fix: vkey hash (#10)

README.md

@@ -68,8 +68,16 @@ run_verify_instruction(groth16_proof).await;
 
 3. Using the [`solana-program-test`](https://docs.rs/solana-program-test/latest/solana_program_test/) framework, send the `SP1Groth16Proof` to the 
 [`fibonacci-verifier-contract`](./example/program). This smart contract will verify the proof using the `sp1-solana`
-crate against the fibonacci SP1 program vkey and print out the public inputs. Here is a snippet that demonstrates
-how to perform the verification and read the public inputs on chain. 
+crate against the fibonacci SP1 program vkey and print out the public inputs. 
+
+> [!NOTE]
+> In this example, a Groth16 proof and public values are directly passed into the contract as transaction data. 
+> In real use cases, this may not be reasonable, since the upper limit for transaction data is 1232 bytes.
+> Groth16 proofs themselves are already 260 bytes, and public inputs can potentially be very large. 
+> See [this article](https://solana.com/developers/courses/program-optimization/lookup-tables) for a discussion
+> on how to handle this.
+
+Here is a snippet that demonstrates how to perform the verification and read the public inputs on chain. 
 
 ```rust
 // Derived by running `vk.bytes32()` on the program's vkey.

example/program/src/lib.rs

@@ -20,7 +20,7 @@ entrypoint!(process_instruction);
 /// let vkey_hash = vk.bytes32();
 /// ```
 const FIBONACCI_VKEY_HASH: &str =
-    "0x0083e8e370d7f0d1c463337f76c9a60b62ad7cc54c89329107c92c1e62097872";
+    "0x0054c0e58911dd8b993c6d8f249aa50a2e523114ec4b7ef9dd355c5f6bfbf3ce";
 
 /// The instruction data for the program.
 #[derive(BorshDeserialize, BorshSerialize)]