One wallet, nine chains: how Vaultr does multi-chain across EVM, Bitcoin and Solana

The short version: Vaultr gives you a single self-custody wallet that spans nine chains — Ethereum, Base, Polygon, Arbitrum, Optimism, BNB Chain, Bitcoin, Solana, and Vaultr’s own Blockmaze. Under the hood it derives addresses across three very different worlds (EVM account-based, Bitcoin UTXO, and Solana’s SVM) from one HD key tree using BIP32/44. One backup, one recovery, three ecosystems — and your keys never leave your control.

What does “one wallet, nine chains” really mean?

Most people end up with a drawer full of wallets: one for Ethereum and its L2s, a separate one for Bitcoin, another for Solana. Each has its own seed, its own backup, its own recovery anxiety. It’s fragmented and fragile.

Vaultr collapses that into one wallet across nine chains:

• Ethereum
• Base
• Polygon
• Arbitrum
• Optimism
• BNB Chain
• Bitcoin
• Solana
• Blockmaze (Vaultr’s native Layer 0)

That’s not nine wallets bolted together. It’s a single key foundation that derives the right kind of address for each chain — so you back up and recover once, and everything is covered.

How can one key tree cover three different blockchain models?

The magic is hierarchical deterministic (HD) derivation using the BIP32/44 standards. From a single root, Vaultr deterministically derives keys and addresses along standardized paths — a structured tree where each branch can serve a different chain.

The genuinely hard part is that these chains don’t share an account model. Vaultr’s HD derivation spans all three:

• EVM chains — Ethereum, Base, Polygon, Arbitrum, Optimism, BNB Chain, and Blockmaze — use an account-based model
• Bitcoin uses the UTXO (unspent transaction output) model
• Solana uses the SVM (Solana Virtual Machine) model

Three fundamentally different ways of representing balances and transactions, all derived from one HD key tree. That’s what lets a single backup secure assets across ecosystems that otherwise have almost nothing in common.

Why is supporting EVM, Bitcoin and Solana together so hard?

Because each model demands different handling at the protocol level:

• In the account-based EVM world, an address has a running balance and a nonce, and transactions debit that balance directly. The same address format works across all seven EVM chains Vaultr supports.
• In Bitcoin’s UTXO model, there’s no running balance at all — your funds are a set of discrete unspent outputs, and spending means consuming outputs and creating new ones. Address derivation and transaction construction work completely differently.
• In Solana’s SVM, accounts and programs follow yet another structure, with its own key and address conventions.

Many wallets pick one world and stay there. Vaultr derives correct keys and addresses for all three from the same BIP32/44 tree, which is precisely why it can present “one wallet” without cutting corners on any chain.

How does multi-chain stay self-custodial across all nine?

More chains usually sounds like more risk. Vaultr keeps it self-custodial by securing the one underlying key foundation rather than scattering secrets per chain.

That foundation is split with Shamir Secret Sharing over GF(256) into a 2-of-3 scheme — device, server, and recovery shares — so no single share reveals anything and no single party (Vaultr included) can move your funds alone. Because every chain derives from this same protected root, your Bitcoin, your Solana, and all your EVM assets inherit the same self-custody guarantees at once. One security model, nine chains.

What does the EVM side unlock specifically?

Across its EVM chains, Vaultr layers on ERC-4337 v0.7 account abstraction (via a Pimlico bundler and paymaster). That brings counterfactual addresses, gas sponsorship, paying gas in other tokens, and batched atomic transactions to the account-based chains — including Blockmaze, which is ERC-4337 native at the protocol level.

Bitcoin and Solana keep their native strengths — Bitcoin’s battle-tested UTXO security, Solana’s high throughput — while the EVM chains get the smart-account experience. You don’t choose one paradigm; you get the best of each.

A quick note on scope: Vaultr is non-custodial, and swaps currently redirect to external DEXs while features like cards and fiat are coming soon. The nine-chain wallet itself, with HD derivation across EVM, Bitcoin, and Solana, is the shipping foundation.

FAQ

Which nine chains does Vaultr support?

Ethereum, Base, Polygon, Arbitrum, Optimism, BNB Chain, Bitcoin, Solana, and Blockmaze (Vaultr’s native Layer 0).

Do I need a separate wallet or backup for Bitcoin and Solana?

No. All nine chains derive from one HD (BIP32/44) key tree spanning EVM account-based chains, Bitcoin’s UTXO model, and Solana’s SVM. You back up and recover once.

How is my key protected across so many chains?

The single root is split via Shamir Secret Sharing over GF(256) in a 2-of-3 scheme (device, server, recovery). No single share reveals anything, so every chain inherits the same non-custodial guarantee.

Does account abstraction work on all nine chains?

ERC-4337 v0.7 account abstraction applies to the EVM chains, including the ERC-4337-native Blockmaze. Bitcoin and Solana use their own native models.

Want to hold EVM, Bitcoin, and Solana in one place? Explore the Vaultr wallet.