Too Long; Didn't Read
Underneath Bitcoin's Double Spend Sensationalism is Proof Of Its Resilience is Proof of Its Blockchain's Resilence. Block 666833 managed to spend 0.00062063 BTC: $1,000, $1.2,000 BTC: 0.00 BTC. Block is governed by the Proof of Work (PoW) consensus protocol. Every about 2 weeks, the difficulty is adjusted, and since a time unit is introduced, then on the bitcoin blockchain the timestamp that examines the time as a parameter is introduced.