2021 legal-tender experiment for Bitcoin, plus government accumulation and IMF negotiation drama.

Nigeria's CBDC experiment, often contrasted with grassroots stablecoin and Bitcoin usage.

A high-profile 2017 to 2018 smart-contract project that raised a record ICO and later faded from leadership.

Years of U.S. spot Bitcoin ETF denials before the 2024 approvals, shaping the GBTC premium/discount saga.

Ether's 2021 peak near $4.8k, still the reference high for many cycle charts years later.

The chain that rejected the DAO bailout fork and kept the original Ethereum history.

The Prague-Electra Ethereum upgrade activated in May 2025, combining execution-layer and consensus-layer changes including EIP-7702 account delegation.