Europeum

Europeum operates and scales Europe’s sovereign digital trust infrastructure, enabling secure, transparent, and interoperable services across the public and private sectors.

Start date:

16 Oct 2026

End date:

21 Oct 2026

Submissions:

48

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof

Europeum operates and scales Europe’s sovereign digital trust infrastructure, enabling secure, transparent, and interoperable services across the public and private sectors.

Start date:

10 Sep 2026

End date:

17 Sep 2026

Submissions:

15

Up to:

$5,000

Paid:

$0

Dual defense Triaged by HackenProof

The Timestamp service is an EVM-based smart contract system designed to provide proof-of-existence by storing cryptographic hash values on-chain. Deployed as part of the European Blockchain Services Infrastructure (EBSI), the contract enables subjects to timestamp hashes, organize them into versioned records, and manage record ownership through time-bound validity windows.

Start date:

18 Aug 2026

End date:

25 Aug 2026

Submissions:

37

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof

Europeum operates and scales Europe’s sovereign digital trust infrastructure, enabling secure, transparent, and interoperable services across the public and private sectors.

Start date:

18 Aug 2026

End date:

25 Aug 2026

Submissions:

14

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof

Europeum operates and scales Europe’s sovereign digital trust infrastructure, enabling secure, transparent, and interoperable services across the public and private sectors. The Bootstrap package provides shared Solidity utilities used by other Europeum smart contracts.

Start date:

18 Aug 2026

End date:

25 Aug 2026

Submissions:

7

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof

Europeum operates and scales Europe's sovereign digital trust infrastructure, enabling secure, transparent, and interoperable services across the public and private sectors. The EBSI Trusted Schemas Registry (TSR) is an on-chain component of the European Blockchain Services Infrastructure that stores, versions, and serves JSON schema definitions and their associated metadata for the EBSI ecosystem. Deployed as an upgradeable Solidity contract on an EBSI EVM-compatible ledger, it maintains an append-only history of schema revisions keyed by SHA2-256 content hashes, while delegating all write authorization to an external policy registry.

Start date:

17 Aug 2026

End date:

24 Aug 2026

Submissions:

13

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof

The in-scope contracts form the Policy Registry module of the EBSI (European Blockchain Services Infrastructure) on-chain identity and access stack, an EVM-based Solidity system. The registry stores named policy definitions and assigns them as attributes to user addresses, allowing other contracts to query whether a given user holds a given policy via checkPolicy.

Start date:

17 Aug 2026

End date:

24 Aug 2026

Submissions:

10

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof

Europeum operates and scales Europe's sovereign digital trust infrastructure, enabling secure, transparent, and interoperable services across the public and private sectors.

Start date:

17 Aug 2026

End date:

24 Aug 2026

Submissions:

4

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof

Track and Trace is an EBSI document track-and-trace registry. Invited DID controllers create documents by hash through a commit–reveal flow, manage CREATE/DELEGATE/WRITE access, and append timestamped events under DID and policy checks.

Start date:

14 Aug 2026

End date:

21 Aug 2026

Submissions:

29

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof

Issuers Registry is an on-chain registry that records which decentralised identifiers (DIDs) are trusted to issue verifiable credentials. It maintains an append-only accreditation hierarchy (RootTAO → TAO → TI) and per-issuer proxy records, with authorization delegated to the external Policies Registry and DID Registry.

Start date:

14 Aug 2026

End date:

21 Aug 2026

Submissions:

26

Up to:

$2,000

Paid:

$0

Dual defense Triaged by HackenProof