diff --git a/.vscode/settings.json b/.vscode/settings.json
index 95d849e..ddedc50 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -11,6 +11,9 @@
   // https://raw.githubusercontent.com/PKief/vscode-material-icon-theme/main/images/fileIcons.png
   "material-icon-theme.files.associations": {
     "*.circom": "Verilog",
-    "*.wtns": "Authors"
+    "*.wtns": "Authors",
+    "*.zkey": "Lock",
+    "*.r1cs": "Diff",
+    "*.sym": "Edge"
   }
 }
diff --git a/circomkit.json b/circomkit.json
index 24e65ac..8b56114 100644
--- a/circomkit.json
+++ b/circomkit.json
@@ -1,4 +1,6 @@
 {
   "version": "2.1.4",
-  "verbose": true
+  "verbose": true,
+  "prime": "bn128",
+  "protocol": "groth16"
 }
diff --git a/circuits.json b/circuits.json
index 9723f1c..a0c95d0 100644
--- a/circuits.json
+++ b/circuits.json
@@ -3,5 +3,11 @@
     "file": "multiplier",
     "template": "Multiplier",
     "params": [3]
+  },
+  "someArrays_2_3": {
+    "file": "someArrays",
+    "template": "SomeArrays",
+    "params": [2, 3],
+    "pubs": ["in1D", "in2D"]
   }
 }
diff --git a/circuits/main/someArrays_2_3.circom b/circuits/main/someArrays_2_3.circom
new file mode 100644
index 0000000..ac61a22
--- /dev/null
+++ b/circuits/main/someArrays_2_3.circom
@@ -0,0 +1,6 @@
+// auto-generated by circomkit
+pragma circom 2.1.4;
+
+include "../someArrays.circom";
+
+component main {public[in1D, in2D]} = SomeArrays(2, 3);
diff --git a/circuits/someArrays.circom b/circuits/someArrays.circom
new file mode 100644
index 0000000..5f440ce
--- /dev/null
+++ b/circuits/someArrays.circom
@@ -0,0 +1,20 @@
+pragma circom 2.0.0;
+
+template SomeArrays(N, M) {
+  signal input in; 
+  signal input in1D[N]; 
+  signal input in2D[N][M]; 
+
+  in === 1;
+  for (var i = 1; i < N; i++) {
+    in1D[i-1] + 1 === in1D[i];
+  }
+
+  for (var i = 0; i < N; i++) {
+    for (var j = 1; j < M; j++) {
+      in2D[i][j-1] + 1 === in2D[i][j];
+    }
+  }
+
+  log(1, N, N + M);
+}
diff --git a/inputs/someArrays_2_3/default.json b/inputs/someArrays_2_3/default.json
new file mode 100644
index 0000000..e9318f5
--- /dev/null
+++ b/inputs/someArrays_2_3/default.json
@@ -0,0 +1,9 @@
+{
+  "in": 1,
+  "in1D": [2, 3],
+  "in2D": [
+    [4, 5],
+    [6, 7],
+    [8, 9]
+  ]
+}
diff --git a/src/circomkit.ts b/src/circomkit.ts
index 1c1a565..aaf91f0 100644
--- a/src/circomkit.ts
+++ b/src/circomkit.ts
@@ -19,7 +19,7 @@ import type {
 } from './types/';
 import {WitnessTester, ProofTester} from './testers/';
 import {prettyStringify, primeToName} from './utils';
-import {defaultConfig, colors, CURVES, PROTOCOLS} from './utils/config';
+import {defaultConfig, colors, PRIMES, PROTOCOLS} from './utils/config';
 
 /**
  * Circomkit is an opinionated wrapper around many SnarkJS functions.
@@ -59,7 +59,7 @@ export class Circomkit {
     this.snarkjsLogger = this.config.verbose ? this.logger : undefined;
 
     // sanity checks
-    if (!CURVES.includes(this.config.prime)) {
+    if (!PRIMES.includes(this.config.prime)) {
       throw new Error('Invalid prime in configuration.');
     }
     if (!PROTOCOLS.includes(this.config.protocol)) {
@@ -297,14 +297,16 @@ export class Circomkit {
     if (this.config.protocol === 'fflonk') {
       throw new Error('Exporting calldata is not supported for fflonk yet.');
     }
-    const [pubs, proof] = (
-      await Promise.all(
-        (['pubs', 'proof'] as const)
-          .map(type => this.pathWithInput(circuit, input, type))
-          .map(path => readFile(path, 'utf-8'))
-      )
-    ).map(content => JSON.parse(content));
-    return await snarkjs[this.config.protocol].exportSolidityCallData(proof, pubs);
+
+    const pubs: snarkjs.PublicSignals = JSON.parse(await readFile(this.pathWithInput(circuit, input, 'pubs'), 'utf-8'));
+    const proof: snarkjs.Groth16Proof & snarkjs.PlonkProof & snarkjs.FflonkProof = JSON.parse(
+      await readFile(this.pathWithInput(circuit, input, 'proof'), 'utf-8')
+    );
+    // TODO: we can write this ourselves by simply parsing the proof object, now that we know its type!
+    // this way, we may be able to fix the calldata issue as well for fflonk
+    const res = await snarkjs[this.config.protocol].exportSolidityCallData(proof, pubs);
+    // prettyCalldata(this.config.protocol, res);
+    return res;
   }
 
   /** Instantiate the `main` component.
diff --git a/src/types/circomkit.ts b/src/types/circomkit.ts
index 1335654..d86f2b6 100644
--- a/src/types/circomkit.ts
+++ b/src/types/circomkit.ts
@@ -1,10 +1,18 @@
 import type {LogLevelDesc} from 'loglevel';
 
+/**
+ * Primes supported by Circom, as described for the `-p` option.
+ * @see https://github.com/iden3/circom/blob/master/program_structure/src/utils/constants.rs
+ */
+export type CircomkitPrimes = 'bn128' | 'bls12381' | 'goldilocks' | 'grumpkin' | 'pallas' | 'vesta' | 'secq256r1';
+
+export type CircomkitProtocol = 'groth16' | 'plonk' | 'fflonk';
+
 export type CircomkitConfig = {
   /** Protocol to be used. */
-  protocol: 'groth16' | 'plonk' | 'fflonk';
+  protocol: CircomkitProtocol;
   /** Underlying prime field. */
-  prime: 'bn128' | 'bls12381' | 'goldilocks';
+  prime: CircomkitPrimes;
   /** Circuit configurations path. */
   circuits: string;
   /** Directory to read circuits from. */
@@ -39,6 +47,8 @@ export type CircomkitConfig = {
   logLevel: LogLevelDesc;
   /** Whether to generate the C witness calculator. */
   cWitness: boolean;
+  /** Whether to print Solidity copy-pasteable calldata. */
+  prettyCalldata: false;
 };
 
 /** Shorthand notations for which path to build in Circomkit. These paths require a circuit name. */
diff --git a/src/utils/calldata.ts b/src/utils/calldata.ts
new file mode 100644
index 0000000..26a9355
--- /dev/null
+++ b/src/utils/calldata.ts
@@ -0,0 +1,14 @@
+// import {CircomkitProtocol} from '../types';
+
+// /**
+//  * Prettifies the calldata.
+//  *
+//  * Since calldata always has the public signals at the end, and no matter the dimensions of those signals
+//  * they always get flattened to a 1D array, we can find the start of public signals at the last `[`.
+//  *
+//  * @param protocol protocol
+//  * @param calldata exported calldata string
+//  */
+// export function prettyCalldata(protocol: CircomkitProtocol, calldata: string) {
+//   // TODO: implement
+// }
diff --git a/src/utils/config.ts b/src/utils/config.ts
index 11fdd76..b378567 100644
--- a/src/utils/config.ts
+++ b/src/utils/config.ts
@@ -2,7 +2,7 @@ import type {LogLevelNames} from 'loglevel';
 import type {CircomkitConfig} from '../types/';
 
 export const PROTOCOLS = ['groth16', 'plonk', 'fflonk'] as const;
-export const CURVES = ['bn128', 'bls12381', 'goldilocks'] as const;
+export const PRIMES = ['bn128', 'bls12381', 'goldilocks', 'grumpkin', 'pallas', 'vesta', 'secq256r1'] as const;
 
 /** Default configurations */
 export const defaultConfig: Readonly<CircomkitConfig> = Object.seal({
@@ -24,6 +24,8 @@ export const defaultConfig: Readonly<CircomkitConfig> = Object.seal({
   // groth16 phase-2 settings
   groth16numContributions: 1,
   groth16askForEntropy: false,
+  // solidity & calldata
+  prettyCalldata: false,
   // logger
   logLevel: 'INFO',
   verbose: true,
diff --git a/src/utils/index.ts b/src/utils/index.ts
index ef6b7ed..b0cbaff 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -5,13 +5,21 @@ export const primes: Record<CircomkitConfig['prime'], bigint> = {
   bn128: 21888242871839275222246405745257275088548364400416034343698204186575808495617n,
   bls12381: 52435875175126190479447740508185965837690552500527637822603658699938581184513n,
   goldilocks: 18446744069414584321n,
-};
+  grumpkin: 21888242871839275222246405745257275088696311157297823662689037894645226208583n,
+  pallas: 28948022309329048855892746252171976963363056481941560715954676764349967630337n,
+  vesta: 28948022309329048855892746252171976963363056481941647379679742748393362948097n,
+  secq256r1: 115792089210356248762697446949407573530086143415290314195533631308867097853951n,
+} as const;
 
 /** A mapping from prime (decimals) to prime name as supported by Circom's `-p` option. */
 export const primeToName: Record<`${bigint}`, CircomkitConfig['prime']> = {
   '21888242871839275222246405745257275088548364400416034343698204186575808495617': 'bn128',
   '52435875175126190479447740508185965837690552500527637822603658699938581184513': 'bls12381',
   '18446744069414584321': 'goldilocks',
+  '21888242871839275222246405745257275088696311157297823662689037894645226208583': 'grumpkin',
+  '28948022309329048855892746252171976963363056481941560715954676764349967630337': 'pallas',
+  '28948022309329048855892746252171976963363056481941647379679742748393362948097': 'vesta',
+  '115792089210356248762697446949407573530086143415290314195533631308867097853951': 'secq256r1',
 } as const;
 
 /** JSON Stringify with a prettier format. */