TSR Endpoint

Updated: April 4, 2026 1 min read

Endpoint

POST https://tsr.open-tsa.eu

Request

Parameter	Value
Method	POST
Content-Type	`application/timestamp-query`
Body	RFC 3161 TimeStampRequest (binary, ASN.1 DER)
Max body size	64 KB
Rate limit	60 requests/minute per IP

Response

Parameter	Value
Content-Type	`application/timestamp-reply`
Body	RFC 3161 TimeStampResponse (binary, ASN.1 DER)
X-TSA header	`open-tsa.eu`
Cache-Control	`no-store`

Supported algorithms

sha256 — SHA-256 (recommended)
sha384 — SHA-384
sha512 — SHA-512 (maximum security)

Error responses

HTTP Status	Error	Meaning
400	`bad_request`	Body empty or missing
415	`unsupported_media_type`	Wrong Content-Type
429	—	Rate limit exceeded
500	`tsa_error`	Internal server error

Example

curl

openssl ts -query -data document.pdf -cert -sha256 -no_nonce -out req.tsq curl -s -S -H “Content-Type: application/timestamp-query” –data-binary @req.tsq https://tsr.open-tsa.eu -o resp.tsr echo “TSR size: $(wc -c < resp.tsr) bytes"