6

I have contract address, and I want to find the block number, when it was deployed, to use it for loading events for this contract. Is it possible?

Rob Yart
  • 191
  • 1
  • 4
  • 1
    Why not just load events starting at block 0? – user19510 Apr 10 '18 at 16:50
  • Do you have only address? if you have transaction hash, you can use function web3.eth.getTransactionReceipt – kherwa Apr 10 '18 at 16:52
  • @smarx I though I could optimize event loading by getting the deployment block number – Rob Yart Apr 11 '18 at 17:36
  • 1
    @kherwa Thanks, no I don't have txhash, otherwise it would be easy ;-) – Rob Yart Apr 11 '18 at 17:37
  • Have you measured the performance difference? I would guess that an extra API call to figure out the deployment block takes way more time than whatever penalty there is for starting from block 0. – user19510 Apr 11 '18 at 20:24

2 Answers2

1

You are possibly looking for something more progamatic. A good starting point is the idea that each contract starts with a deployment transaction. It's always the first transaction in the contract history.

On Etherscan

enter image description here

Hope it helps.

Rob Hitchens
  • 55,151
  • 11
  • 89
  • 145
1

Assuming you know the transactionHash of the transaction which created your contract, you could just use the web3js function: web3.eth.getTransaction(transactionHash [, callback])

This will return you an object where you can access the block number you are looking for. Check this example code out!

István András Seres
  • 1,276
  • 8
  • 17