Both the Trezor Model One and the Trezor Safe 3 can send Bitcoin to any on-chain address. The question is not capability — it is whether the differences between the two models matter enough for regular on-chain use. The short answer: the Model One handles Bitcoin transactions correctly, but the Safe 3 adds a certified secure element chip that meaningfully increases resistance to physical attack. For users with significant BTC on their device, that distinction matters. For someone using a dedicated wallet with limited competition balance while keeping the bulk of their holdings in cold storage, the Model One does everything an on-chain transaction requires. Bitok Arena Research analyzed both models against the specific requirements of frequent Bitcoin transaction use.
Both the Model One and the Safe 3 sign Bitcoin transactions without exposing the private key to the connected computer. Where they differ: the Model One lacks a secure element, so private keys can be extracted via fault injection by a skilled adversary with physical access. The Safe 3's EAL6+ secure element resists this attack class. Physical access risk is the deciding factor between the two models.
Trezor Model One versus Safe 3 resolves cleanly once you define what you are protecting. If the device wallet holds only the BTC allocated for active use — not long-term savings — the Model One is adequate. The device signs transactions through Trezor Suite, generates Native SegWit (bc1q) addresses that are accepted by any on-chain destination, and keeps the private key offline during the entire signing process. How to send Bitcoin from Trezor Suite to an external address is identical on both models: connect via USB, open Trezor Suite, navigate to the Bitcoin account, enter the destination address, set the amount and fee, confirm on the device screen, and broadcast. The workflow does not differ between the two devices.
Native SegWit and Address Compatibility
Both Trezor models support Native SegWit (bc1q) addresses — the preferred format for on-chain transactions because they produce smaller transactions, confirm at lower fee rates, and are accepted by every current Bitcoin service. Trezor Suite creates Bitcoin accounts using different derivation paths. In the account setup, select the Native SegWit option (BIP84) to generate a bc1q address. This address is the sending identity for any on-chain transaction from this wallet. All Bitcoin sent from this address in any session is linked to it in the block explorer, and the history is permanent and public.
Bitok Arena compared the Trezor Model One and Safe 3 across the specific requirements of frequent Bitcoin transaction use.
Bitcoin support — identical on both models. Both generate Native SegWit (bc1q) addresses via BIP84. Both sign transactions offline through Trezor Suite. Both display the destination address on the device screen for verification before signing.
Secure element — absent in Model One; present (EAL6+ certified) in Safe 3. The secure element resists fault injection attacks that can extract private keys from devices without it. The Safe 3's secure element also handles PIN verification in hardware.
Passphrase (25th word) support: available on both models. A strong passphrase creates a hidden wallet separate from the PIN-protected view, adding significant protection against physical compromise on either device.
Whether a hardware wallet is worth the cost for frequent on-chain use depends on usage patterns. Hardware wallets ensure that even if the connected computer is compromised with malware, the private key never leaves the device — the transaction is signed inside the hardware and the signed transaction is broadcast from the computer without the key ever appearing in software. For participants who send Bitcoin transactions regularly and move meaningful amounts, this protection justifies the device cost. The Model One at its price point provides this core protection. The Safe 3 adds the secure element layer on top of it.
Practical Setup for On-Chain Transactions
Setting up a Trezor for regular Bitcoin sending follows the same steps on both models. Initialize the device, write the seed phrase on paper and store it in a physically secure location — not photographed, not in any cloud storage. Set a strong PIN. Add a passphrase for an additional hidden wallet layer. In Trezor Suite, create a Bitcoin account using the Native SegWit derivation path. The receiving address shown is the bc1q address that appears as the sender identity on any outbound transaction. Before the first send, verify the destination address on the device screen — Trezor Suite displays the destination address on the hardware device itself for confirmation, which protects against address substitution attacks on the computer.
Bitok Arena mapped the steps in a Trezor Suite Bitcoin send to identify where each security layer activates.
Device unlock — PIN entered on the hardware device itself. A keylogger on the connected computer cannot capture the PIN because it is entered via the device's physical buttons.
Destination address verification — Trezor Suite displays the recipient address on the device screen independently of the computer display. An address substitution attack modifying the destination in the browser would be detected at this step.
Transaction signing: the private key never leaves the device. The transaction is constructed on the computer, sent to the device for signing, and the signed transaction returns for broadcast — without the key. Both Model One and Safe 3 complete this flow identically.
Fee selection in Trezor Suite controls how quickly the transaction confirms on the Bitcoin network. For time-sensitive sends — reaching a destination before a round closes, for example — select a fee tier that Suite estimates will confirm within the next block or two. The fee is paid from the sending wallet balance and does not affect anything about the receiving end — only the BTC that arrives at the destination address within the window counts toward the position. The minimum sat/vbyte fee needed to confirm reliably varies with network congestion; Trezor Suite's recommended fee tier reflects current mempool conditions.
Which Model for Regular Bitcoin Use
The practical answer: the simplest hardware wallet for on-chain transactions is whichever device you already own. If choosing between the Model One and Safe 3 specifically, the Safe 3 is the better long-term choice because its secure element protects against a physical attack class the Model One cannot resist. But if you have a Model One and want to start using it for on-chain sends, set it up with a strong passphrase and use it. The obstacle between a user and their first on-chain transaction is not which Trezor model they own — it is whether the device is initialized, the wallet funded, and the destination address verified before confirming.
The Trezor Model One and Safe 3 both sign Bitcoin transactions correctly for any on-chain destination. The difference is physical attack resistance, not on-chain capability. Set up either device with a PIN and passphrase, generate a Native SegWit address, and fund it. The device's security model determines what physical capability an adversary needs to compromise it — not whether it can send BTC.
Both Trezor models satisfy the core requirement of self-custody Bitcoin transactions: the private key stays on the device, the transaction is signed offline, and BTC moves directly from the user's address to any destination with no exchange or custodian in the path. That is the architecture that makes on-chain sending fully self-sovereign — and either Trezor device supports it. Open Trezor Suite, generate a Native SegWit address in the Bitcoin account, and use it as the source for any on-chain Bitcoin transaction that requires confirmed self-custody.
Bitok Arena Research found the Trezor Model One and Safe 3 functionally identical for Bitcoin transaction signing: same Native SegWit support, same Trezor Suite workflow, same offline key storage architecture. The distinguishing factor is the EAL6+ secure element in the Safe 3, which resists fault injection attacks that can extract private keys from the Model One given physical access — the correct choice when BTC held exceeds the user's tolerance for physical compromise risk.