Abstract—IDHub is a platform for digital identity applications.Benefited from decentralized architecture of blockchainand privacy protection via smart contracts, IDHub empowersusers with identity sovereignty: “I own my identity and I havefull control over my identity.” IDHub helps migrant workers,refugees, or economically disadvantaged by providing ubiquitousaccesses to their digital identities. Combine with attestations ofauthorities and third parties, IDHub facilitates the process of microcredit, digital payment, and financial inclusion. By buildinga transparent and reliable ID as a Service (IDaaS) ecosystem,IDHub achieves our ambition: “One identity, one world.”Keywords—IDHub, digital identity, blockchain, smart contract,attestation, financial inclusion, microcredit.