What Is an XRPL Account Sequence Number?
If you look up an XRP Ledger account — on this site's own Wallet Lookup tool, or any block explorer — you'll see a field called Sequence alongside the balance. It's easy to skip past, but it's actually a useful, concrete piece of information about how active an account has been.
What the sequence number actually is
Every XRP Ledger account has a Sequence value that starts at a small number when the account is first activated and increases by exactly one every time that account successfully submits a transaction. It's not a count of incoming transactions (payments received don't increment it) — it only tracks transactions the account itself has sent: payments, trust line changes, DEX offers, and so on.
Why the ledger needs it
The sequence number does a specific, important job: it prevents replay attacks. Every transaction an account submits must specify the exact next sequence number the network expects from that account. If you submitted a transaction with sequence number 5, the network won't accept another transaction from the same account claiming to also be sequence 5, and it won't accept sequence 7 before sequence 6 has gone through. This makes it impossible for someone to intercept a validly-signed transaction and resubmit ("replay") it later to duplicate its effect — each transaction is tied to a specific, one-time-only slot in that account's history.
This is a common pattern across many blockchains (often called a "nonce" elsewhere), and the XRP Ledger's version of it is simply called the sequence number.
What it tells you when you look up a wallet
Because the sequence number only increases when an account actually sends a transaction, it's a rough but genuinely useful activity signal:
- A sequence number very close to the account's starting value suggests the account has sent very few (or zero) outgoing transactions — it may have only ever received funds, or been created and largely unused.
- A high sequence number tells you the account has actively sent many transactions over its lifetime.
It's not a perfect measure of "how long an account has existed" (an account can sit dormant for years without changing its sequence number) or "how much activity it's seen" (incoming payments don't count), but combined with the account's balance and owner count, it gives you a more complete picture than the balance alone.
A word of caution
A high or low sequence number by itself doesn't tell you whether an account is trustworthy, legitimate, or safe to send funds to — it's an activity signal, not a safety signal. See our Scam Checker and its disclaimer for what on-chain checks can and can't tell you about an address.
Related reading
For the other account-level field worth understanding, see Understanding XRP Ledger Reserves. For why any of this is publicly checkable in the first place, see Is My XRP Address Public?.