SignatureChain will provide a signing mechanism that creates a hash of a document and then forming a signature from that hash with a private key to finally store the signature on the blockchain. Once such a signature is stored in a blockchain, it can not be changed or deleted and the fact that your signature is in the blockchain gives you a point in time when the operation is done.
50 000 000 000 SICA
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SignatureChain listings and delistings at exchanges