RGB++ SDK

This repository offers utilities for Bitcoin and RGB++ asset integration.

Packages in this repository

• @rgbpp-sdk/btc: Bitcoin part of the SDK
• @rgbpp-sdk/ckb: Nervos CKB part of the SDK
• @rgbpp-sdk/service: Wrapped interfaces of Bitcoin/RGB++ Assets Service

RGB++ Code Examples

• Find code examples at https://github.com/ckb-cell/rgbpp-sdk/tree/develop/examples/rgbpp

Related CKB Scripts (Contracts)

• CKB Bitcoin SPV Type Script: A type script for Bitcoin SPV clients which synchronize Bitcoin state into CKB

• RGB++ scripts/contracts: RgbppLockScript and BtcTimeLockScript

  • design docs: https://github.com/ckb-cell/RGBPlusPlus-design/blob/main/docs/lockscript-design-prd-en.md
  • testnet deployment: https://pudge.explorer.nervos.org/scripts#RGB++
  • mainnet deployment: https://explorer.nervos.org/scripts#RGB++

RGB++ Asset Workflow Overview

1. Creation of rgbpp_ckb_tx_virtual using @rgbpp-sdk/ckb

   • xUDT
   1. BTC → BTC
   2. BTC → CKB
   3. CKB → BTC (isomorphic rgbpp_btc_tx is not required in this workflow)
   • Spore
   1. BTC → BTC
   2. BTC → CKB
   3. CKB → BTC (isomorphic rgbpp_btc_tx is not required in this workflow)

   [!IMPORTANT] It's recommended to save the rgbpp_ckb_tx_virtual locally in case you need it in the future.

2. Creation of rgbpp_btc_tx through @rgbpp-sdk/btc

   1. construct isomorphic rgbpp_btc_tx based on rgbpp_ckb_tx_virtual and rgbpp commitment
   2. sign and broadcast rgbpp_btc_tx to obtain rgbpp_btc_txid

3. JoyID or dApp sends rgbpp_btc_txid and rgbpp_ckb_tx_virtual to RGB++ CKB transaction Queue (API Endpoint: /rgbpp/v1/transaction/ckb-tx)

4. RGB++ CKB transaction Queue will process the following things:

   1. verify the received requests

   2. continuously fetch request from the queue through a cron job

   3. check whether the confirmations of req.rgbpp_btc_txid is sufficient

   4. generate the witnesses for RgbppLocks in the rgbpp_ckb_tx_virtual

   5. add a paymaster cell into rgbpp_ckb_tx_virtual inputs if the CKB capacity is insufficient

      1. need to verify the existence of paymaster UTXO in the rgbpp_btc_tx

         based on the exchange rates of BTC and CKB, the paymaster BTC UTXO's value required to subsidize a paymaster CKB cell is approximately: paymaster_utxo_sats ~= 316 * ${ckb_price} / ${btc_price} * 100000000

      2. sign the paymaster cell and the entire transaction if needed

   6. finalize the rgbpp_ckb_tx_virtual to a rgbpp_ckb_tx

   7. broadcast rgbpp_ckb_tx and mark the job as completed upon tx-confirmation

Notes

• Bitcoin/RGB++ Assets Service is an open-source project designed to streamline the transaction workflow for Bitcoin and RGB++ Assets. Developers have the option to enhance it by implementing its features by themselves without limitations.
• For those who prefer to deploy their own Bitcoin/RGB++ Assets Service, please follow the instructions at the Deployment section in the btc-assets-api repository.

FAQ

How to get an access token of Bitcoin/RGB++ Assets Service?

See Generate a JSON Web Token (JWT) for Bitcoin/RGB++ Assets Service

Where is the error code description for the RgbppLockScript?

See RGB++ Lock Script Error Codes

License

ISC License