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Add native implementation of Schnorr blind signatures and non-blind Schnorr signatures: https://eprint.iacr.org/2019/877
ark-ec-blind-signatures

Blind signatures over elliptic curve implementation (native & r1cs constraints) using arkworks.
Blind signature over elliptic curves, based on "New Blind Signature Schemes Based on the (Elliptic Curve) Discrete Logarithm Problem" paper by Hamid Mala & Nafiseh Nezhadansari.
Warning: experimental code, do not use in production.
Target: Groth16 over Bn254 (for Ethereum), ed-on-bn254 (BabyJubJub) for the signatures.
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