bloxberg Demonstration Notebook
bloxberg Demonstration Notebook
Accessing bloxberg blockchain data
Supplementary material for the book “Innovations in Social Finance” and for users of FairAi.uk
BlockchainData
BlockchainData
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Ask the latest information about the bloxberg blockchain data.
In[]:=
BlockchainData[BlockchainBase"bloxberg"]//Dataset
Out[]=
BlockchainBlockData
BlockchainBlockData
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Let’s check information about the latest block.
In[]:=
BlockchainBlockData[-1,BlockchainBase"bloxberg"]//Dataset
Out[]=
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Let’s check information for specific block number.
In[]:=
BlockchainBlockData[4952741,BlockchainBase"bloxberg"]//Dataset
Out[]=
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Let’s check information for specific block hash.
In[]:=
BlockchainBlockData["09718a7d5fd0fd9c6066aa3738d4d08d4be787e59fd954bbeedab800c0da8010",BlockchainBase"bloxberg"]//Dataset
Out[]=
BlockchainTransactionData
BlockchainTransactionData
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Let’s check information about the blockchain transaction using a transaction hash.
In[]:=
BlockchainTransactionData["de99f19438d0fbd151b6f718d5eb2368d3c1a3c59a8d29df06231cd626536876",BlockchainBase"bloxberg"]//Dataset
Out[]=
BlockchainAddressData
BlockchainAddressData
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Let’s check information connected with the specified address.
In[]:=
BlockchainAddressData["aA84378fA41da83a9B6523bA46E45A664FbEBFC8",BlockchainBase"bloxberg"]//Dataset
Out[]=
BlockchainTokenData
BlockchainTokenData
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Let’s check all the tokens deployed on the bloxberg blockchain
In[]:=
Dataset[BlockchainTokenData[All,BlockchainBase"bloxberg"],MaxItemsAll]
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Let’s check holder’s tokens.
BlockchainContractValue
BlockchainContractValue
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Let’s check the RelaySet contract address
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Ask for the owner address calling the “owner” property at the RelaySet contract
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The syntax to use the Typed symbol is the following:
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Typed[func, datatype], where the func and datatype is defined in a Solidity smart contract code
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Typed[property, datatype], where the property and datatype is defined in a Solidity smart contract code
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Ask for the current validators calling the function “getValidators” at the RelaySet contract.
$BlockchainBase
$BlockchainBase
Gives the name of the default blockchain to be used for blockchain computations. By default it is Automatic which for the blockchain computations is Bitcoin.
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Changing the setting to bloxberg:
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BlockchainData will use the current setting for $BlockchainBase:
Exploring Units on bloxberg
In the following weeks Unit will have support for the official symbol of bergs
Create a bloxberg account
Generate an address to make basic transactions on the bloxberg blockchain network. As bloxberg is based on Ethereum, the next steps generate a valid address and key pair as well.
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First we need the private and the public key. We generate those keys with GenerateAsymmetricKeyPair.
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The following shows the private key in HEX string
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The following shows the private key in HEX string
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Use BlockchainKeyEncode to derive a unique new Ethereum address from the public key, it can be used as a bloxberg account address:
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Use BarcodeImage to create a QR code associated with this Ethereum address
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Send QR code, use SendMessage to send the address and QR code to your mobile device
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Save your private key. Use Export to save the private key to a .wl file for later use:
Send bergs
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Changing the setting to bloxberg:
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Set the addresses of the sender and the receiver
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Use BlockchainAddressData to check receiver’s balance
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Use BlockchainAddressData to check the balance and the transaction count of the sender
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Set a gas price
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Use BlockchainTransaction to build the transaction object, using the preceding transaction count and gas price. The following example will send 1 Gbrox to the receiver’s address.
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The transaction exists locally until it is submitted to the bloxberg blockchain
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Use BlockchainTransactionSign to sign the transaction with the private key as HEX string
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Another option it to use the key pair coming from the BlockchainKeyEncode. In this way, your private key is not exposed as HEX String
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Use BlockchainTransactionSubmit to send the transaction to the blockchain
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After the transaction is submitted, you must wait for it to be included in a block.
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Use BlockchainTransactionData and the transaction ID to check if the transaction has been added to the blockchain.
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Use BlockchainAddressData to check the receiver’s balance. The previous balance was 13 Gbrox but now it’s 14 Gbrox
Verify a transaction using a Cryptographic Digital Signature
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Use BlockchainTransactionData with a transaction ID, the output includes a TransactionDigest, a Digital Signature and the sender’s Public Key.
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Use VerifyDigitalSignature to verify the signature with the public key
Use Case: “Verify & Certify”
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Let’s hash a Notebook with research data on Coronavirus
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We also need UNIX time and the certify contract address.
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To send a transaction, an address with some berg balance and a private key are required
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Use BlockchainAddressData to know the transaction for the address
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Set a gas price value
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Use BlockchainTransaction to build a transaction that calls to createData which is a function in the certify smart contract
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Where the FunctionCall key parameter set the Function and Inputs to call to a smart contract’s function
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Typed[func, {idatatype1, idatatyp2,...}] -> {odatatype}, the left side of this rule set function name and the Solidity datatype of the inputs. The right side set the Solidity datatype of the output.
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Inputs -> {ivalue1, ivalue2,...}, This rule set the input values
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Use BlockchainTranscationSign to sign the transaction
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Use BlockchainTransactionSubmit to submit the transaction
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Let’s check if our transaction has been added to the blockchain.
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Use the TransactionID to verify the transaction
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The following works as the bloxberg verifying application