Zcash development company Electric Coin Company (ECC) announced the release of ZEC V2.1.2. This version supports activation of Heartwood on the test network, with an activation height of 903800 (expected on May 6, 2020). Currently this version does not support activation of Heartwood on the mainnet. Heartwood network upgrades have deployed improvement proposals ZIP 213 and ZIP 221. ZIP 213 allows miners to directly send their mined block reward tokens to shielded addresses, and ZIP 221 enables Flyclient support by changing the semantics of the existing block header field.