Set a boundary for an issued asset
A trust line records a relationship between accounts for one currency. “Trust” here does not mean the issuer has been approved as safe.
Learn and inspect first. No wallet connection, seed entry, signing or transactions on this page.
Before you start
Use the exact asset identity from lesson 1. A trust line belongs to the classic fungible-token model; this is not an NFT purchase or native XRP setup. No signing is needed for this worksheet.
Your outcome: Read balance, limit, issuer controls and reserve implications without confusing a settings change with receiving money.
Review Wallet Basics · Jump to the guided worksheet · Common problems · What to keep
Words you will use
- Trust line
- A ledger relationship for a currency between two accounts. It does not certify trustworthiness.
- Limit
- A receiving limit in that relationship, not a payment or a guarantee against loss.
- Balance
- The amount recorded from the account perspective being shown. Check which side an explorer is displaying.
- Reserve
- XRP that must remain available to support an account and relevant ledger objects; it is different from a transaction fee.
- Rippling
- Moving balances through compatible trust-line relationships to complete a payment. No Ripple changes which paths may be used.
Understand what changes
TrustSet creates or modifies a trust-line relationship. Its LimitAmount identifies the currency, the counterparty issuer and the limit. Native XRP does not use trust lines. This lesson covers trust-line tokens, not MPT authorization.
Read limit and balance separately
Suppose a fictional holder has a limit of 100 units and a balance of 25. The limit is not a payment of 100, and the holder has not received 100 tokens. Limits govern the trust relationship; explicit trading can produce balances above a limit. Do not treat the number as an all-purpose loss cap.
Understand the controls
Authorization may be required by an issuer before a holder can hold its currency. Freeze settings can restrict the asset. Rippling can move value across compatible trust-line relationships as part of payments. No Ripple settings affect those paths; they do not make a token safe or remove issuer risk. Review both account and line settings before changing defaults.
Plan for reserves and removal
Ledger objects can affect the XRP reserve needed by an account. Reserve rules and amounts can change, and trust-line exceptions exist: check the current network rules rather than assuming every line costs the same. Setting a limit to zero does not erase a nonzero balance or guarantee immediate removal. A removable line must meet the ledger’s default-state conditions.
Read a member account before changing anything
Your paper account belongs to Member B. It holds 25 units of the club credit from Issuer A, with a receiving limit of 100. No new payment has been made. Use only these fictional facts; do not manufacture a real issuer address.
- Draw four separate boxes labeled network, currency plus issuer, balance and limit. Put Testnet, club credit/Issuer A, 25 and 100 into them. Explain aloud: changing the limit to 200 would not make the balance 200.
- Add a control column. Note whether issuer authorization is required and granted, whether freeze restrictions exist, and what the relevant ripple settings are. Unknown is a valid result: it means you need evidence, not a guessed default.
- Model an ordinary additional receipt of 30 units with permissions and limits otherwise satisfied. The illustrative balance becomes 55, not 130. Then model a proposed ordinary receipt of 60 more: it would exceed the 100 receiving limit. Do not generalize this exercise to every trading path, where limits behave differently.
- Plan reserve inspection separately from the token quantity. Obtain the network current base/incremental reserves and the account relevant owner objects when implementing a real tool. Do not multiply every visible token balance by one fixed XRP charge: trust-line and other object rules have exceptions.
- Write a departure plan: resolve the held balance through a deliberate redemption or transfer decision, then inspect non-default line settings on both sides. Setting the limit to zero alone is not proof the line disappeared. There can still be a balance or other state keeping it present.
- Ask whether the task needs a trust line at all. Reading a public record needs no signature. Receiving native XRP needs no trust line. Avoid adding a setting just because an advertisement labels it mandatory.
A support message says your 25 credits are stuck because your limit is only 100 and asks you to sign an unlimited limit. That explanation does not follow from the sample. Inspect the exact failure, issuer/network, authorization, freezes, destination and intended operation first. Increasing a limit is not a general repair for token problems.
Optional: connect the worksheet to a public record
In a read-only explorer account view, open the issued balances or trust-line section. Locate the precise currency and peer issuer, then compare balance, limit and any shown freeze/authorization/ripple fields. Identify whose perspective is displayed. If a field is missing from the interface, write not shown rather than assuming disabled. Your learning worksheet can stay fictional if no suitable record is available.
Official XRPL explorer directory · Network amendment references. Merely reading a public record does not need a wallet. Do not enter private or personal information in these exercises.
Common problems and what to check
An explorer displays a negative balance
Check whose perspective it uses and the two accounts in the line. A raw shared ledger entry is not always displayed from the holder perspective. Do not infer a debt from a sign without that context.
There is XRP but a new object cannot be created
Total balance is not the same as XRP available above reserve and fee needs. Check the exact result and current reserve rules before changing unrelated settings.
The line remains after the limit is zero
Inspect remaining balance and non-default state. Do not repeatedly submit the same setting or use an unknown token-clearing service.
What to keep before moving on
Save the four-box account worksheet, control checklist and exit plan. In lesson 4, use the same issuer to explain who controls the restrictions you found.
Explain your answer without looking at the worked example, then compare. If you guessed, revisit the relevant section. The checkboxes and quiz feedback stay on this page only; keep your project notes yourself.
Work through this example
A promotional page asks you to add an unlimited trust line to a token with a familiar ticker. You only wanted to inspect the project. What should you do next?
Compare your reasoning
Inspect public information without signing. Check the full issuer address and network, why a trust line is needed, the proposed limit and flags, issuer authorization/freeze controls, and reserve implications. A public wallet lookup does not require granting a trust line. A large limit is not a quality signal.
Steps are for this page only; reloading resets them.
Never change rippling, freeze or authorization flags just to clear a warning you do not understand. A successful TrustSet is a settings change, not a purchase or a safety endorsement.
Check your understanding
Do you need a trust line to receive native XRP?
Will setting the limit to zero erase tokens already held?
Balance is 25; limit changes from 100 to 200. What is the new balance before any payment?
An explorer asks for a signature just to inspect a public trust line. Is that necessary for reading?
Go deeper with official sources
Technical references checked 3 October 2026. Network amendments, wallet support and reserve rules can change. Check current documentation before implementing real transactions.