1. Act 0.1 released. https://fv.ethereum.org/2021/08/31/act-0.1/. Accessed 21 Feb 2022
2. Deposit Contract deployed on Ethereum mainnet. https://etherscan.io/address/0x00000000219ab540356cbb839cbe05303d7705fa#code. Accessed 21 Jan 2022
3. Deposit Contract specification and source code. https://github.com/ethereum/consensus-specs/blob/master/specs/phase0/deposit-contract.md. Accessed 21 Jan 2022
4. Echidna source code and documentation. https://github.com/crytic/echidna/, Accessed 21 Jan 2022
5. ERC20 documentation. https://eips.ethereum.org/EIPS/eip-20. Accessed 21 Jan 2022