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I would like to obtain info particular smart contract - that is deployed on the RSK Testnet - to get the data values from its storage. How can I do this?
I'm using eth_getStorageAt JSON-RPC, but i'm getting unexpected results.
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In the terminal, code truffle console , which starts a console that enables you to interact with the smart contract. Try all those lines and see if you get the address. If you do, the smart contract is successfully deployed and your project can talk to it.
Call: Reading value from a smart contract You can access an instantiated smart contract methods that you provided the ABI for as follows: yourContract. methods. methodname . By using the call function you'll receive the result of executing the function.
Contract deployment is a special Ethereum transaction sent to the address 0. The deployment has the side effects of creating bytecode at a specific address (i.e, it creates a smart contract account). Contracts are deployed at predictable addresses based on the address and nonce of the account creating the contract.
Other places smart contracts can be utilized include; the Internet of Things, data science and machine learning, and legal contracts Certificate and document forgery has been a significant issue individuals and institutions have faced for years.
Digital Identifier (DIDs) smart contracts built on distributed ledger technologies (decentralized) give individuals total control of their data and allow them to share the content of their data as they please, increasing security and reducing the possibility of data mismanagement or a breach.
Distributed ledger technologies (DLTs) make smart contracts a good option for administrative payments since they are inexpensive to maintain Supply chain technology built on smart contracts is more effective and can help unlock value and reduce wasted resources
To do this, you do indeed use the eth_getStorageAt RPC request.
Here's an example:
curl \
-X POST \
-H "Content-Type:application/json" \
--data '{"jsonrpc":"2.0","method":"eth_getStorageAt","params":["0x19f64674d8a5b4e652319f5e239efd3bc969a1fe", "0x1", "latest"],"id":1}' \
https://public-node.testnet.rsk.co/
This will yield the following response
{
"jsonrpc": "2.0",
"id": 1, "result":"0x0000000000000000000000000000000000000000033b2e3c9fd0803ce8000000"
}
How it works - the eth_getStorageAt RPC takes 3 params:
ADDRESS - an address string of the smart contractSTORAGE_POSITION - a hexadecimal string for the position in the storage of the smart contractBLOCK_PARAMETER - a hexadecimal string of the integer block number for values at specific blocks, or the string latest for the latest valueThe last parameter (BLOCK_PARAMETER) is interesting, as you can use it to query historical values, and see how the data at that location within the storage changes over time, for example.
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