ranDOmn-iexec

iExec decentralized oracle for aggregating two random number generator APIs and providing up to 256 random uint numbers.

Data sources

ANU QNRG: Random numbers generated in real-time by measuring the quantum fluctuations of the vacuum.

CSNRG: NIST Certified random number generator.

Note: services provided by these sources do not require a dedicated API key.

Aggregation algorithm

get 256 QNRG random uint8 numbers rqnrg
get 1 CSNRG random uint8 number rcsnrg
for n requested numbers :
    add rqnrg at index rcsnrg to output list
    set index at next position
return output list

IO

input :

• The requested count of uint8 random numbers - a number between 1 and 256 (default is 1).

example: 10

output :

• An ABI encoded bytes representation of an array of random numbers

example: Encoded result of [55, 85, 119, 15, 152, 32, 104, 205, 19, 36] is 0x000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000003700000000000000000000000000000000000000000000000000000000000000550000000000000000000000000000000000000000000000000000000000000077000000000000000000000000000000000000000000000000000000000000000f00000000000000000000000000000000000000000000000000000000000000980000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000006800000000000000000000000000000000000000000000000000000000000000cd00000000000000000000000000000000000000000000000000000000000000130000000000000000000000000000000000000000000000000000000000000024

Running locally

Build the docker image :

docker image build -t randomn-iexec .

Run the docker image, only the output folder path is needed

docker run --rm -it -v $(pwd):/iexec_out -e IEXEC_OUT=/iexec_out randomn-iexec 10

the computed.json file contains the callback data that is used by the oracle.

Deploying and running on iExec

If this is your first time using iExec, we recommend you to first follow the iExec official quickstart guide.

If you're familiar with iExec, run the sconify.sh script to transform the docker application into a TEE mode, then deploy as a trusted application.

When launching an execution, you will have to specify the contract address for the callback data, you will find n example below :

iexec app run --tag tee --workerpool 0xe6806E69BA8650AF23264702ddD43C4DCe35CcCe --watch --callback 0x0C22D575B783CE85322533f11334855dD24Ef936 --chain viviani --args "5"

--workerpol is passed here only to specify a debug worker pool --callback is the deployed smart contract address that will process the data

In he contracts folder, you will find the smart contract code that corresponds to 0x0C22D575B783CE85322533f11334855dD24Ef936