Using the Data Anchor

You can use the Data Anchor's Rust client or CLI tool to post data on-chain and retrieve it from the ledger or our indexer service.

We do not recommend using public RPC nodes for production because of their low rate limits and low stake, which makes transaction landing slower than private RPC nodes. Please reach out if you'd like help in setting up a private endpoint.

1

Prerequisite Setup

If your codebase is in Rust, please use the Rust client. Otherwise, we also provide a command line utility.

Rust SDK

Install it directly:

cargo add nitro-da-client

Or add the latest version in your Cargo.toml:

Cargo.toml

[dependencies]
nitro-da-client = "0.1.x"

CLI Utility

• Install solana-cli by following the official documentation.

curl --proto '=https' --tlsv1.2 -sSfL https://solana-install.solana.workers.dev | bash

• Configure solana-cli to use your preferred RPC and network e.g.solana config set --url https://api.devnet.solana.com for devnet.

• Download nitro-da-cli .

curl -sSf https://nitro-da-cli.termina.technology/install.sh | sh

• Run nitro-da-cli to see all the available commands and their options.

2

Select Blober Program ID

Make sure to use the correct program ID for mainnet and devnet:

Network	Program ID
Solana Mainnet	9i2MEc7s38jLGoEkbFszuTJCL1w3Uorg7qjPjfN8Tv5Z
Solana Devnet	2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH

3

Create Namespace

A namespace represents a data collection, and only your keypair is allowed to write data to it. To create a sample namespace called nitro on Solana devnet:

Rust SDK

let blober_client = BloberClient::builder()
    .payer(payer)
    .program_id(program_id)
    .indexer_from_url(&indexer_url)
    .await?
    .build_with_config(config)
    .await?;

• The payer is an Arc<Keypair> that points to the Solana keypair to use with the client

• The program_id is the address of the on-chain blober program to interact with

• The indexer_url is an optional parameter if using our indexer service

• The config is a solana_cli_config::Config object that sets the transaction RPC details

CLI Utility

nitro-da-cli \
    --program-id "2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH" \
    --namespace "nitro" \
    blober initialize

If you no longer need the data commitment, close the namespace and reclaim the rent from the on-chain account:

nitro-da-cli \
    --program-id "2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH" \
    --namespace "nitro" \
    blober close

4

Upload Data

To upload data, store it in a file and point the CLI to that file:

Rust SDK

let transaction_outcomes = blober_client
    .upload_blob(data, fee, blober_id, timeout)
    .await?;

• The data is a slice of bytes (&[u8])

• The fee is a fee strategy that determines the priority fee

• The blober_id is the blober PDA, or namespace, the data should be uploaded to

• [Optional] The timeout specifies how long the client should wait before stopping a data upload attempt (if unset, the client will retry indefinitely)

CLI Utility

nitro-da-cli \
    --program-id "2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH" \
    --namespace "nitro" \
    blob upload \
    --data-path "./data.txt"

Alternatively, you can directly pipe the data into the command or pass it in as a hex string via the --data param:

cat "./data.txt" | nitro-da-cli --program-id "2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH" --namespace "nitro" blob upload

nitro-da-cli \
    --program-id "2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH" \
    --namespace "nitro" \
    blob upload \
    --data "<some-hex-string>"

After the upload is complete, you'll see output similar to the following:

Slot: 3323, Signatures: [2Vkwid2ZTman9zvGq2Tp7P2S5CUWJ2fsZSQzGzaoFkDMAgS9xNccCvNe7PJuHrXNotsVu3BoJAsRa9jdfbZraXvS, faRmYWXPQUDJcFpqffJVE49f5aMSCLYnqp1xH3DZc3SM2Uayc7jReRfR6LjNkFxeuviSJTXMTtSAmAL9tAppwyK, 5XsiKe95nk9GmkceXQkEWapAuAcEQFFYEqMfh5kyeszSxjXepSyDbgzEXmzoQniWMdWvv6mVm5Qbyh9e1i8hHF7K, 2nk2Fj2xwM7oRfsqbmDBNqYwPCLGxHcGUujBo7napJgavMSWFEQ6C9wYmLCkKcuaetBs89vtMbtYzEKaKLKjasKd, 43zzTdgoZBR3sDphuPQTZQHZdT4Ms976bRiY8jguHPZbNPibY3k4EVnrRGKCbUy97i1RzsdMRXkYyv2KJZp9MQZE], Success: true

5

Fetch Data from Ledger

Use the signatures from the previous step to retrieve the original data from Solana:

Rust SDK

let blob = blober_client
    .get_ledger_blobs_from_signatures(blober, signatures)
    .await?;

Alternatively, set the slot number and number of lookback slots to fetch historical data.

let blobs = blober_client
    .get_ledger_blobs(slot, blober, lookback_slots)
    .await?;

CLI Utility

nitro-da-cli \
    --program-id "2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH" \
    --namespace "nitro" \
    blob fetch 2Vkwid2ZTman9zvGq2Tp7P2S5CUWJ2fsZSQzGzaoFkDMAgS9xNccCvNe7PJuHrXNotsVu3BoJAsRa9jdfbZraXvS faRmYWXPQUDJcFpqffJVE49f5aMSCLYnqp1xH3DZc3SM2Uayc7jReRfR6LjNkFxeuviSJTXMTtSAmAL9tAppwyK 5XsiKe95nk9GmkceXQkEWapAuAcEQFFYEqMfh5kyeszSxjXepSyDbgzEXmzoQniWMdWvv6mVm5Qbyh9e1i8hHF7K 2nk2Fj2xwM7oRfsqbmDBNqYwPCLGxHcGUujBo7napJgavMSWFEQ6C9wYmLCkKcuaetBs89vtMbtYzEKaKLKjasKd 43zzTdgoZBR3sDphuPQTZQHZdT4Ms976bRiY8jguHPZbNPibY3k4EVnrRGKCbUy97i1RzsdMRXkYyv2KJZp9MQZE

This returns hex encoded bytes, so remember to hex decode it to get the data back in its original form.

6

Fetch Data from Indexer (Optional)

If you need the data to be stored for a longer time period than the ledger's lifetime of three days, you may want to use an indexer.

Please reach out if you'd like us to set up an indexer on your behalf.

To retrieve data from the indexer, all you need to provide is the slot number at which the blob was finalized. (You can find this value from the upload command above.)

Rust SDK

let blobs = blober_client
    .get_blobs(slot, blober)
    .await?;

CLI Utility

nitro-da-cli \
    --program-id "2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH" \
    --namespace "nitro" \
    --indexer-url "wss://your-indexer.deployment" \
    indexer blobs 3323

This will produce an output similar to the one from fetching data from the ledger.

In addition, you can also request a proof of inclusion or proof of completeness from the indexer:

Rust SDK

let proof = blober_client
    .get_slot_proof(slot, blober)
    .await?;

CLI Utility

nitro-da-cli \
    --program-id "2RWsr92iL39YCLiZu7dZ5hron4oexEMbgWDg35v5U5tH" \
    --namespace "nitro" \
    --indexer-url "wss://your-indexer.deployment" \
    indexer proofs 3323

This contains metadata that prove that the indexer's return value is correct, and it hasn’t tampered with the original data posted on-chain.