ERC777 vs ERC20
The standard used for the tokens on the Ethereum blockchain is currently the so-called ERC20 and, since its introduction in 2015, 190,000 Ethereum-compatible tokens have been created thanks to the various ICOs (Initial Coin Offerings), which have allowed these tokens to spread.
The ERC20 standard (an acronym for Ethereum Request for Comments; the number indicates the improvements suggested by EIP – Ethereum Improvement Proposal), proposed by Fabian Vogelsteller and Vitalik Buterin in November 2015, is a model for smart contracts created on the Ethereum blockchain where the following information is stored:
- The address and the relative balance
- The name of the token where they’re going to position themselves;
- The abbreviation of the token’s name – also called ticker – usually has 3 or 4 letters;
- The position of the number of decimals where the token will be stored;
- The list of token holders with their balance;
- Specifications about the fact that the contract manufacturer can issue its own standardised tokens.
Obviously, this standard has limits: if we send a transaction to a smart contract and this does not recognise our transaction then we will irrevocably lose the entire amount sent.
The proposal of the ERC777 standard by Jordi Baylina, Jacques Dafflon and Thomas Shababi offers a new possibility of interaction with smart contracts while maintaining compatibility with the previous ERC20 standard. In fact, the new standard maintains all the previous functions and, in addition, if tokens are accidentally sent to an incorrect smart contract, instead of being lost, they will be automatically sent back to the sender.
Greater efficiency also means higher gas costs compared to the ERC20 standard, although marginal.