Anniversary · 24 August · THE CHRONICLE
With block 481,824, Segregated Witness activates. Signatures are stored separately. For transactions spending only SegWit inputs, the ID can no longer be altered after the fact. The road to Lightning is open.
SEGWIT · BLOCK 481.824 · 24.08.2017
Turn it over, answer, sign – free, no account.
Source
Fact · Block 481,824, 2017-08-24 01:57:37 UTC (mempool.space); malleability: BIP141, section “Motivation” (github.com/bitcoin/bips)
The question on the back
How well do you manage to change without breaking with who you were?