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Substrate and Polkadot

Beta Q&A site for developers building blockchains with the Substrate SDK, including all parachain developers building on Polkadot, Kusama and other related technologies.

This proposal is now in the Beta phase — example questions are locked!

89 Example Questions (3 closed)

active newest votes
up vote 23 down vote
How do I do a runtime upgrade?
added by Santiago Nov 3 '21 at 10:19
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This is outlined here: docs.substrate.io/tutorials/v3/forkless-upgrades It is always a good first step to use the search bar on the devub for key words related to your question, and then do the same here on SE or SO to see if it's already answered/solved :) – NukeManDan Nov 16 '21 at 18:17
up vote 16 down vote
How do I start developing with substrate?
added by Paradox Nov 3 '21 at 10:18
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up vote 16 down vote
How do I choose between a parachain, a parathread and a smart contract for my project?
added by Ki Chjang Nov 5 '21 at 1:09
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up vote 14 down vote
What is a pallet? What are the components of a pallet?
added by Dan Forbes Nov 3 '21 at 11:51
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up vote 13 down vote
What is the RPC endpoint to find the Block Time and Block Propagation Time?
added by Shawn Tabrizi Nov 3 '21 at 9:58
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up vote 12 down vote
What is the relationship between Aura, BABE, and GRANDPA?
added by Dan Forbes Nov 3 '21 at 11:48
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up vote 11 down vote
How do I create a Proof-of-Work based chain with Substrate?
added by Shawn Tabrizi Nov 3 '21 at 10:01
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Build a Bitcoin-like blockchain in 3 hours using the Substrate blockchain framework: youtu.be/Ey0LGOCzOAw – Eduardo Cardoso Nov 17 '21 at 3:35
up vote 11 down vote
What does the `transaction_version` setting mean when publishing a new runtime?
added by Shawn Tabrizi Nov 3 '21 at 10:04
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up vote 11 down vote
How do I construct an XCM to transfer assets from one chain to another?
added by Ki Chjang Nov 4 '21 at 23:50
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up vote 11 down vote
How can I filter out callable pallet functions from a runtime?
added by Sacha Lansky Nov 9 '21 at 16:45
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up vote 10 down vote
How do I query the balance of a user in JavaScript?
added by Shawn Tabrizi Nov 3 '21 at 9:59
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up vote 10 down vote
What is the difference between using `saturating_add` vs `checked_add`?
added by Shawn Tabrizi Nov 3 '21 at 9:59
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up vote 10 down vote
Is it mandatory to use the Rust nightly toolchain to compile Substrate base projects ?
added by Chevdor Nov 3 '21 at 9:59
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up vote 10 down vote
How can I test newly added types using the PolkadotJS UI ?
added by Chevdor Nov 3 '21 at 10:00
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up vote 10 down vote
Using Typescript(Javascript, how can I subscribe to events and notified when a balance changes ?
added by Chevdor Nov 3 '21 at 10:01
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up vote 10 down vote
How can I retreive the list of modules and calls a runtime supports ?
added by Chevdor Nov 3 '21 at 10:03
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up vote 10 down vote
What is the best practice to backup the synced relay chain blocks? Ideally to spin up more validators easily
added by Sam Elamin Nov 3 '21 at 10:04
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up vote 10 down vote
How can I call runtime function from Ink! smart contract? and vice versa.
added by frankli-dev Nov 3 '21 at 10:22
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This is through chain extensions, outlined here: paritytech.github.io/ink-docs/macros-attributes/… It is always a good first step to use the search bar on the devub for key words related to your question, and then do the same here on SE or SO to see if it's already answered/solved :) – NukeManDan Nov 16 '21 at 18:19
up vote 10 down vote
What all exactly needs to be done to morph, a solo substrate built on the node-template running on aura + staking, into a parachain?
added by Shoeb Siddiqui Nov 3 '21 at 10:51
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up vote 10 down vote
How can I send multiple transactions at once without worrying about nonces?
added by Swader Nov 3 '21 at 11:11
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up vote 10 down vote
How can I construct an offline transaction for later signing?
added by Swader Nov 3 '21 at 11:13
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up vote 10 down vote
How does modular/hot-swappable consensus work in Substrate?
added by Dan Forbes Nov 3 '21 at 11:46
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up vote 10 down vote
How to print out debug messages in Substrate runtime?
added by Denis Pisarev Nov 3 '21 at 13:54
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This is outlined here: docs.substrate.io/v3/runtime/debugging It is always a good first step to use the search bar on the devub for key words related to your question, and then do the same here on SE or SO to see if it's already answered/solved :) – NukeManDan Nov 16 '21 at 18:20
up vote 10 down vote
What are the weights in Substrate?
added by Denis Pisarev Nov 3 '21 at 14:02
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up vote 10 down vote
What is the difference between Substrate and FRAME? Can you use just one? Are their alternatives to either?
added by JoshOrndorff Nov 3 '21 at 14:51
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This is outlined here: docs.substrate.io/v3/concepts/runtime It is always a good first step to use the search bar on the devub for key words related to your question, and then do the same here on SE or SO to see if it's already answered/solved :) – NukeManDan Nov 16 '21 at 18:21
up vote 10 down vote
How to mock an off-chain worker for the unit tests?
added by AurevoirXavier Nov 3 '21 at 16:25
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up vote 10 down vote
How would I prioritise signed transactions from off-chain workers across multiple pallets by configuring a signed `TransactionPriority` type?
added by Luke Schoen Nov 3 '21 at 20:03
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up vote 10 down vote
Why do parachain collators only need an Aura session key?
added by Luke Schoen Nov 3 '21 at 20:48
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up vote 10 down vote
How to support two currencies in the system?
added by AurevoirXavier Nov 4 '21 at 4:31
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The best fit for this typically is the assets pallet: github.com/paritytech/substrate/blob/master/frame/… – NukeManDan Nov 16 '21 at 18:23
up vote 10 down vote
Is possible to modify the block/session/era time for a live chain?
added by AurevoirXavier Nov 4 '21 at 4:35
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up vote 10 down vote
How much Rust knowledge is required to build on Substrate?
added by Ki Chjang Nov 5 '21 at 1:10
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up vote 10 down vote
I've now created a Substrate node using the template, what kind of interesting things can I do with it?
added by Ki Chjang Nov 5 '21 at 1:13
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up vote 10 down vote
How do you add an storage migration for a pallet to run during runtime upgrades?
added by Hamid Nov 5 '21 at 10:46
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up vote 10 down vote
When should we use `expect` and when should we return an error?
added by AurevoirXavier Nov 6 '21 at 13:36
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up vote 10 down vote
How could I use off-chain worker to upload files to IPFS?
added by Jimmy Chu Nov 6 '21 at 21:06
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up vote 10 down vote
What's the best way of migrating state from a solochain to a parachain?
added by Santiago Nov 8 '21 at 14:28
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up vote 10 down vote
How can I define a custom RPC and use it to call into a Runtime API?
added by Sacha Lansky Nov 9 '21 at 15:40
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up vote 10 down vote
What are some best practices for runtime engineering?
added by Sacha Lansky Nov 9 '21 at 16:27
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up vote 10 down vote
What are good use cases for implementing a custom signed extension ?
added by Sacha Lansky Nov 9 '21 at 16:40
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up vote 10 down vote
What is the relation between enabling the `"std"` feature/`no_std` attribute and building native/Wasm binaries, and which builds exactly are executed?
added by mkl Nov 13 '21 at 22:39
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