zkas: Rename "contract" to "witness".

proof/arithmetic.zk

@@ -1,6 +1,6 @@
 constant "Arith" {}
 
-contract "Arith" {
+witness "Arith" {
     Base a,
     Base b,
 }

proof/burn.zk

@@ -4,7 +4,7 @@ constant "Burn" {
 	EcFixedPointBase NULLIFIER_K,
 }
 
-contract "Burn" {
+witness "Burn" {
 	Base secret,
 	Base serial,
 	Base value,

proof/deploy_contract.zk

@@ -2,7 +2,7 @@ constant "DeployContract" {
 	EcFixedPointBase NULLIFIER_K,
 }
 
-contract "DeployContract" {
+witness "DeployContract" {
 	# Amount of bytes to store on-chain
 	Base bytes,
 	# Deploy key used for signing and contract reference

proof/encrypt.zk

@@ -7,7 +7,7 @@
 
 constant "Encrypt" {}
 
-contract "Encrypt" {
+witness "Encrypt" {
     # We are encrypting values to this public key
     EcNiPoint pubkey,
 

proof/inclusion_proof.zk

@@ -1,7 +1,7 @@
 constant "InclusionProof" {
 }
 
-contract "InclusionProof" {
+witness "InclusionProof" {
 	Base leaf,
 	Uint32 leaf_pos,
 	MerklePath path,

proof/lead.zk

@@ -4,7 +4,7 @@ constant "Lead" {
          EcFixedPointBase NULLIFIER_K,
 }
 
-contract "Lead" {
+witness "Lead" {
          MerklePath c1_cm_path,
          Uint32 c1_cm_pos,
          Uint32 c1_sk_pos,

proof/mint.zk

@@ -4,7 +4,7 @@ constant "Mint" {
 	EcFixedPointBase NULLIFIER_K,
 }
 
-contract "Mint" {
+witness "Mint" {
 	Base pub_x,
 	Base pub_y,
 	Base value,

proof/opcodes.zk

@@ -4,7 +4,7 @@ constant "Opcodes" {
 	EcFixedPointBase NULLIFIER_K,
 }
 
-contract "Opcodes" {
+witness "Opcodes" {
 	Base value,
 	Scalar value_blind,
 

proof/tx.zk

@@ -4,7 +4,7 @@ constant "tx" {
          EcFixedPointBase NULLIFIER_K,
 }
 
-contract "tx" {
+witness "tx" {
          # coin (1) witnesses
          Base root,
          Base c1_root_sk,

proof/voting.zk

@@ -4,7 +4,7 @@ constant "Vote" {
 	EcFixedPointBase NULLIFIER_K,
 }
 
-contract "Vote" {
+witness "Vote" {
 	Base process_id_0,
 	Base process_id_1,
 	Base secret_key,