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  • Aug 29 11:53

    xpepermint on master

    Create FUNDING.yml (compare)

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    xpepermint on master

    Bump version Merge pull request #694 from xp… (compare)

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    xpepermint on master

    Update wanchain testnet url. Update eslint config. Fix line length. and 4 more (compare)

  • Aug 12 11:21
    xpepermint closed #692
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Kristijan Sedlak
@xpepermint
Yes but depends on your use case. Please explain.
Karega McCoy
@karega
I just want to call functions on a smart contract through a provider.
Kristijan Sedlak
@xpepermint
0xcert is optimized for NFTs. If you work with NFTs then this is the framework for you. You can also use any 0xcert provider to perform a direct call to any contract but you should be familiar with how things actually work in Ethereum to be able to do that.
Karega McCoy
@karega
Ahh so there's no API that does it. I was looking through the documentation trying to find it.
Tadej Vengust
@MoMannn
 const functionSignature = '0x6e553f65';
        const inputTypes = ['uint256', 'address'];
        const attrs = {
          from: 'address',
          to: 'address'
          data: functionSignature + provider.encoder.encodeParameters(inputTypes, ['uint256', 'address']).substr(2)
        };
        const res = await provider.post({
          method: 'eth_sendTransaction',
          params: [attrs]
        });
        const mutation = new Mutation(provider, res.result);
here is an example of how you do it
provider has post opction where you can directly make a call
and .encoder option do encode / decode params for smart contracts
but you need to know how to make rpc call
Karega McCoy
@karega
Thanks
Azlan
@azizazlan

Hi, I had the following codes and it was working fine all along. I have the current version 2.0.2. Version 1.9.0 also works fine last time.

    var options = { 
        sandbox: false,
        network: "rinkeby",
        clientId: "xxx",
        credentialsId: "yyy,
        credentialsSecret:
            "zzz"
    };  
    var bitskiBackEndProvider = new BitskiProvider(options);
    const availableAccounts = await bitskiBackEndProvider.getAvailableAccounts();

with the following error:

(node:54968) UnhandledPromiseRejectionWarning: ProviderError: GenericProvider error [issue: 0]
    at /Users/azlan/Projects/myapp/node_modules/@0xcert/ethereum-generic-provider/dist/core/provider.js:194:23
Tadej Vengust
@MoMannn
That is weird
Can you set in options verbose: true
and try again
This should print out a bit more information about what is going on and if you could print them here
This stopped working when you upgraded to 2.0.2?
Azlan
@azizazlan

Hi @MoMannn, I tried again as the followings:

const run = async () => {
    var options = {
        verbose: true,
        sandbox: false,
        network: "rinkeby",
        clientId: "02042...096d01a54a",
        credentialsId: "82471...6f9571449de",
        credentialsSecret: "31uHwzy5SvxMHD...BuSSWvx"
    };
try{
    var bitskiBackEndProvider = new BitskiProvider(options);
    const availableAccounts = await bitskiBackEndProvider.getAvailableAccounts();
    console.log(availableAccounts);
}catch(error){
console.error(error);
}

Error:

[InternalError: Internal error] { code: -32603 }
ProviderError: GenericProvider error [issue: 0]
    at /Users/azlan/Projects/waqafminter/node_modules/@0xcert/ethereum-generic-provider/dist/core/provider.js:194:23 {
  issue: '0',
  original: [InternalError: Internal error] { code: -32603 }
}

It was working with version 2.0.2. Just to be sure, I also created a new Bitski app(called "waqafminter") and create different clientId, credentialsId and credentialsSecret. And another wallet for the app inside Bitski developer page.

Thank you.

I also try the old code using version 1.9.0. Now even the old ones does not work and gave the same error. I got the feeling its on the Bitski side.
Tadej Vengust
@MoMannn
will ask bitski if they are experiancing any problems
Azlan
@azizazlan
Thank you @MoMannn
Tadej Vengust
@MoMannn
@azizazlan Bitski responded that they had an issue in one of their regions and should be back online now,
Can you check everything is ok now?
Azlan
@azizazlan
It is working now. Perhaps the South East Asia region and we are located in Kuala Lumpur, Malaysia. Thanks @MoMannn !
Tadej Vengust
@MoMannn
No problem :)
Azlan
@azizazlan

Hi,

Just want to confirm...

In the 0xcert-ethereum-asset-ledger/src/core/ledger.ts:

public async updateAsset(assetId: string, recipe: AssetLedgerObjectUpdateRecipe)

where assetId is the existing id of the asset we want to update. To get the recipe, you need id, imprint and receiverId. In other words, we can change the recipe to whatever we wish to update, including a new receiverId (new owner)?

Tadej Vengust
@MoMannn
You can only change the imprint this way
Azlan
@azizazlan
Thanks!
Azlan
@azizazlan
Is there a way to get transactions history of updates we made on the imprints from the AssetLedger?
Tadej Vengust
@MoMannn
Each imprint update throws an event to which you can hook
Azlan
@azizazlan
Yes thank you @MoMannn
Quyen Nguyen
@qnguyen12
@MoMannn Could we set gasPrice while deploying asset ledgers and creating assets?
Tadej Vengust
@MoMannn
You can set gasPriceMultiplier. Gas price is calculated as: current ethereum gas price (eth_gasPrice) * multiplier
so you can set 0.8 or 1.5 or 3 depending on how fast you want the transaction togo through
Azlan
@azizazlan
Hi all, just want to understand more about 0xcert's AIH algorithm. What exactly it is? Perhaps you could kindly point the (ts) files I should read and understand in the https://github.com/0xcert/framework
Azlan
@azizazlan
Ok maybe I should start by asking what is AIH means?
Azlan
@azizazlan
Yes! Thank you. Thank you @xpepermint .
Kristijan Sedlak
@xpepermint
Np
Azlan
@azizazlan
The statement from the documentation, The data[0].nodes[0].hash path is the root hash which represents asset imprint and should be saved to the blockchain. What is the smart contract (perhaps, you can point to the *.sol file) that responsible to execute the following codes:
const mutation = await assetLedger.createAsset({
  id: '100',
  imprint: 'aa431acea5ded5d83ea45f1caf39da9783775c8c8c65d30795f41ed6eff45e1b', 
  receiverId: provider.accountId,
}).then((mutation) => {
    return mutation.complete();
});
Azlan
@azizazlan

For example, in the framework/packages/0xcert-ethereum-erc721-contracts/src/contracts/nf-token.sol, the mapping variable idToOwner:

  /**
   * @dev A mapping from NFT ID to the address that owns it.
   */
  mapping (uint256 => address) internal idToOwner;

Does the uint256 represent imprint or asset id?

Kristijan Sedlak
@xpepermint
The smart contract is the one you deployed - we call it an Xcert and the JS interface AssetLedger interacts with it. The deployment process is covered here https://docs.0xcert.org/api/guides/asset-ledger-deployment.html.
Azlan
@azizazlan
Thank you. Learnt a lot!
Kristijan Sedlak
@xpepermint
👍
Azlan
@azizazlan
Let' say two persons (the first is genuine party and the second is an imitator/faker) "accidentally" deployed two AssetLedgers, both with an identical AssetLedger's definition (and schemaId). Possible right? If so, the only thing that can differentiate between them is the address of the AssetLedger. Is this correct?
Tadej Vengust
@MoMannn
Correct
Nathaniel
@NathanielCoder_twitter
Hi. I am new. Soon will be released Ethereum 2.0 , how much does it change for you and code, will you support Ethereum 2.0? If I or someone plans to use your project, how long do you plan to support it (code updates, fixes and improvements, new versions), what is time span you plan to support project?
Kristijan Sedlak
@xpepermint
We already did some tests for 2.0 and it should work.
We will add necessary changes as needed.
Nathaniel
@NathanielCoder_twitter
ok, thank you.