Bitcoin is only resistant to tampering of historical records if you have a continuous expenditure of compute to maintain that tamper-proofness. In the absence

Bitcoin is only resistant to tampering of historical records if you have a continuous expenditure of compute to maintain that tamper-proofness. In the absence of substantial compute resources dedicated to maintaining the longest fork, there is in principle nothing stopping anyone from changing a historic blok and rolling forwards from that. The good conductivity is a base physical property, not really requiring any external investment of anything to be maintained.