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Please use GPA for that, keep in mind it's a very slow and expensive call. https://solana-labs.github.io/solana-web3.js/classes/Connection.html#getProgramAccounts

Can use: https://docs.rs/anchor-lang/latest/anchor_lang/macro.require_gte.html Pass it your custom error so it will be easy to understand why it failed in the transaction log.

I couldn't find any example of usage, I'm trying the following and getting Attempt to load a program that does not exist. This is trying the official Solana zk-program: https://github.com/solana-labs/ …

You must pass the account to the program, you can't read from an account you didn't pass as an argument. The VM will fetch all these accounts and provide them to your program.

If you want to transfer SOL from a PDA , I found the following to be the most reliable method, from is a PDA. pub fn transfer_sol(from: &mut AccountInfo, to: &mut AccountInfo, amount: u64) -> Result<( …

You can build a transaction with multiple instructions (createTransferCheckedInstruction) to move each token (up to the instruction limit). https://solanacookbook.com/references/token.html#how-to-tran …

Trying to add check coverage, when using RUSTFLAGS="-C instrument-coverage" cargo build-bpf I'm getting: error: failed to run `rustc` to learn about target-specific information Caused by: process d …

Most of the coin-flip games you see use some form of off-chain random source (Oracle is just someone pushing into the chain something generated outside). There are ways to generate pseudo random numbe …

If it's in the browser, use: const transaction = await this.program.methods .createMerchant() .accounts({ user: this.userPubKey, merchantAccount: merchantPDA, }) .transaction() And se …

Most RPC calls are read hence you don't even sign them, so the RPC doesn't even know if you have lamports or not. I think it's only relevant for: https://solana-labs.github.io/solana-web3.js/classes/C …

Use a custom RPC , such as https://devnet.genesysgo.net the default public ones aren't suitable for that.