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Questions tagged [polkadot]

Use this tag for questions about the Polkadot blockchain network platform. General questions about Polkadot should be asked at https://substrate.stackexchange.com

203 questions
43
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5 answers

Unable to specify `edition2021` in order to use unstable packages in Rust

I want to run an example via Cargo but I am facing an error: error: failed to parse manifest at `/Users/aviralsrivastava/dev/subxt/Cargo.toml` The full stacktrace is: error: failed to parse manifest at…
Aviral Srivastava
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7
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2 answers

Error encountered could not complete yarn install of substrate front end template

Followed the installation steps provided here https://docs.substrate.io/tutorials/v3/create-your-first-substrate-chain/ Steps taken with node version v16.14.0 git clone https://github.com/substrate-developer-hub/substrate-front-end-template yarn…
John
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5
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1 answer

The relation between using `std` and `no_std` attributes and including WASM

I've just started to study substrate, and the Add a Pallet tutorial already has me seriously confused: It is important to note that the Substrate runtime compiles to both a native Rust std binary and a WebAssembly (Wasm) binary. For more…
mkl
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5
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1 answer

How do I update my token's name in Substrate?

I have set up a custom Substrate chain, and I want to modify the display name of my token. What do I need to modify such that Polkadot JS and other APIs can discover my token name? By default it is "Unit".
Shawn Tabrizi
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5
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1 answer

How to encode the hex string representation of an account id in Substrate using Rust?

Given a hex representation: 0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d, we can get the AccountId it represents using keyring.encodeAddress() using JavaScript. However, what is the corresponding function in Rust? AccountId is…
Aviral Srivastava
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4
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1 answer

Why does "code" in spec not start with magic number and version number?

I am creating spec using ./polkadot build-spec --disable-default-bootnode --dev (I am running version 0.9.8-3a10ee63c-x86_64-linux-gnu) spec generated using above command contains code field. My understanding is that this field contains wasm bytes.…
kishan sagathiya
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4
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0 answers

How can I subscribe to a single event using Polkadot.js API?

I want to subscribe to a single event (or a list of events) using the Polkadot.js API. However, I have only found information on how to traverse events and then filter the results. In addition, the documentation about events lists all the events…
Daniel Bastos
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4
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1 answer

How do you write a system test for your runtime?

Hi I am developing a runtime using Substrate-FRAME and I would like to know how can I write a system test for my runtime? The main purpose of writing a system test is to ensure that the final build is fulfilling all of the required specifications…
Jdawg287
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4
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0 answers

Public key / Private key encryption using polkadot lib?

I'm building a substrate blockchain backed by polkadot js. While working on a task I have a requirement of public/private key encryption and decryption. for ex: Bob wants to send Alice an encrypted email. To do this, Bob takes Alice's public key and…
sachin murali
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4
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1 answer

How to find all the polkadot accounts with index or identity attached

I want to find all the polkadot accounts which either have an index or have registered their identity; similar to https://polkascan.io/polkadot/account/identities and https://polkascan.io/polkadot/indices/account.
Suryansh Singh
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4
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2 answers

Use custom types (Substrate FRAME pallet + Polkadot/Substrate frontend)

Scenario: You are developing a FRAME pallet for a custom Substrate node that uses custom types within Storage or Events. To interact with your custom Substrate node, you use the Polkadot/Substrate frontend Problem: When you query the storage that…
sea212
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4
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1 answer

Connect via WSS to Polkadot Full Noder running on local network failed

I have setup a Full Node running at a local server at 192.168.2.254. I'm just trying to make a simple script which is basically subscribe to new heads on the blockchain. const { ApiPromise, WsProvider } = require('@polkadot/api'); async function…
Minh Tran Duc
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4
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1 answer

Converting between AccountId32 and AccountId in Substrate

I have a requirement where i get passed in some bytes and i need to create an accountId from it in Substrate 2.0. Is there a way to convert between AccountId32 and ::AccountId in the runtime (FRAME) ? Or to create an…
Nahu
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3
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2 answers

Attempted import error: 'TextDecoder' is not exported from '@polkadot/x-textdecoder'

I installed following polkadot packages. "@polkadot/api": "6.10.1", "@polkadot/extension-dapp": "0.41.1", "@polkadot/hw-ledger": "8.2.2", "@polkadot/util-crypto": "8.0.2", When run the "yarn start", I got this…
hobbydev
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3
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1 answer

How to generate the public key from Polkadot Address from Substrate Side

I'm generating a Public key from PolkadotJS as follows const keyring = new Keyring({ type: "sr25519" }); const account = keyring.addFromUri("//Bob", { name: "Bob default" }); // encoded public key let public_key =…
not 0x12
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