===Ledger canister===
This is the canister that holds the ICP token balances: https://github.com/dfinity/ic/tree/maste
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There are two options to top up any canister: By depositing cycles, or by converting ICP to cycles directly.
...you can take any amount of cycles from it and deposit them directly into a canister. To do so, use
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#REDIRECT [[Canister smart contract]]
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...uter.org/docs/current/developer-docs/smart-contracts/overview/introduction canister smart contracts]
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...e the state of a canister, and queries, which cannot modify the state of a canister.'''
...call-backs to register what needs to be done with the result of any inter-canister messages it issues.
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The example walks through a scenario of charging cycles that includes inter-canister calls and how the performance counter relates to the work done by canisters
# The ''User'' sends an 1KiB ''Ingress Message'' to ''Canister A''
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A '''principal''' is an identifier for an entity on the IC such as a user, a canister (dapps/smart contracts), or a subnet.
...pal associated with a call is a value that identifies a ''unique'' user or canister.
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...akes it possible for canisters to perform the same kind of checks. The KYT canister is used by the [https://github.com/dfinity/ic/tree/master/rs/bitcoin/ckbtc/
...retrieve bitcoins, the ckBTC minter issues a KYT check request to the KYT canister whose response contains alerts, if any, for the provided output or address.
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...tries to run longer that this limit, the function call is aborted and the canister state is rolled back to the state before the function call. When this happe
Error: The Replica returned an error: code 5, message: "Canister <canisterid> exceeded the cycles limit for single message execution."
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...tes from the exchange rate canister, which is our price oracle. The cycles canister also stores the start-of-day rates (UTC).
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===Canister===
* https://dashboard.internetcomputer.org/canister/rdmx6-jaaaa-aaaaa-aaadq-cai
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=="Canister Sandboxing Review" by Trail of Bits==
...nister-sandbox-review-by-trail-of-bits-third-party-security-audit-4/15951 "Canister Sandboxing" by Trail of Bits]
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...m the response of the first command to transfer tokens and notify the swap canister. The syntax is as follows
--canister-ids-file <SNS_CANISTER_IDS_FILE> \
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...isters and an index canister, a root canister, and a decentralization swap canister that is explained in the next section.
The ''ledger canister'' implements the [https://github.com/dfinity/ICRC-1 ICRC-1 standard] and co
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===Reverse Gas Model (AKA "canister pays")===
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...cause <code><fill in reason></code>. Currently this subnet is assigned the canister ID ranges <code><fill in ranges; in both representations></code>. Ranges ar
...n should properly handle these errors. In case you are unsure whether your canister properly handles these transient errors you might want to consider stopping
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If there is a bug in your pre_upgrade hook that causes it to panic, then the canister can no longer be upgraded. This is because the pre_upgrade hook is part of
...on how long the upgrade process can run for. So it is possible that if the canister has too much state or the [de]serialising logic is not very efficient, then
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* [[Comparing Canister Cycles vs Performance Counter]]
...]. Topics there include things such as help with SDK installation, Motoko, canister troubleshooting, and designs.
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The SNS governance canister stores all the initial parameters that were provided to SNS-W when the SNS
<syntaxhighlight>$ dfx canister --network ic call <GOVERNANCE_CANISTER_ID> get_sns_initialization_parameter
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...erns the dapp, you likely know either the dapp canister ID or the SNS root canister ID by which an SNS is identified.
This article first describes how, starting from SNS root canister ID, you can find and interact with all SNS and dapp canisters.
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...rigin policy shields it from being accessed by other canisters than the II canister.
...tity anchor. When the user adds an additional device to the anchor, the II canister adds the principals derived from the master public key of the new device to
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'''On the Internet Computer blockchain, you can create canister smart contracts that run like daemon processes — that is, you can configu
The Internet Computer provides a means to avoid such problems, by allowing canister smart contracts to be configured so that they aer invoked by the blockchain
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...o find out why a proposal failed, you need to interact with the governance canister directly.
# Visit the governance canister page https://dashboard.internetcomputer.org/canister/rrkah-fqaaa-aaaaa-aaaaq-cai.
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...ay to the Internet Computer (IC), and allow users to seamlessly access the canister smart contracts running on it. The following figure shows how the boundary
...computer.org/docs/current/references/ic-interface-spec/#http-interface API canister calls], and the HTTP gateway, which provides an HTTP endpoint for users to
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When a user calls a canister method, the response contains the following information.
If the Internet Computer succeeded in running the canister method without any errors, then the response contains
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* Canister Ids file: You will need a file which stores the mappings of canister ids to their names. It should look something like this (Note: The actual id
...find the correct canister Ids from [https://dashboard.internetcomputer.org/canister/qaa6y-5yaaa-aaaaa-aaafa-cai the SNS-W]. Click ‘+’ next to list_deployed
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The cycles ledger is a canister that simplifies the management of cycles.
The cycles ledger (canister ID: <code>um5iw-rqaaa-aaaaq-qaaba-cai</code>) runs on the [https://dashboar
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$ dfx canister --network ic --identity node_operator call rwlgt-iiaaa-aaaaa-aaaaa-cai upda
$ dfx canister --network ic --identity node_operator call rwlgt-iiaaa-aaaaa-aaaaa-cai upda
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...node operation and related tasks. Often, NP is also used to refer to a non-canister [[Glossary#principal|principal]] that receives the rewards stemming from no
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...performance and efficiency and takes advantage of a wide community effort. Canister Wasm code is created by compiling software written in high-level programmin
...or the Internet Computer, the Wasmtime project is used to run user-defined canister smart contracts, which provides good performance. An important feature for
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...EM-files work as well, but the actual identity does not really matter, the canister simply does not accept anonymous messages.)
## Retrieve the BTC address from the ckBTC minter canister. Using the example principal from above, this is done via <code>call "mqygn
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...s each message in the block into the appropriate input queue of the target canister.
...ter C running on a subnet, there are several output queues. For each other canister C′, with whom C communicates, there is one output queue. This output queu
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...(but can communicate asynchronously with other subnets). Each subnet hosts canister smart contracts, up to a total of hundreds of gigabytes of replicated stora
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...ng some SNS tokens in liquid form or by staking them in the SNS governance canister or if you use a dapp that is under SNS DAO control, you rely on the fact th
...n66cg-gae SNS subnet]. The only canister that can install an SNS is an NNS canister called SNS-W. It will only install SNS canisters with code (Wasms) that hav
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The exchange rate canister (XRC) is a canister running on the [https://dashboard.internetcomputer.org/subnet/uzr34-akd3s-x
The cycle minting canister of the [https://wiki.internetcomputer.org/wiki/NNS_Canisters NNS] will make
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...succeeds, it means that at least 2/3rd of the blockchain nodes running the canister agreed to deliver that message. The technology used by the Internet Compute
...m-api-certified-data Certified Variables/Certified Data]. In a nutshell, a canister can a-priori choose to create a certificate for a piece of data and store i
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The only canister that can install an SNS is an NNS canister called SNS-W. It will only install SNS canisters with code (WASMs) that hav
As already explained, it is important to verify the SNS canister’s configurations. The swap parameters are part of these configurations. T
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The NNS of the Internet Computer is realized by a set of ''[[glossary#canister|canisters]]''. NNS canisters include:
#'''Ledger canister:''' The ledger canister stores the ICP utility ''token balance'' of each principal and the history
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===The NNS Governance Canister accepts motion proposals===
...ay where you can have your local computer send a message to the governance canister (signed on behalf of a neuron) that contains a motion proposal.
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...rlying communication and consensus protocol, the Internet Computer hosts [[Canister Smart Contracts]] called ''canisters'', which are stateful programs that ca
...Subnet_blockchain | subnets]] can communicate with one another, enabling [[Canister Smart Contracts]] that are hosted on different subnets to also communicate
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...ould be used as a scratch, temporary memory that will be cleared after any canister upgrade. The second type of memory is the '''stable memory''', which is a l
....png|alt=|512x512px|Figure 1. The two memories that can be accessed by the canister smart contracts.|center|frameless]]
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$ dfx canister --network ic --identity node-operator-hsm call rwlgt-iiaaa-aaaaa-aaaaa-ca
$ dfx canister --network ic --identity node_operator call rwlgt-iiaaa-aaaaa-aaaaa-cai re
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...n undesirable way, e.g., that favors the developers. In the case where the canister has no controller, it cannot be upgraded at all. This not only prevents evo
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...rigin policy shields it from being accessed by other canisters than the II canister.
...tity anchor. When the user adds an additional device to the anchor, the II canister adds the principals derived from the master public key of the new device to
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...ter if the user experience could be created on the Internet Computer using canister smart contracts, which are controlled by a DAO. A means has been provided t
One application has been the provision of special Bitcoin capabilities to canister smart contracts. This allows them to create bitcoin addresses, and send and
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...erhead for the execution layer of the IC is minimal. Stressing the counter canister can be seen as a way to determine the system overhead or baseline performan
All benchmark run against a small number of canister that simply return, as the goal of this benchmark is to measure throughput
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* People party canister
===== People party canister =====
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...ny language that can compile to Wasm can be deployed and instantiated as a canister. In practice, there is a lot of tooling, libraries, and boilerplate that ma
* [https://github.com/dfinity/sdk Motoko Canister Developer Kit]
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...itcoin directly on the Bitcoin blockchain in a secure manner. Naturally, a canister must be able to retrieve the UTXOs associated with its Bitcoin addresses. T
...nt/references/ic-interface-spec/#ic-management-canister virtual management canister] interface.
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...is, each neuron's ICP token balance is stored on an account on the ledger canister. In contrast to non-neuron accounts the controller can however not just tra
# by using the manage_neuron interface of the governance canister or
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...ing key present in the NitroKey, and sends the message to the NNS registry canister.
* The NNS registry canister creates a record for the new node and stores its cryptographic key material
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...ossible on macOS computers with M1 chips. You can only install the DFINITY Canister SDK dfx and the Candid compiler didc on Intel-based macOS and Linux compute
...ate key from your seed phrase and import that private key into the DFINITY Canister SDK. This step is required before you can Take control of your neurons.
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This account identifier lives in the Ledger canister that maintains the ICP addresses for the entire network. This account ident
...to the Internet Computer. IC Transaction Scanner is used, which lives in a canister (and whose code is visible here: https://github.com/ninegua/ic-qr-scanner).
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...f course, you can also require users to pay a fee in ICP and then let your canister convert the ICP to cycles, essentially imitating the gas model of Ethereum.
...ately 30 days and should give developers or users ample time to top up the canister before it is garbage collected.
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Voting reward parameters are defined in the SNS governance canister and can be changed by proposal. Details on the data structure ''VotingRewar
...an be held in an account that is owned by an SNS-controlled canister. This canister can then codify when the rewards are paid out and to whom.
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The Internet Computer is a general-purpose blockchain that hosts [[canister smart contract]]s. It is designed to [[Replace traditional IT with a World
...rtical_scaling_(scale_up) horizontally scale] the total volume of hosted [[canister smart contract]], and their computations and data, without limit. These sma
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* Preserve all canister state.
...ent called the [[Glossary#registry | registry]], which is implemented as a canister smart contract in the [[Network Nervous System]] subnet. Essentially, it st
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...ntifier and its ledger history are permanently removed from the governance canister.
...ICP utility tokens to one of your accounts in the Internet Computer ledger canister, you can click the ICP tab and see your new balance reflected.
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..., which allows it to play the role of a World Computer. For example, the [[canister smart contract]]s it hosts can process HTTP requests to serve interactive w
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The discussion around content filtering started when a developer hosted a canister containing a Super Mario 64 emulator in February 2022. The Node Provider re
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...on_to_ICP | Internet Computer]] is a general-purpose blockchain that hosts canister smart contracts. It is designed to provide a World Computer that can replac
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...have to install plugins or other software (and pay via tokens). The IC's "canister pays model" means that dapp developers can pay for the storage and compute
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│ │ ├── canister.pbuf
</syntaxhighlight>For example, the state of each canister is stored in a separate directory. In contrast, there’s a single file con
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...one of the resulting subnets. There are a handful of subnet (as opposed to canister) state files where this is not possible, e.g., subnet queues. For these fil
...1f931f87758ecd5dcd7c920a8468a5bacf9 | canister_states/00000000003000000101/canister.pbuf
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...s can build almost any online system or service desired, just by writing [[canister smart contract]] code. Canisters are [[smart contract]]s with breakthrough
For example, [[canister]]s are unstoppable, and also tamperproof, which means that when their code
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...entity-code-a-walkthrough-c1dd7a53f883) community-vetted Internet Identity canister] are not compromised
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...te the KYC process described [[Seed participant configuration with DFINITY Canister SDK#Step 3: Enable disbursal by passing the KYC process|here]] to control y
...s: Go to https://ic.rocks/principal/renrk-eyaaa-aaaaa-aaada-cai, look for "Canister interface" and the method "balance". There, paste your DFN address in to th
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...narks/13139 source]]. One way to get a comparison on the IC is to create a canister, import the [https://docs.rs/ed25519/latest/ed25519/ Rust ed25519 library]
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...age takes at least two consensus rounds. If the update message sends inter-canister messages, then the number of rounds increases correspondingly. The actual d
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...comparable to running a web2 application (e.g. on AWS). Read more about [[Canister smart contracts]] allow to serve webpages without the need for centralized
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...des and subnets can be obtained in machine readable form from the registry canister.
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