Why does a SOL to Bitcoin swap sometimes require extra confirmations beyond the Solana network

05 September 2026

A SOL to Bitcoin swap requires extra confirmations beyond the Solana network because the exchanger must wait for Bitcoin’s slower, probabilistic finality before it can safely release BTC to you. Solana finalizes a transaction in under a second, but Bitcoin’s proof-of-work chain needs multiple blocks to ensure the swap’s incoming SOL is not reversed or double-spent.

The core reason is that Bitcoin and Solana have fundamentally different security models. Solana uses a high-speed proof-of-history consensus that produces a block every 400 milliseconds. A transaction is considered final after a few seconds. Bitcoin, however, relies on proof-of-work, where a block is produced roughly every 10 minutes. A single Bitcoin block is not final; it can be orphaned if another block is found at the same height. Exchanges and swap services typically wait for a set number of Bitcoin confirmations - often 1 to 6 - before treating a transaction as irreversible. This is standard practice across all Bitcoin services, not just this exchanger.

The extra confirmations are not applied to the Solana side. They are applied to the Bitcoin side after the exchanger has received your SOL. The process works like this: You send SOL to the exchanger’s address. The Solana network confirms that transfer in seconds. The exchanger then broadcasts a Bitcoin transaction to your wallet. Bitcoin miners must include that transaction in a block. The exchanger then waits for subsequent Bitcoin blocks to build on top of that block. Each new block counts as one confirmation. Only after the required number of confirmations does the exchanger mark the swap as complete and the BTC as spendable.

Why does the exchanger not treat a single Bitcoin block as enough? Because a Bitcoin block can be reorganized. If the exchanger released your BTC after one block, and that block was later orphaned, the exchanger would lose the BTC it sent you. It could not recover it. The SOL you sent is already gone. The exchanger would be out both assets. The confirmation count is a risk-management tool, not a technical bug.

The number of confirmations required varies by the amount swapped and the exchanger’s internal policy. Larger swaps may require more confirmations. Some services let you see the required confirmations before you start. The delay is typically between 10 minutes and an hour, depending on Bitcoin network congestion and the number of confirmations set.

This is a specific instance of a broader principle: when moving assets between chains with different finality speeds, the slower chain dictates the settlement time. The same logic applies if you swap SOL for Ethereum, Litecoin, or any other proof-of-work asset. The exchanger must wait for the receiving chain to reach a safe level of finality.

If you want to understand how the exchanger handles the entire process - from receiving your SOL to delivering the BTC - read the hub page titled "Using an exchanger to bridge Solana assets across chains." It covers the full flow and the risks that arise when you rely on a third-party service instead of a direct on-chain swap.

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