> For the complete documentation index, see [llms.txt](https://docs.trustlesswork.com/trustless-work/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trustlesswork.com/trustless-work/v2-en/api-rest/deploy/change-milestone-status.md).
# Change Milestone Status
### **Headers**
Name
Value
Content-Type
application/json
x-api-key
<token>
### Open API
## Update the status (and optionally evidence) of one or more milestones
> v2 turns this into a batch operation: send an array of \`updates\`, each touching ONE milestone by index. Service provider signs.
```json
{"openapi":"3.0.0","info":{"title":"👋🏼 Trustless Work Core API — All Endpoints (Unified)","version":"1.0"},"security":[{}],"paths":{"/escrow/single-release/v2/change-milestone-status":{"post":{"description":"v2 turns this into a batch operation: send an array of `updates`, each touching ONE milestone by index. Service provider signs.","operationId":"ChangeMilestoneStatusV2Controller_change","parameters":[],"requestBody":{"required":true,"content":{"application/json":{"schema":{"$ref":"#/components/schemas/ChangeMilestoneStatusV2Dto"}}}},"responses":{"200":{"description":"Unsigned XDR built successfully.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/UnsignedTransactionResponse"}}}},"400":{"description":"Request body or query params fail schema validation (wrong type, missing required field, unknown property).","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ProblemDetailsResponseDto"}}}},"401":{"description":"Missing, malformed, expired, revoked or invalid API key.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ProblemDetailsResponseDto"}}}},"403":{"description":"API key is valid but does not have the role required for this operation.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ProblemDetailsResponseDto"}}}},"422":{"description":"Payload is well-formed but a business rule rejects it (e.g. amount out of range, role not allowed for this user).","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ProblemDetailsResponseDto"}}}},"500":{"description":"Unexpected server-side failure. Use the `traceId` to look up the incident in server logs or contact support.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ProblemDetailsResponseDto"}}}}},"summary":"Update the status (and optionally evidence) of one or more milestones","tags":["Single Release Escrow V2"]}}},"components":{"schemas":{"ChangeMilestoneStatusV2Dto":{"type":"object","properties":{"contractId":{"type":"string","description":"Deployed v2 escrow contract (C...)."},"serviceProvider":{"type":"string","description":"Service provider wallet — signs the transaction."},"updates":{"description":"Batch list of milestone updates (up to 50). Each entry mutates ONE milestone.","type":"array","items":{"$ref":"#/components/schemas/MilestoneStatusUpdateV2Dto"}}},"required":["contractId","serviceProvider","updates"]},"MilestoneStatusUpdateV2Dto":{"type":"object","properties":{"index":{"type":"number","description":"Zero-based index of the milestone to update."},"newStatus":{"type":"string","description":"New status string. Convention: pending → in_progress → completed. The on-chain contract treats it as opaque text.","maxLength":50},"newEvidence":{"type":"string","description":"Optional new evidence reference. When absent, the contract leaves the previous evidence value untouched.","maxLength":500}},"required":["index","newStatus"]},"UnsignedTransactionResponse":{"type":"object","properties":{"unsignedXdr":{"type":"string","description":"Base64-encoded unsigned XDR. Sign it with the appropriate wallet and submit to Soroban / Horizon to execute the operation on-chain."},"txHash":{"type":"string","description":"SHA-256 hash of the prepared transaction. Use as a correlation key between this build call and any follow-up (pending-write tracking, idempotency keys, audit logs)."}},"required":["unsignedXdr","txHash"]},"ProblemDetailsResponseDto":{"type":"object","properties":{"type":{"type":"string","description":"Stable URI identifying the error type. Hash-link points to the docs."},"title":{"type":"string","description":"Short human-readable summary of the problem."},"status":{"type":"number","description":"HTTP status code, repeated here for typed clients."},"code":{"type":"string","description":"Machine-readable error code. Stable across versions; safe to switch on."},"detail":{"type":"string","description":"Human-readable explanation specific to this occurrence."},"instance":{"type":"string","description":"URI of the request that triggered the error."},"traceId":{"type":"string","description":"Correlation id propagated from the `X-Trace-Id` header (or generated). Use it when contacting support to reference a specific request."},"extensions":{"type":"object","description":"Optional structured context. Shape depends on the error code; documented per-endpoint when relevant.","additionalProperties":true}},"required":["type","title","status","code","detail"]}}}}
```
### **What this Endpoint returns?**
This endpoint returns the transaction unsigned so that the transaction can be signed by means of a customer wallet.
### **Use example:**
```javascript
import axios from "axios";
const http = axios.create({
baseURL: "https://dev.api.trustlesswork.com",
timeout: 10000,
headers: {
"Content-Type": "application/json",
"x-api-key": your_api_key,
},
});
export const useExample = async () => {
// Get the signer address
const { address } = await kit.getAddress();
const response = await http.post(
"/escrow/single-release/v2/change-milestone-status",
{
// body requested for the endpoint
},
);
// Get the unsigned transaction hash
const { unsignedTransaction } = response.data;
// Sign the transaction by wallet
const { signedTxXdr } = await signTransaction(unsignedTransaction, {
address,
networkPassphrase: WalletNetwork.TESTNET,
});
// Send the transaction to Stellar Network
const tx = await http.post("/stellar/submit-transaction", {
signedXdr: signedTxXdr,
});
const { data } = tx;
return data;
}
```
---
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Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
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