All Questions

Does the --actor-whitelist and --contract-whitelist work in the sense that if the list is set for that block producer that only those actors can perform transaction and only those contracts may be ...

My goal is to make a snapshot which contains the state of the blockchain untill a specific block (probably not block header). So the specific block must be "older" than the block header. For ...

I have table with multiple rows for one account and i need to get all of his rows in mu smart contract, but i can't understand how i can get all rows in one time . Can someone explain me? thanks

I try to create two tables and mult_index, I received an error on output. header file #include <eosio/eosio.hpp> #include <eosio/asset.hpp> using namespace eosio; CONTRACT game : public ...

I am unable to understand the CPU and NET fraction values in the powerup action in eosio.system. For example, what should be the fraction values if I want to powerup 1.5 ms of CPU and 1 KB of NET.

I'm trying to write a contract that has a table with few vectors, even tho it seems to be writing all the values correctly it fails to read the values back. The structs and tables are bellow: struct ...

Title says it all. I'd like to get data from atomic assets' attribute map. This is the link to their docs https://github.com/pinknetworkx/atomicassets-contract/wiki/Custom-Types#atomic_attrbiute tried ...

What would be a good example of a smart contract that will allow users to stake NFTs and withdraw an amount of a certain token on a daily basis?

I'm working on one node which is running on a testnet, and since I'm kinda new to this environment I'm wondering how can I drop privilege level to a non-root user for running a node on a server? Can I ...

I want to convert a series of data/object/struct into a json text before saving it into my table. Is this possible?

When attempting to query a specific block against the trace_api on an EOS node that has full chain data and I'm receiving a 404 error. curl https://mynode.localhost/v1/trace_api/get_block --data '{&...

Outside of BP's burning EOS tokens, how can an average user or contract burn EOS tokens? I imagine transferring to eosio.null is the only way?

set contract: cleos set contract eosio ./eosio.system -p eosio@active I get : Error 3070003: Serialization Error Processing WASM Publishing contract... Error 3070003: Serialization Error Processing ...

I have a transaction number showing the 300 went to another address. Think it mighta been the wrong address. I was staking form trust wallet which is a binance address but I think it mighta sent to an ...

I created and tested my smart contract on testnet. Now I want to deploy it on mainnet, I assume I have to purchase some EOS token and buy ram, cpu and net... I can't find anything in the docs about ...

I created my own eosio token based on the eosio.token contract. Now, I want to ideally deploy my token to mainnet and list it on a decentralized exchange (uniswap, pancakeswap, etc...) Assuming that I ...

I tried to create a function to transfer multiple tokens on one transaction. code. token.cpp void token::transfers(const name &from, const name &to, ...

Is there any good resources on how to develop plugins? The plugin creating script was updated years ago and even the custom plugins in https://github.com/liquidapps-io/awesome-eosio-plugins seem to be ...

I'm using Anchor Wallet to sign my transactions (through UAL) and sometimes, it's bugging with this error whenever I try to sign a transaction: Skipping resource provider: Blockchain not supported by ...

I want to implement RNG on EOS the mainnet. My reference is the WAX ORNG smart contract It is based on the signidice which is an Ethereum implementation. That algorithm is based on an external oracle ...

I was thinking on good practices when creating the persistence using the multi-index API, more specifically regarding future updates to the table model (ie. adding new members to the struct). All the ...

cleos -u https://wax.greymass.com push transaction test.json this command in console works exec("cleos -u https://wax.greymass.com push transaction test.json",$out,$tr); this code in php - ...

I am making a game that generates a list of winners every round end and lets those winners claim their rewards every round. The way I made it work is to have the server write to a multi index table in ...

I want to store json key-value pairs in an eosio table. The keys in the json are unique and that's why it would be perfect to use them as primary_key or secondary_id for querying the table later. The ...

I am trying to mint an NFT as a reward for player via the smart contract, here is my code. eosio::action mint_action = eosio::action( eosio::permission_level(_self, eosio::name("active")), ...

the following error was encountered recently, any way to check the inline action depth of the transaction on blockchain explorer or other approach? max inline action depth per transaction reached

Im installing the Wax Dev docker container via: docker run -it --name waxdev -v c:\wax:/wax waxteam/dev bash I then go to run the basic tutorial of creating a simple EOSIO.token from https://...

When writing contracts, the contract class in file name_a.cpp is defined as follows: class[[eosio::contract("name_a")]] name_b : public contract {..} In my understanding the name of the ...

Is it possible to set code permission inside EOS Studio? I'm getting this error when I try to add one

I want to sign and send transactions (generally trigger any smart contract action) from a c++ external app. How can I do this? If my app was in javascript, that would be easy since I know that I can ...

Ideally we need a Merkle Proof that a certain row is in a table. However, we may adapt our need to any form of Merkle Proof about a state or presence of a transaction. As far as I understand, the ...

From within a smart contract, I would like to discover whether an account has defined a specific permission name. I don't want to test whether it has that authorization (require_auth()); just whether ...

The environment is like this The user will click the login button to log in to the cloud wallet, so that the code gets the user's login permissions, but when performing certain actions, you still need ...

I do have a use case where I need to sign a transaction on an edge device without having connection to the chain (but lets consider chain ID , user and private key are well known on the edge). I am ...

I know that I can use eosjs to read/query multi_index table data from the chain. However, my goal is to listen to/on these changes. Specifically, I want to receive a notification whenever something ...

so I'm trying to use the recovery_key function linked here: https://developers.eos.io/manuals/eosio.cdt/latest/group__crypto/?query=recover_key&page=1#function-recover_key Whenever I do use it ...

There are not much or daily transactions on the blockchain but BP's are producing blocks continuously. These blocks are empty. Can't we produce blocks only when the transaction is to be execute? Is ...

I know that eosio has http plugins, which is why I'm thinking that maybe a http library is embedded to the eosio.hpp and that I can use it internally to send http requests. Is this possible? My goal ...

Ok, so I made a beginner coding error in a token contract, mis-typing the return value from get without & (yes, I now see the Warning in the docs at https://developers.eos.io/manuals/eosio.cdt/...

I am wondering if i can encrypt the parameters i pass to my action and decrypt the parameter in the smart contract. The goal would be to prevent the people to abuse the action. The action mint an nft ...

I normally use eosio-cpp to compile my smart contract, but recently I needed to use an external lib and link to it to build my project. I checked the docs here, but it basically shows how to use cmake ...

I initially came from Ethereum and found out about ECDSA there. I'd like to do something similar at EOS. I have found this code: https://github.com/miguelmota/eos-ecverify but it doesn't compile when ...

I'm building an app that consists of two services, one service will run on the edge and the other in the cloud. Obviously, I want the service on the edge to be lightweight since It will run on ...

I try to use waxjs V1.0.4. For example, I wanna know info about user account.If I copy code from example, it looks like this: import * as waxjs from "@waxio/waxjs/dist/index.js"; const wax =...

I'm currently trying to run WAX Mainnet locally but was getting unlinkable_block_exception. I tried to sync from different snapshots but was getting the same error. Starting from a genesis file didn't ...

Do you have some example that shows how to design an action for a smart contract that when the user sends a REDEEMCODE action the smart contract will transfer some quantity of a custom token for the ...

is it possible to listen the return asset quantity of specified account in contract? e.g i use contract(A) to send asset of the specified account(B) to a DEX, can i listen the return asset quantity on ...

I have following action in my smartcontract: ACTION uploadfile1 (name creator, vector<uint8_t> content, string filename) I'm trying to push action from my Swift application using following code:...

I can't seem to manage to unstake my tokens on EOS Authority using the Anchor app. This is my account: haydemrwgqge. It keeps saying I don't have the permission although I am pretty sure I have the ...

In EOS, smart contracts can be updated by the account owner. This could be a problem for certain applications in finance. For instance, if I want to deploy a token, the transfer function should be non-...