Blockchain

Hi, I have created a private Ethereum block chain using the AWS provided Ethereum Blockchain template in us-east-1. I have followed the following How-To https://docs.aws.amazon.com/blockchain-templates/latest/developerguide/blockchain-templates-ethereum.html#blockchain-ethereum-prereq-vpc The stack gets up, i can see the stats and explorer urls using the bastion host. But Metamask does not connects to the provided url on port 8545. What could be the reason. although port 8545 responds to telnet, this means its not blocked. I am head over heels to find a solution so that metamask connects and i can see my chain.Chain ID i have given in the stack is 4444

Two questions. First, if you create a network on Amazon Managed Blockchain, then do you necessarily need to use AWS cloud storage? Or would it be possible to divide up the cloud storage among different providers? Second, Do all other members of an AMB network also need to use AWS cloud storage? If organization B wanted to join the network and insisted on using some other cloud storage provider, would it be possible for them to join the network? Or would the network operator need to launch a peer node on their behalf, using another AWS account?

My question is about whether it is possible to build a permissioned network with Proof of Authority on Ethereum, making use of the AWS Managed Blockchain service. If possible, I would like to know the limits of gas per block that can be handled.

Hi there, Is there a way that I can see how AWS managed blockchain stores transaction blocks on the state database, including metadata? Also is there a visual gui that I can use to view such content? I am aware that I can query via smart contract the assets I created but can I also see the additional metadata such as timestamps, hashes, etc. ? Any help would be greatly appreciated!

Hello! Please help me with one question. It is known from the documentation that only the "eth_sendRawTransaction" raw sending method is supported for sending. And this requires a private key (in the article we found how to send a raw transaction. In this article it is written about a private key that can be extracted from a file using a library on JS). But it isn't clear to us where to get the private keys of the addresses created on the node. And it isn't clear where you need to get a file that contains secret data. And if there are examples in C#, I would be very grateful. Thank you!

Hi there, I am following the steps in the aws managed blockchain and I have a problem at step 5.1(https://docs.aws.amazon.com/managed-blockchain/latest/hyperledger-fabric-dev/get-started-enroll-admin.html). When I run this command: ``` aws s3 cp s3://MyRegion.managedblockchain/etc/managedblockchain-tls-chain.pem /home/ec2-user/managedblockchain-tls-chain.pem ``` I get the following error: ``` fatal error: An error occurred (403) when calling the HeadObject operation: Forbidden ``` Like the guide mentioned, I went to this link(https://docs.aws.amazon.com/managed-blockchain/latest/hyperledger-fabric-dev/security_iam_hyperledger_ec2_client.html) and followed the steps. However, even after these steps I keep getting the same error. Any guidance or suggestions would be greatly appreciated!

Hi everyone, When I use the `SELECT` command, I see my table with no order (i.e., not ordered by ID), would you please guide me on how I can see my table in order? Thanks,

Hello everyone, I've been a software and game developer for well over a decade, and I feel very at home with C, C++ and C#/.NET. I've done a lot of programming with DirectX SDKs and Unity, as well as desktop and mobile development. However, I don't really know much at all about the web and networking. But now I'm becoming very interested in what kinds of things I can do with AWS in game development, as well as with blockchain, AI/ML and cloud computing power. There seems to be more AWS services and packages than I can count though, and I'm really not sure which ones I should be pursuing and trying to learn more about and which ones are irrelevant to me and my job. The list of services, SDKs and packages is as impressive and inspiring as it is overwhelming and confusing! I'd like to be able to deploy some .NET applications to AWS to provide remote APIs for games and applications. To start with and get the hang of it, I just want to make a little minigame that lives on a server that a Unity or Unreal game can interact with through http requests. And I'll incrementally add some features to it as I start to get the hang of it. I'd also like to do some experimentation with blockchain software and services and see what kinds of interesting things can be accomplished with it. And beyond that, I'd eventually like to get into using AI/ML to accomplish goals in games and apps, harness cloud-based CPU/GPU processing power for heavy-lifting and even setup some real-time multiplayer game servers. I just don't know what tools/services/packages I need to dive into and start figuring out. I've found [the Visual Studio 2022 AWS package here](https://marketplace.visualstudio.com/items?itemName=AmazonWebServices.AWSToolkitforVisualStudio2022&ssr=false#overview), as well as [this AWS GitHub page](https://github.com/aws/dotnet) for .NET. I've also heard about Lambda. I really have no idea which ones are relevant to me or where I should start with this. To begin with, I want to run a .NET application on a server that applications can query and interact with and have it store and supply data for them, offer some remote APIs and requests, etc. I'd also potentially be interested in running some native C/C++ modules on servers. Can someone point me in the right direction and tell me what I need to set up and dive into first? I'm doing this in my free time when I'm not working on projects for work, so my time is very limited and researching and learning the wrong things would be a big setback for me. Any help or guidance is greatly appreciated!

Hi, We have a problem with our managed blockchain network and created a "System impaired" case on 26th Jan. This has been 5 days now that this case is still in unassigned state. We just recently purchased the technical support package for this. Any help on how to get this sorted out asap? Case ID: 9535173921

Hi All, I recall from a few sessions at re:Invent last month that it was mentioned AWS is looking at expanding the blockchain options going forward for the AWS Managed Blockchain service. I volunteer with a small blockchain project that has our own distributed chain and would like to see if/how we could get added to the service as it would be a good option for future people who want to build on and utilize our chain. Does anyone know how to go about getting on the list (if one even exists) of chains to be added to the service? I couldn't open a support ticket as my personal account is just on the free account and figured I probably shouldn't use my corporate account for this query.

Hi. I try to build simple transaction system with transactionRequest registry. I store all transactionRequests in separate table. Some other module processes this transactions in batch. Batch process registers all id's of transactionRequest that has been processed. In each subsequent runs, I need to query for all new transactionRequests, registered (inserted) after last processed one (I know id of that request). Currently I query ledger for metadata of transactionRequest with given ID and use `metadata.txTime` timestamp to query all transactionRequests registered after. That's my approach to get all newest documents starting from some timestamp or documentId but, to be honest, I don't like it. I've red in documentation that it's not good approach to query with *inequality *conditions like: `SELECT data.* FROM _ql_committed_transaction_requests WHERE metadata.txTime > 'some_timestamp'` Is there some better solution for that? How can I query for all documents that appeared after some document?

A customer is using QLDB. I have seen that you can export journal data from QLDB directly to S3 by submitting the journal export request: https://docs.aws.amazon.com/qldb/latest/developerguide/export-journal.html Can this be seen as a traditional DB backup? Secondly, is there an option of 'importing' that QLDB backup into an existing ledger or into a new ledger? Thirdly, are there any plans to incorporate automatic QLDB backups into the AWS Backup service? I know QLDB is relatively new, but knowing this would calm customers already using QLDB that backups are also thing with QLDB. Thank you in advance.

Hi AWS Team, I'm trying to delete a QLDB Ledger which requires disabling Delete Protection. When I attempt to save the Ledger setting after making this change, I'm met with the error: _The encryption feature for updating an AWS KMS customer managed CMK (customer master key) is not enabled for account 344#####552. To add your account to the allow list, contact AWS Support._ Do I really need to request access to this to be able to adjust the ledger settings? Thanks, Kent.

Sorry for the NewBe question... My team is evaluating QLDB for a business requirement and needs to run a simple QLDB test in Lambda (node.js 14.x). Hoping for a super-simple QLDB Lambda 'hello world' js example that executes the following query on the AWS test ledger named 'vehicle-registration': "SELECT * FROM Person WHERE GovId = 'TOYENC486FH'". Here's what we have so far: //var AWS = require("aws-sdk"); //confirming not a dependency to instantiate driver and execute simple QLDB query? var qldb = require('amazon-qldb-driver-nodejs'); // confirming still a dependency? var ionjs = require('ion-js'); //confirming still a dependency? let jsbi = require("jsbi"); //is this a dependency ? const driver = new qldb.QldbDriver("vehicle-registration"); exports.handler = async (event) => { // TODO implement const response = { statusCode: 200, body: JSON.stringify('Is there a simple, up-to-date QLDB Lambda example for node.js 14.x?'), }; return response; }; AWS, if you're reading this, here are a few things we've observed in the documentation: * The second sentence of the QLDB Node.js Tutorial refers to AWS SDK for JavaScript API which is depreciated and comes with a note that says, "Note: You are viewing the documentation for an older major version of the AWS SDK for JavaScript (v2)." * The third sentence of the QLDB Node.js Tutorial refers to the QLDB Driver Reference. We managed to import the driver into Lambda but its a time consuming exercise in environment variables, TypeScript, and NPM. * IAM role is mentioned zero times in step one and step two * Sample code in Step 2 is written in TS even though NodeJS is the runtime for AWS Lambda, and JavaScript is default language. Edited by: 5:51 on May 14, 2021 3:00 PM Edited by: 5:51 on May 15, 2021 4:22 AM Edited by: 5:51 on May 15, 2021 5:16 AM Edited by: 5:51 on May 15, 2021 9:17 AM

Seeking clarification, the doc page (https://docs.aws.amazon.com/qldb/latest/developerguide/working.create.html) says: "Indexes can only be created on a single top-level field. Composite, nested, unique, and function-based indexes are currently not supported." So does that mean that you can only create an index on simple Ion values? I'd like to use a tuple/list of strings as a key, and while it'd be easy enough to generate a single string from the list, it'd be nice to avoid it if possible. Thanks!

In various places in the documentation the document ID is described as a unique identifier. e.g. <https://docs.aws.amazon.com/qldb/latest/developerguide/working.create.html> Is the document ID truly a GUID/UUID that uniquely identifies that document not only within a specific ledger, but across ALL possible ledgers? Is the document ID safe to expose to the outside world as a truly unique identifier? Will all document ID's be guaranteed to always be exactly 22 chars in length and match the regex ``` /^[A-Za-z0-9]{22}$/i ``` Is a document ID lexically sortable? Can you describe the format and internal state of the document ID (perhaps compared to the various types of UUID as defined by RFC 4122? I can find no detailed description of this ID. It would be helpful for this to be defined in the documentation. https://en.wikipedia.org/wiki/Universally_unique_identifier Thanks. Edited by: glenn-truestamp on Jun 27, 2020 12:30 PM Edited by: glenn-truestamp on Jun 27, 2020 12:33 PM Edited by: glenn-truestamp on Jun 27, 2020 12:47 PM

A customer is looking at using QLDB. They have a concern that this ties them into AWS. What are the options of 'migrating out' of QLDB into another ledger, if they so needed to? Apologies, I realise this is bit of a woolly question. I believe you could replay transactions into the destination system (with quite a few considerations needed). Thank you in advance.

How to compute CommitDigest for the CommitTransaction for the QLDB.sendCommand operation? I just need to know how to compute the commit digest in Javascript.