sBridge

Flow & Primitives

Deposit, withdrawal, and trustless swap flows: protocol primitive reference

Deposit (External → SBChain)

User sends BTC to gateway external address
        ↓
Gateway confirms on Bitcoin chain
        ↓
Gateway issues BRIDGE.BTC IOU to user's SBChain account
        ↓
User trades BRIDGE.BTC on SBChain DEX

Withdrawal (SBChain → External)

User sends BRIDGE.BTC to gateway's SBChain account
        ↓
Gateway burns the IOU (asset_reserve_operation)
        ↓
Gateway releases BTC to user's Bitcoin address
        ↓
Transaction confirmed on Bitcoin chain

Trustless Swap (HTLC)

Both parties agree on terms off-chain
        ↓
Alice locks SBChain tokens in HTLC (htlc_create_operation)
        ↓
Bob locks BTC in Bitcoin HTLC using same hash
        ↓
Alice reveals preimage → claims Bob's BTC
        ↓
Bob uses revealed preimage → claims Alice's SBChain tokens
        ↓
Swap complete — no intermediary required

Protocol Primitives Summary

Primitive	Protocol Operation	Purpose
Gateway IOU token	asset_create_operation + asset_issue_operation	Tokenise external assets on SBChain
HTLC	htlc_create_operation	Trustless atomic swap
Withdraw permission	withdraw_permission_create_operation	Automated recurring gateway payments
Memo encryption	memo_data on transfers	Encrypted instructions to gateway (destination address, network, etc.)

Bridge Object IDs

Object	ID Format	Description
HTLC	1.16.x	Active hash time locked contract
Withdraw Permission	1.12.x	Active withdrawal permission

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