The conversion changed the unit; the rename kept it
XCN did not begin as a fresh 2022 blank slate. Chain’s earlier CHN became the input to a conversion contract and exchange migration: one CHN was surrendered for 1,000 XCN. The code burned the CHN and issued the larger number of units, so a chart spanning the change must not read the unit jump as organic issuance.
The canonical Ethereum contract still calls itself “Chain” and records delegated vote checkpoints. It minted 21,537,311,000 XCN at deployment and exposes a migration mint path capped by a Solidity constant. Onyxcoin is therefore a later public identity wrapped around code whose internal name remembers Chain.
A Bittrex notice updated February 1, 2023 reports its completed change from Chain (XCN) to Onyxcoin (XCN), with wallets and trading enabled and no holder action required. This documents completion at that exchange by that date, not the first rename date across all markets. Unlike the CHN conversion, it kept the asset.
