This block saw the activation of of three new Bitcoin improvement proposals: BIP68 - Relative lock-time (RLT), consensus-enforced semantics of the sequence number field to enable a signed transaction input to remain invalid for a defined period of time after confirmation of its corresponding outpoint. BIP112 CHECKSEQUENCEVERIFY (CSV), a new opcode for the Bitcoin scripting system that in combination with BIP 68 allows execution pathways of a script to be restricted based on the age of the output being spent. BIP133 - Median time-past as endpoint for lock-time calculations, redefining the semantics used in determining a time-locked transactions eligibility for inclusion in a block. The median of the last 11 blocks is used instead of the block's timestamp, ensuring that it increases monotonically with each block.