One of the main problems in the smart legal contract is to maintain trusted and legal valid the passage between the legal text of the document and its coding in the blockchain platform. This solution offers a platform based on blockchain (e.g., Ethereum, Algorand) that stores in IPFS (InterPlanetary File System) the documents (e.g., contract, regulations, administrative acts) using the electronic identification for the authentication of the actors. We are compliant with eIDAS regulation and SPID, in this way the legal document tracked in the blockchain and executed by smart contract is indissoluble linked with the intelligible legal document human-readable, implementing in this way the principle of explicability and transparency. Open data Licence, Internet of Things policy, Privacy data policy and agreement are only some examples of scenario manageable with this platform.