a.sagynbaev 

Production-ready .NET library for Zero-Knowledge Proofs with real Bulletproofs on secp256k1 implemented from scratch in pure C#. Features Pedersen commitments, inner product arguments, Fiat-Shamir transcripts,... More information

Core models and interfaces for Tessera identity infrastructure: DID, attestations, presentations. No crypto, no chain dependencies.

Generic, type-tagged attestations: issuer signing, canonical serialization, Merkle bundling, presentation verification.

Secp256k1 field/group arithmetic, Pedersen commitments, and Bulletproofs range proofs. Pure C#, no external dependencies.

Layer-2 plugin: maps a Sumsub KYC result to Tessera AttestationDrafts (kyc_verified, jurisdiction). Implements IAttestationSource; depends only on the core.

Layer-2 plugin: maps government-registry lookups over X-Road to Tessera AttestationDrafts (jurisdiction/residency, property_right, encumbrance). Implements IAttestationSource; depends only on the core.

Chain-agnostic interfaces for anchoring attestation roots and revocation state. Implemented by Tessera.Chains.Solana and Tessera.Chains.Stellar.

DID document creation, wallet binding, signature verification, revocation. Off-chain. Storage-agnostic via IDidStore.

Solana implementation of IChainAnchor. Drives the chains/solana/programs/identity-registry Anchor program via Solnet.

High-level facades for Tessera: Holder, Issuer, Verifier. The entry point most consumers should use.

Stellar/Soroban implementation of IChainAnchor. Anchors attestation roots and revocation epochs via a Soroban contract.

EF Core implementations of IDidStore and IIssuerRegistry. Provider-agnostic (relational only) — consumer chooses Npgsql/SqlServer/Sqlite at composition root.

Generic EVM implementation of IChainAnchor. Drives the chains/evm IdentityRegistry contract via Nethereum on any EVM network (chainId/RPC are configuration).

Off-chain channel binding: HKDF-based commitments over phone numbers, email, Telegram handles. Pepper held outside the library (KMS / Key Vault). Used to bind low-entropy identifiers to a DID without storing... More information

Production Ed25519 signing/verification for Tessera. Wraps NSec.Cryptography (libsodium) and implements ISignatureVerifier and IIssuerSigner so consumers do not need to bring their own crypto.

Privacy-preserving identity and reputation infrastructure for .NET. DIDs, attestations, selective disclosure via Merkle bundles, and Bulletproof predicate proofs over committed values. v3 meta-package —... More information

Layer-2 plugin: turns proven control of Bitcoin addresses (BIP-137 signed challenge) into Tessera AttestationDrafts — btc_control (address count only), btc_balance and btc_hodl_age (Pedersen-committed). Esplora... More information

Cardano adapter implementing IChainAnchor: anchors Merkle attestation roots and revocation epochs on Cardano (preprod) via Aiken / Plutus V3 validators (Validator mode) or transaction metadata (Metadata mode).... More information

Midnight implementation of IChainAnchor — scaffold. The Compact contract and transaction layer are pending; reads return "no anchor" and writes throw NotSupported. See the package README.