Yes. See the ION project Microsoft has led starting - its a decentralized identity project designed as a sidechain that periodically anchors its data to bitcoin

Yes. See the ION project Microsoft has led starting - its a decentralized identity project designed as a sidechain that periodically anchors its data to bitcoin's censorship resistant blockchain. See https://techcommunity.microsoft.com/t5/identity-standards-blog/ion-booting-up-the-network/ba-p/1441552 https://techcommunity.microsoft.com/t5/identity-standards-bl..., https://identity.foundation/ https://identity.foundation/, or https://github.com/decentralized-identity/ion https://github.com/decentralized-identity/ion. If your project doesn't need decentralized trust, using 'blockchain' is simply a marketing move.