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On this page
  • Secret VRF (Verifiable Random Function)
  • Getting Started
  • Requesting Randomness
  • Conclusion

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  1. Confidential Computing Layer
  2. IBC Developer Toolkit
  3. Usecases

Secret VRF for IBC with IBC-Hooks

Verifiable on-chain random number generator for the entire Cosmos.

PreviousKey-Value store Developer TutorialNextConfidential Voting

Last updated 7 months ago

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Secret VRF (Verifiable Random Function)

This VRF tutorial uses IBC Hooks, as introduced in . If your chain is on a previous IBC version, see the SecretVRF tutorial using proxy contracts .

Secret VRF is a provably fair and verifiable on-chain random number generator (RNG) that enables smart contracts to access random values without compromising security or usability. Coupled with cross-chain interoperable smart contracts using , Secret Network enables developers and projects across the Cosmos access to state-of-the-art on-chain RNG.

Use Secret VRF to build reliable smart contracts for any application that relies on unpredictable outcomes:

  • NFT Minting: Utilize randomness for features like unordered minting, trait randomization, and identity numbering, enhancing the authenticity and security of NFT collections.

  • Web3 Gaming: Apply randomness in gambling, damage calculation, loot boxes, and boss drops to build trust among players by ensuring fairness and preventing any player from having an unfair advantage.

  • DAO Operations: Employ randomness for wallet initialization, task assigning, unordered voting/liquidations, and order book ordering, facilitating equitable and secure decentralized governance and operations.

Learn more about how SecretVRF works in-depth .

Getting Started

To use SecretVRF on any IBC-enabled chain with IBC hooks, all that is required is:

  1. An IBC transfer channel between Secret Network and the consumer chain that receives randomness.

  2. Uploading the RNG Consumer Contract to your chain and directing it to your chain's transfer channel

You can look up existing transfer channels between Secret Network on a block explorer such as Ping or .

Requesting Randomness

Git clone the IBC hooks randomness repository:

git clone https://github.com/SecretFoundation/ibchooks-secretVRF.git
//Juno
const SECRET_TRANSFER_CHANNEL_ID: &str = "channel-8";
const CHAIN_TRANSFER_CHANNEL_ID: &str = "channel-48";

For this example, we request randomness on Juno Mainnet, but you can request randomness on any IBC-compatible chain that has a transfer channel established with Secret Network.

Once you have updated the transfer channels, compile the contract:

make build-mainnet-reproducible

Upload the compiled contract:

junod tx wasm store consumer-side/artifacts/secret_ibc_rng_consumer_side_proxy.wasm --from <your-wallet> --chain-id juno-1 --node https://rpc.juno.chaintools.tech:443 --gas 1200000 --gas-prices 0.075ujuno
{"key":"code_id","value":"4210"}]}]}]"

Instantiate the contract with the returned code_id:

junod tx wasm instantiate 4210 '{}' --label RNG-IBC-JUNO --no-admin --from <your-wallet> --chain-id juno-1 --node https://rpc.juno.chaintools.tech:443 --gas 200000 --gas-prices 0.075ujuno
[{"key":"_contract_address","value":"juno1srwcjsaslt9ewujg6wcpcwv08lsrsn6rx6ja5mqx4qngqjh8cugqt73c8m"},

Now that you've instantiated your randomness contract, all that's left is to request randomness! Simply execute request_random:

junod tx wasm execute "juno1srwcjsaslt9ewujg6wcpcwv08lsrsn6rx6ja5mqx4qngqjh8cugqt73c8m" '{"request_random":{"job_id":"1"}}' --from <your-wallet> --chain-id juno-1 --node https://rpc.juno.chaintools.tech:443 --gas 200000 --gas-prices 0.075ujuno --amount 1ujuno

A transaction hash will be returned:

txhash: 92D5BDA1344529B58EAD5A0068A807632F46BCCCF05CF10E67211F9CBBD2A74B

You can update the job_id string to any string of your choosing

And then view the magic of cross-chain randomness with IBC hooks 😍:

{"amount":"1","denom":"transfer/channel-8/ujuno","memo":"{\"wasm\": {\"contract\": \"juno1srwcjsaslt9ewujg6wcpcwv08lsrsn6rx6ja5mqx4qngqjh8cugqt73c8m\", \"msg\": {\"receive_random\": {\"job_id\": \"1\", \"randomness\": \"bjFHP7rrLwP4f6fpGpeTt5+N1zPiTO+y7da7RI9kHzk=\", \"signature\": \"y+Kwu0T2gwRwDZGCdDPzGrm6hE2S2UZF1e1jm47pv85pdRdP7HdOfl6T+VKfAE4hPxSWJ5LBcTSNZ+b0KTe0xQ==\"}}}}","receiver":"juno1srwcjsaslt9ewujg6wcpcwv08lsrsn6rx6ja5mqx4qngqjh8cugqt73c8m","sender":"secret1up0mymn4993hgn7zpzu4je34w0n5s7l0mem7rk"}

Congrats! You've just sent a verifiable on-chain random byte with SecretVRF πŸ™Œ.

Conclusion

Secret VRF revolutionizes blockchain applications by providing a secure and verifiable source of randomness, critical for fairness in NFT minting, gaming, and DAO operations. Its seamless integration with IBC hooks enables cross-chain interoperability, allowing developers across the Cosmos ecosystem to build more reliable and elegant smart contracts.

Update the and the to the channel-id for your IBC-enabled chain:

Upon successful , a code_id is returned:

Upon succesful , a contract_address is returned:

Navigate to the recently for your contract:

If you have any questions, join our and a Secret developer will assist you ASAP.

πŸ”“
πŸ§‘β€πŸš€
SECRET_TRANSFER_CHANNEL_ID
CHAIN_TRANSFER_CHANNEL_ID
upload
instantiation
received transactions
discord
IBC v3.4.0
here
IBC hooks
here
here
here
Existing IBC connections with Secret Network