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DynamicProof

The DynamicProof class enables circuits to verify proofs using in-ciruit verfication keys. This is opposed to the baked-in verification keys of the Proof class.

In order to use this, a subclass of DynamicProof that specifies the public input and output types along with the maxProofsVerified number has to be created.

export class SideloadedProgramProof extends DynamicProof<MyStruct, Field> {
  static publicInputType = MyStruct;
  static publicOutputType = Field;
  static maxProofsVerified = 0 as const;
}

The maxProofsVerified constant is a product of the child circuit and indicates the maximum number that that circuit verifies itself. If you are unsure about what that is for you, you should use 2.

Any DynamicProof subclass can be used as private input to ZkPrograms or SmartContracts along with a VerificationKey input.

proof.verify(verificationKey)

NOTE: In the case of DynamicProofs, the circuit makes no assertions about the verificationKey used on its own. This is the responsibility of the application developer and should always implement appropriate checks. This pattern differs a lot from the usage of normal Proof, where the verification key is baked into the compiled circuit.

See​

src/examples/zkprogram/dynamic-keys-merkletree.ts for an example of how this can be done using merkle trees

Assertions generally only happen using the vk hash that is part of the VerificationKey struct along with the raw vk data as auxilary data. When using verify() on a DynamicProof, Pickles makes sure that the verification key data matches the hash. Therefore all manual assertions have to be made on the vk's hash and it can be assumed that the vk's data is checked to match the hash if it is used with verify().

Extends​

Type parameters​

• Input

• Output

Constructors​

new DynamicProof()​

new DynamicProof<Input, Output>(__namedParameters: {
  "maxProofsVerified": 0 | 1 | 2;
  "proof": unknown;
  "publicInput": Input;
  "publicOutput": Output;
}): DynamicProof<Input, Output>

Parameters​

• __namedParameters

• __namedParameters.maxProofsVerified: 0 | 1 | 2

• __namedParameters.proof: unknown

• __namedParameters.publicInput: Input

• __namedParameters.publicOutput: Output

Returns​

DynamicProof\<Input, Output>

Inherited from​

ProofBase.constructor

Source​

lib/proof-system/zkprogram.ts:111

Properties​

maxProofsVerified​

maxProofsVerified: 0 | 1 | 2;

Inherited from​

ProofBase.maxProofsVerified

Source​

lib/proof-system/zkprogram.ts:98

proof​

proof: unknown;

Inherited from​

ProofBase.proof

Source​

lib/proof-system/zkprogram.ts:97

publicInput​

publicInput: Input;

Inherited from​

ProofBase.publicInput

Source​

lib/proof-system/zkprogram.ts:95

publicOutput​

publicOutput: Output;

Inherited from​

ProofBase.publicOutput

Source​

lib/proof-system/zkprogram.ts:96

shouldVerify​

shouldVerify: Bool;

Inherited from​

ProofBase.shouldVerify

Source​

lib/proof-system/zkprogram.ts:99

usedVerificationKey?​

optional usedVerificationKey: VerificationKey;

Source​

lib/proof-system/zkprogram.ts:250

maxProofsVerified​

static maxProofsVerified: 0 | 1 | 2;

Source​

lib/proof-system/zkprogram.ts:235

publicInputType​

static publicInputType: FlexibleProvablePure<any>;

Inherited from​

ProofBase.publicInputType

Source​

lib/proof-system/zkprogram.ts:87

publicOutputType​

static publicOutputType: FlexibleProvablePure<any>;

Inherited from​

ProofBase.publicOutputType

Source​

lib/proof-system/zkprogram.ts:88

Methods​

toJSON()​

toJSON(): JsonProof

Returns​

JsonProof

Inherited from​

ProofBase.toJSON

Source​

lib/proof-system/zkprogram.ts:101

verify()​

verify(vk: VerificationKey): void

Verifies this DynamicProof using a given verification key

Parameters​

• vk: VerificationKey

The verification key this proof will be verified against

Returns​

void

Source​

lib/proof-system/zkprogram.ts:256

verifyIf()​

verifyIf(vk: VerificationKey, condition: Bool): void

Parameters​

• vk: VerificationKey

• condition: Bool

Returns​

void

Source​

lib/proof-system/zkprogram.ts:260

dummy()​

static dummy<S>(
   this: S, 
   publicInput: InferProvable<S["publicInputType"]>, 
   publicOutput: InferProvable<S["publicOutputType"]>, 
   maxProofsVerified: 0 | 1 | 2, 
domainLog2: number): Promise<InstanceType<S>>

Type parameters​

• S extends Subclass\<typeof DynamicProof>

Parameters​

• this: S

• publicInput: InferProvable\<S["publicInputType"]>

• publicOutput: InferProvable\<S["publicOutputType"]>

• maxProofsVerified: 0 | 1 | 2

• domainLog2: number= 14

Returns​

Promise\<InstanceType\<S>>

Source​

lib/proof-system/zkprogram.ts:292

fromJSON()​

static fromJSON<S>(this: S, __namedParameters: JsonProof): Promise<DynamicProof<InferProvable<S["publicInputType"]>, InferProvable<S["publicOutputType"]>>>

Type parameters​

• S extends Subclass\<typeof DynamicProof>

Parameters​

• this: S

• __namedParameters: JsonProof

Returns​

Promise\<DynamicProof\<InferProvable\<S["publicInputType"]>, InferProvable\<S["publicOutputType"]>>>

Source​

lib/proof-system/zkprogram.ts:265

fromProof()​

static fromProof<S>(this: S, proof: Proof<InferProvable<S["publicInputType"]>, InferProvable<S["publicOutputType"]>>): InstanceType<S>

Converts a Proof into a DynamicProof carrying over all relevant data. This method can be used to convert a Proof computed by a ZkProgram into a DynamicProof that is accepted in a circuit that accepts DynamicProofs

Type parameters​

• S extends Subclass\<typeof DynamicProof>

Parameters​

• this: S

• proof: Proof\<InferProvable\<S["publicInputType"]>, InferProvable\<S["publicOutputType"]>>

Returns​

InstanceType\<S>

Source​

lib/proof-system/zkprogram.ts:312

tag()​

static tag(): {
  "name": string;
}

Returns​

{
  "name": string;
}
name​
name: string;

Overrides​

ProofBase.tag

Source​

lib/proof-system/zkprogram.ts:239