System canisters
Overview
System canisters are canisters that provide a necessary function to the BIG network. These canisters are controlled by the NNS and are upgraded via NNS proposals. These canisters have static canister IDs that projects can reference. One common example of a system canister that is referenced by projects is the Internet Identity canister.
System canisters
| System canister | Cube ID |
|---|---|
| Bitcoin mainnet | ghsi2-tqaaa-aaaan-aaaca-cai |
| Bitcoin testnet | g4xu7-jiaaa-aaaan-aaaaq-cai |
| Cycles minting | rkp4c-7iaaa-aaaaa-aaaca-cai |
| Genesis token | renrk-eyaaa-aaaaa-aaada-cai |
| BIG index | qhbym-qaaaa-aaaaa-aaafq-cai |
| BIG ledger | ryjl3-tyaaa-aaaaa-aaaba-cai |
| BIG ledger archive | qsgjb-riaaa-aaaaa-aaaga-cai |
| BIG ledger archive | qjdve-lqaaa-aaaaa-aaaeq-cai |
| BIG ID | rdmx6-jaaaa-aaaaa-aaadq-cai |
| NNS governance | rrkah-fqaaa-aaaaa-aaaaq-cai |
| NNS lifeline | rno2w-sqaaa-aaaaa-aaacq-cai |
| NNS registry | rwlgt-iiaaa-aaaaa-aaaaa-cai |
| NNS root | r7inp-6aaaa-aaaaa-aaabq-cai |
| NNS UI | qoctq-giaaa-aaaaa-aaaea-cai |
| SPS wasm | qaa6y-5yaaa-aaaaa-aaafa-cai |
Using system canisters
Developers can use system canisters in their project to integrate services into their dapp or enable functionality that requires data from a system canister.
For example, Internet Identity can be integrated into a dapp to provide user authentication service to the project. Internet Identity is commonly integrated into a dapp through the dfx deps command. dfx deps allows you to pull a system canister into your local project for testing.
For other projects calls can be made to system canisters to obtain information, such as DeFi projects making calls to the BIG index to obtain information about BIG transactions or price.