diff --git a/src/kzg10.rs b/src/kzg10.rs
index c62f285..13d7a83 100644
--- a/src/kzg10.rs
+++ b/src/kzg10.rs
@@ -1,15 +1,15 @@
 use ark_poly::univariate::DensePolynomial;
-use ark_poly::{DenseUVPolynomial, EvaluationDomain, GeneralEvaluationDomain};
+use ark_poly::DenseUVPolynomial;
 use ark_poly_commit::{
     LabeledPolynomial,
 };
 use ark_std::test_rng;
-use anyhow::{anyhow, Result};
+use anyhow::Result;
 use ark_bls12_381::Bls12_381;
 use ark_ec::pairing::Pairing;
 use ark_ec::{AffineRepr, CurveGroup};
 use ark_ff::{PrimeField, Zero};
-use crate::traits::{CommitOutputTrait, PolyCommScheme, SRSTrait};
+use crate::traits::{CommitOutputTrait, PolyCommScheme};
 use ark_poly_commit::kzg10::{KZG10, Proof, UniversalParams, Powers, VerifierKey, Commitment, Randomness};
 
 pub type E = Bls12_381;
@@ -17,31 +17,7 @@ pub type F = <E as Pairing>::ScalarField;
 pub type UniPoly381 = DensePolynomial<F>;
 pub type PCS = KZG10<E, UniPoly381>;
 
-pub struct KZG10SRS {
-    pub poly_domain: GeneralEvaluationDomain<F>,
-    pub pp: UniversalParams<E>
-}
-
-impl SRSTrait<F> for KZG10SRS{
-    type PP = UniversalParams<E>;
-    type Domain = GeneralEvaluationDomain<F>;
-
-    fn get_pp(&self) -> &Self::PP {
-        &self.pp
-    }
-
-    fn get_domain(&self) -> &Self::Domain {
-        &self.poly_domain
-    }
-
-    fn get_domain_element(&self, idx:usize) -> F {
-        self.poly_domain.element(idx)
-    }
-
-    fn get_domain_size(&self) -> usize{
-        self.poly_domain.size()
-    }
-}
+pub type KZG10SRS = UniversalParams<E>;
 
 pub struct KZG10PolyComm {}
 
@@ -86,7 +62,7 @@ impl CommitOutputTrait for KZG10CommitOutput {
 
 impl KZG10PolyComm{
     fn commit_single(srs: &KZG10SRS, input: F, index: usize) -> Result<Commitment<E>> {
-        let power = &srs.pp.powers_of_g[index];
+        let power = &srs.powers_of_g[index];
 
         let c = power.mul_bigint(input.into_bigint());
 
@@ -106,17 +82,13 @@ impl PolyCommScheme<F> for KZG10PolyComm {
     fn setup(degree: usize) -> Result<Self::SRS> {
         let rng = &mut test_rng();
         let pp = PCS::setup(degree,false, rng)?;
-        let poly_domain = EvaluationDomain::<F>::new(degree).ok_or(anyhow!("polycommit domain error"))?;
-        Ok(KZG10SRS {
-            poly_domain,
-            pp,
-        })
+        Ok(pp)
     }
 
     fn commit(srs: &Self::SRS, input: Vec<F>) -> Result<Self::CommitOutput> {
         let rng = &mut test_rng();
-        let degree = srs.poly_domain.size();
-        let powers = get_powers(&srs.pp, degree)?;
+        let degree = input.len();
+        let powers = get_powers(&srs, degree)?;
 
         // input are poly coeffs
         let input_poly = DensePolynomial::<F>::from_coefficients_vec(input);
@@ -165,8 +137,8 @@ impl PolyCommScheme<F> for KZG10PolyComm {
     ) -> Result<Self::Proof> {
 
         // powers from the srs
-        let m = srs.poly_domain.size();
-        let powers= get_powers(&srs.pp, m)?;
+        let m = srs.powers_of_g.len();
+        let powers= get_powers(&srs, m)?;
 
         // get row poly and rand
         let poly     = &comm.poly;
diff --git a/src/matrix_commit.rs b/src/matrix_commit.rs
index d2c418f..83af65e 100644
--- a/src/matrix_commit.rs
+++ b/src/matrix_commit.rs
@@ -2,7 +2,7 @@ use std::marker::PhantomData;
 use anyhow::Result;
 use ark_ff::Field;
 use crate::field_matrix::Matrix;
-use crate::traits::{MatrixPolyCommScheme, DataMatrix, PolyCommScheme, SRSTrait, MatrixCommitOutput};
+use crate::traits::{MatrixPolyCommScheme, DataMatrix, PolyCommScheme, MatrixCommitOutput};
 
 
 pub struct MatrixPolyComm<F, P: PolyCommScheme<F>> {
@@ -44,7 +44,6 @@ impl<F: Field + Clone, P: PolyCommScheme<F>> MatrixPolyCommScheme<F, P> for Matr
     ) -> Result<()> {
         // check input is consistent
         assert_eq!(old_col.len(), new_col.len(), "col sizes don't match");
-        assert_eq!(srs.get_domain_size(), new_col.len(), "domain size is incorrect");
 
         // loop through all new_col elements to see if there is an update at each cell
         // if there is, then update the commitment
@@ -57,9 +56,7 @@ impl<F: Field + Clone, P: PolyCommScheme<F>> MatrixPolyCommScheme<F, P> for Matr
         Ok(())
     }
 
-    fn open(comm: &MatrixCommitOutput<F, P>, srs: &P::SRS, row: usize, col: usize) -> Result<P::Proof> {
-        // the point we want to open
-        let point = srs.get_domain_element(col);
+    fn open(comm: &MatrixCommitOutput<F, P>, srs: &P::SRS, row: usize, point: F) -> Result<P::Proof> {
 
         let proof = P::open(&comm.comm_output[row], srs, point)?;
 
diff --git a/src/traits.rs b/src/traits.rs
index bb9e3ce..ba82cce 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -39,21 +39,21 @@ pub trait CommitOutputTrait {
     fn get_rand(&self) -> &Self::Rand;
 }
 
-pub trait SRSTrait<F>{
-    // public/universal params
-    type PP;
-    // domain type
-    type Domain;
-
-    fn get_pp(&self) -> &Self::PP;
-    fn get_domain(&self) -> &Self::Domain;
-    fn get_domain_element(&self, idx: usize) -> F;
-    fn get_domain_size(&self) -> usize;
-}
+// pub trait SRSTrait<F>{
+//     // public/universal params
+//     type PP;
+//     // domain type
+//     type Domain;
+//
+//     fn get_pp(&self) -> &Self::PP;
+//     fn get_domain(&self) -> &Self::Domain;
+//     fn get_domain_element(&self, idx: usize) -> F;
+//     fn get_domain_size(&self) -> usize;
+// }
 
 /// Polynomial Commitment scheme (e.g. KZG) trait
 pub trait PolyCommScheme<F>{
-    type SRS: SRSTrait<F>;
+    type SRS;
     type VK;
     type CommitOutput: CommitOutputTrait;
     type Comm;
@@ -95,7 +95,7 @@ pub trait MatrixPolyCommScheme<F, P:PolyCommScheme<F>>{
         comm: &MatrixCommitOutput<F, P>,
         srs: &P::SRS,
         row: usize,
-        col: usize,
+        point: F,
     ) -> Result<P::Proof>;
     fn verify(
         vk:   &P::VK,