blobscriptions indexer

Ethscriptions indexer only for Blob-created ethscriptions, ESIP-8

How it works?

In src/indexing.ts we have trackBlobscriptions function, in future maybe the rest of the Ethscriptions indexer. In it we use Viem's watchBlocks method to listen on blocks and track only EIP-4844 (Blobs) transactions that has data: calldata (gzipped or not). Optionally you can track all overall blob transactions, not only blobscription ones, by passing onlyBlobscriptions: false to the trackBlobscriptions options. Then a the handler function passed to the trackBlobscriptions is called in turn which is passed the transaction and block details.

In the trackBlobscriptions we DO NOT parse, process or validate the actual blob contents, we don't even have it there. For how it can be done check exampleBlobProcessor function in the src/main.ts we do it inside the handler we pass to trackBlobscriptions.

The idea is that you can do that on the handler you pass, once you are sure that the there's blobscription transaction.

Currently, src/main.ts has trackBlobscriptions handler function that just sends the data to a given Webhook URL.

Deploy

Currently, I use Fly.io, which runs the src/main.ts with Bun (a JavaScript/TypeScript runtime). And there is one server deployed at https://deno-fly-viem-eths-indexer.fly.dev that is listening on mainnet and sending webhooks to https://webhook.site/9392df98-49f1-407c-8531-6a7190e22e1f

If you want to deploy your own, you should:

1. Register on Fly.io, install their CLI and login through there
2. Register on GetBlock.io to get an RPC node url that support blob transactions
3. In the ENV file you can pass your RPC_URL, WEBHOOK_URL and INDEX_CHAIN_ID
4. Populate the environment variables in .env.example, copy it to .env
5. Run fly launch --yes --copy-config --name your-indexer-name (only the first time, then fly deploy)
6. then run npm run env:populate
7. Deploy using fly deploy (you may need to update the Dockerfile/fly.tom)

In a bit I'll deploy a Cloudflare Worker that receives these webhooks, does the blob parsing and processing, and then re-distribute to registered webhooks (eg. you would be able to just give me a Webhook url).

Blobbed.xyz will receive the finalized stuff so it will show it in the site.

Example Creating blobs

Check out the create-blob-example.ts file.

If you don't want to deploy or anything, but just want to try create a BlobScription then you still need:

1. to get RPC from GetBlock.io and put RPC_URL in the .env file
2. switch the INDEX_CHAIN_ID to 1
3. add CREATOR_PRIVATE_KEY and make sure this wallet has some funds (~5-10$), otherwise it won't be able to create a blobscription transaction
4. Run bun run create-blob-example.ts

This way you'll use the currently deployed indexer and APIs (on blobbed.xyz).