BlockSigner smart contract can't be called

[morteza94]

the xdc0000000000000000000000000000000000000089 address is the address for the BlockSigner contract. But the bytecode for this contract is not present on the latest blocks therefore it cannot be called from another smart contract or web3 clients. But the bytecode does exist on the first few blocks.

[gzliudan]

Test command:

RPC="https://arpc.xinfin.network/"
RPC="https://earpc.apothem.network/"

curl -s -X POST -H "Content-Type: application/json" ${RPC} -d '{
  "jsonrpc": "2.0",
  "id": 8001,
  "method": "eth_getCode",
  "params": [
    "'"${ADDRESS}"'",
    "'"$(printf 0x%x ${NUMBER})"'"
  ]
}' | jq

when NUMBER=2999999

{
  "jsonrpc": "2.0",
  "id": 8001,
  "result": "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"
}

when NUMBER=3000000

{
  "jsonrpc": "2.0",
  "id": 8001,
  "result": "0x"
}

[gzliudan]

This contract is deleted at block 3000000 by below code:

https://github.com/XinFinOrg/XDPoSChain/blob/master/core/state_processor.go#L148-L150

    if common.TIPSigning.Cmp(header.Number) == 0 {
        statedb.DeleteAddress(common.HexToAddress(common.BlockSigners))
    }

since:

var TIPSigning = big.NewInt(3000000)

[s1na]

Is it not because it was replaced by native Go code? https://github.com/XinFinOrg/XDPoSChain/blob/f041ad5a9b32e30af53ea0a5105b22d827045b51/core/state_processor.go#L449