does the reader need to like the PoV character?
How can ping know if my host is down
Why do some congregations only make noise at certain occasions of Haman?
Is this part of the description of the Archfey warlock's Misty Escape feature redundant?
Plot of a tornado shape like surface
Is there a nicer/politer/more positive alternative for "negates"?
Can you use Vicious Mockery to win an argument or gain favours?
How would you translate "more" for use as an interface button?
Stack Interview Code methods made from class Node and Smart Pointers
What fields between the rationals and the reals allow a good notion of 2D distance?
What is the English pronunciation of "pain au chocolat"?
How to explain what's wrong with this application of the chain rule?
Pre-mixing cryogenic fuels and using only one fuel tank
Can I cause damage to electrical appliances by unplugging them when they are turned on?
awk assign to multiple variables at once
How to get directions in deep space?
How to create a paid keyvalue store
What does Apple's new App Store requirement mean
Why does Carol not get rid of the Kree symbol on her suit when she changes its colours?
How do you make your own symbol when Detexify fails?
What (the heck) is a Super Worm Equinox Moon?
Microchip documentation does not label CAN buss pins on micro controller pinout diagram
Is it allowed to activate the ability of multiple planeswalkers in a single turn?
How can I write humor as character trait?
How to create a paid keyvalue store
How to interact with a smart contract in practice (for free)? A bigger picture!DApp storage for data other than tranactions?Create contract that receives and sends bonus money to many addresses. What is the gas price?Are API tokens incompatible with Ethereum apps?Best practices for handling payment in smart contractsStore specific data related to usersThe better way to integrate Ethereum payments into web applicationHow can I create a modifier that requires the msg.sender be one of multiple addresses?Smart Contract To Send Multiple OutputsHow does Ethereum Smart Contract work on Mobile Client
I'd like to create a contract through which people can set publicly available key=value information in exchange for some Ether sent to me (the owner of the contract).
This is to create a public decentralized database on which anyone can read and write, and the Ether cost would be to limit spam.
However, I'd like it to be free for all users to retrieve any key stored in the contract. My understanding of Ethereum is limited, is this possible?
contract-development contract-design
asked 1 hour ago
thewonderedthewondered
161
New contributor
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'd like to create a contract through which people can set publicly available key=value information in exchange for some Ether sent to me (the owner of the contract).
This is to create a public decentralized database on which anyone can read and write, and the Ether cost would be to limit spam.
However, I'd like it to be free for all users to retrieve any key stored in the contract. My understanding of Ethereum is limited, is this possible?
contract-development contract-design
asked 1 hour ago
thewonderedthewondered
161
New contributor
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'd like to create a contract through which people can set publicly available key=value information in exchange for some Ether sent to me (the owner of the contract).
This is to create a public decentralized database on which anyone can read and write, and the Ether cost would be to limit spam.
However, I'd like it to be free for all users to retrieve any key stored in the contract. My understanding of Ethereum is limited, is this possible?
contract-development contract-design
asked 1 hour ago
thewonderedthewondered
161
New contributor
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'd like to create a contract through which people can set publicly available key=value information in exchange for some Ether sent to me (the owner of the contract).
This is to create a public decentralized database on which anyone can read and write, and the Ether cost would be to limit spam.
However, I'd like it to be free for all users to retrieve any key stored in the contract. My understanding of Ethereum is limited, is this possible?
contract-development contract-design
contract-development contract-design
asked 1 hour ago
thewonderedthewondered
161
New contributor
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
thewonderedthewondered
161
New contributor
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
thewonderedthewondered
161
New contributor
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
thewonderedthewondered
161
asked 1 hour ago
thewonderedthewondered
161
161
New contributor
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
thewondered is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
I'd like to create a contract through which people can set publicly
available key=value information
You can use a mapping to store data and public method to set values
exchange for some Ether sent to me (the owner of the contract)
You can make the set method payable and check for an amount of Ether from sender
I'd like it to be free for all users to retrieve any key stored in the
contract
You can create the function a view one so no cost or transaction invlolved in reading values
is this possible?
Yes, This looks possible. It would look like below.
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) public keyValStore;
address payable public owner;
uint storeFee;
constructor(uint fee) public {
owner = msg.sender; // setting contract creator address as the owner
storeFee = fee; // setting a store fee for to set values
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value >= storeFee); // check if Ether value is greater than the store fee
owner.transfer(msg.value); // transfer Ether to owner account
keyValStore[key] = value; // setting the key value pair in mapping
}
function get(bytes32 key) public view returns (bytes32) {
bytes32 val = keyValStore[key]; // get the relavant value for the given key
return val;
}
}
answered 45 mins ago
Achala DissanayakeAchala Dissanayake
3,74481629
add a comment |
Yes it's possible, here's an example key/value store contract to help you get started that requires 1 ether to set a key/value and anyone can read the data for free:
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) private store;
mapping(bytes32 => address) private authors;
address private owner;
constructor() public {
owner = msg.sender;
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value == 1 ether);
require(store[key] == 0 || authors[key] == msg.sender);
store[key] = value;
authors[key] = msg.sender;
}
function get(bytes32 key) public view returns(bytes32) {
return store[key];
}
function withdraw(address payable receiver) public {
require(msg.sender == owner);
receiver.transfer(address(this).balance);
}
}
https://rinkeby.etherscan.io/address/0xf7e0caef5cd7a18d31343670b60ff463fa23d5c8
answered 44 mins ago
Miguel MotaMiguel Mota
2,8421027
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "642"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
thewondered is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fethereum.stackexchange.com%2fquestions%2f68654%2fhow-to-create-a-paid-keyvalue-store%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
I'd like to create a contract through which people can set publicly
available key=value information
You can use a mapping to store data and public method to set values
exchange for some Ether sent to me (the owner of the contract)
You can make the set method payable and check for an amount of Ether from sender
I'd like it to be free for all users to retrieve any key stored in the
contract
You can create the function a view one so no cost or transaction invlolved in reading values
is this possible?
Yes, This looks possible. It would look like below.
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) public keyValStore;
address payable public owner;
uint storeFee;
constructor(uint fee) public {
owner = msg.sender; // setting contract creator address as the owner
storeFee = fee; // setting a store fee for to set values
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value >= storeFee); // check if Ether value is greater than the store fee
owner.transfer(msg.value); // transfer Ether to owner account
keyValStore[key] = value; // setting the key value pair in mapping
}
function get(bytes32 key) public view returns (bytes32) {
bytes32 val = keyValStore[key]; // get the relavant value for the given key
return val;
}
}
answered 45 mins ago
Achala DissanayakeAchala Dissanayake
3,74481629
add a comment |
I'd like to create a contract through which people can set publicly
available key=value information
You can use a mapping to store data and public method to set values
exchange for some Ether sent to me (the owner of the contract)
You can make the set method payable and check for an amount of Ether from sender
I'd like it to be free for all users to retrieve any key stored in the
contract
You can create the function a view one so no cost or transaction invlolved in reading values
is this possible?
Yes, This looks possible. It would look like below.
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) public keyValStore;
address payable public owner;
uint storeFee;
constructor(uint fee) public {
owner = msg.sender; // setting contract creator address as the owner
storeFee = fee; // setting a store fee for to set values
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value >= storeFee); // check if Ether value is greater than the store fee
owner.transfer(msg.value); // transfer Ether to owner account
keyValStore[key] = value; // setting the key value pair in mapping
}
function get(bytes32 key) public view returns (bytes32) {
bytes32 val = keyValStore[key]; // get the relavant value for the given key
return val;
}
}
answered 45 mins ago
Achala DissanayakeAchala Dissanayake
3,74481629
add a comment |
I'd like to create a contract through which people can set publicly
available key=value information
You can use a mapping to store data and public method to set values
exchange for some Ether sent to me (the owner of the contract)
You can make the set method payable and check for an amount of Ether from sender
I'd like it to be free for all users to retrieve any key stored in the
contract
You can create the function a view one so no cost or transaction invlolved in reading values
is this possible?
Yes, This looks possible. It would look like below.
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) public keyValStore;
address payable public owner;
uint storeFee;
constructor(uint fee) public {
owner = msg.sender; // setting contract creator address as the owner
storeFee = fee; // setting a store fee for to set values
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value >= storeFee); // check if Ether value is greater than the store fee
owner.transfer(msg.value); // transfer Ether to owner account
keyValStore[key] = value; // setting the key value pair in mapping
}
function get(bytes32 key) public view returns (bytes32) {
bytes32 val = keyValStore[key]; // get the relavant value for the given key
return val;
}
}
answered 45 mins ago
Achala DissanayakeAchala Dissanayake
3,74481629
I'd like to create a contract through which people can set publicly
available key=value information
You can use a mapping to store data and public method to set values
exchange for some Ether sent to me (the owner of the contract)
You can make the set method payable and check for an amount of Ether from sender
I'd like it to be free for all users to retrieve any key stored in the
contract
You can create the function a view one so no cost or transaction invlolved in reading values
is this possible?
Yes, This looks possible. It would look like below.
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) public keyValStore;
address payable public owner;
uint storeFee;
constructor(uint fee) public {
owner = msg.sender; // setting contract creator address as the owner
storeFee = fee; // setting a store fee for to set values
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value >= storeFee); // check if Ether value is greater than the store fee
owner.transfer(msg.value); // transfer Ether to owner account
keyValStore[key] = value; // setting the key value pair in mapping
}
function get(bytes32 key) public view returns (bytes32) {
bytes32 val = keyValStore[key]; // get the relavant value for the given key
return val;
}
}
answered 45 mins ago
Achala DissanayakeAchala Dissanayake
3,74481629
edited 21 mins ago
answered 45 mins ago
Achala DissanayakeAchala Dissanayake
3,74481629
answered 45 mins ago
Achala DissanayakeAchala Dissanayake
3,74481629
answered 45 mins ago
Achala DissanayakeAchala Dissanayake
3,74481629
3,74481629
add a comment |
add a comment |
Yes it's possible, here's an example key/value store contract to help you get started that requires 1 ether to set a key/value and anyone can read the data for free:
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) private store;
mapping(bytes32 => address) private authors;
address private owner;
constructor() public {
owner = msg.sender;
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value == 1 ether);
require(store[key] == 0 || authors[key] == msg.sender);
store[key] = value;
authors[key] = msg.sender;
}
function get(bytes32 key) public view returns(bytes32) {
return store[key];
}
function withdraw(address payable receiver) public {
require(msg.sender == owner);
receiver.transfer(address(this).balance);
}
}
https://rinkeby.etherscan.io/address/0xf7e0caef5cd7a18d31343670b60ff463fa23d5c8
answered 44 mins ago
Miguel MotaMiguel Mota
2,8421027
add a comment |
Yes it's possible, here's an example key/value store contract to help you get started that requires 1 ether to set a key/value and anyone can read the data for free:
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) private store;
mapping(bytes32 => address) private authors;
address private owner;
constructor() public {
owner = msg.sender;
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value == 1 ether);
require(store[key] == 0 || authors[key] == msg.sender);
store[key] = value;
authors[key] = msg.sender;
}
function get(bytes32 key) public view returns(bytes32) {
return store[key];
}
function withdraw(address payable receiver) public {
require(msg.sender == owner);
receiver.transfer(address(this).balance);
}
}
https://rinkeby.etherscan.io/address/0xf7e0caef5cd7a18d31343670b60ff463fa23d5c8
answered 44 mins ago
Miguel MotaMiguel Mota
2,8421027
add a comment |
Yes it's possible, here's an example key/value store contract to help you get started that requires 1 ether to set a key/value and anyone can read the data for free:
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) private store;
mapping(bytes32 => address) private authors;
address private owner;
constructor() public {
owner = msg.sender;
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value == 1 ether);
require(store[key] == 0 || authors[key] == msg.sender);
store[key] = value;
authors[key] = msg.sender;
}
function get(bytes32 key) public view returns(bytes32) {
return store[key];
}
function withdraw(address payable receiver) public {
require(msg.sender == owner);
receiver.transfer(address(this).balance);
}
}
https://rinkeby.etherscan.io/address/0xf7e0caef5cd7a18d31343670b60ff463fa23d5c8
answered 44 mins ago
Miguel MotaMiguel Mota
2,8421027
Yes it's possible, here's an example key/value store contract to help you get started that requires 1 ether to set a key/value and anyone can read the data for free:
pragma solidity >=0.4.22 <0.6.0;
contract Store {
mapping(bytes32 => bytes32) private store;
mapping(bytes32 => address) private authors;
address private owner;
constructor() public {
owner = msg.sender;
}
function set(bytes32 key, bytes32 value) public payable {
require(msg.value == 1 ether);
require(store[key] == 0 || authors[key] == msg.sender);
store[key] = value;
authors[key] = msg.sender;
}
function get(bytes32 key) public view returns(bytes32) {
return store[key];
}
function withdraw(address payable receiver) public {
require(msg.sender == owner);
receiver.transfer(address(this).balance);
}
}
https://rinkeby.etherscan.io/address/0xf7e0caef5cd7a18d31343670b60ff463fa23d5c8
answered 44 mins ago
Miguel MotaMiguel Mota
2,8421027
edited 36 mins ago
answered 44 mins ago
Miguel MotaMiguel Mota
2,8421027
answered 44 mins ago
Miguel MotaMiguel Mota
2,8421027
answered 44 mins ago
Miguel MotaMiguel Mota
2,8421027
2,8421027
add a comment |
add a comment |
thewondered is a new contributor. Be nice, and check out our Code of Conduct.
thewondered is a new contributor. Be nice, and check out our Code of Conduct.
thewondered is a new contributor. Be nice, and check out our Code of Conduct.
thewondered is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Ethereum Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fethereum.stackexchange.com%2fquestions%2f68654%2fhow-to-create-a-paid-keyvalue-store%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
