The first implementation of the ERC777 standard proposed by JodiBaylina, Jacques Dafflon and Thomas Shababi is the new GCA'S token; CALL. The Global Crypto Alliance has deployed the smart contract of CALL token on the Ethereum Mainnet under the contract address of 0x886785C4e5a161259C41CbCD45cD42513a95320a:

[ANN][ERC777] GCA: Global Crypto Alliance - CALL token the very first ERC777