Signatures

Verify an ECDSA signature

POSThttps://ecdsa.com/api/v1/verify

Verifies a signature over a message (or a precomputed digest) against a public key. Curves: P-256, P-384, P-521, secp256k1. Signature formats auto-detected: ASN.1 DER or raw r‖s, in hex, base64 or base64url. Public key formats: PEM SPKI ("PUBLIC KEY"), EC JWK, or a bare SEC1 point in hex/base64. A signature that simply does not verify returns valid: false with HTTP 200; only unparseable input yields 400.

API 密钥: 可选；密钥需要 api 范围
使用密钥时的配额消耗: 每次调用 1 个单位
速率限制: 每个 IP 每分钟 60 次请求

请求

JSON 请求体：VerifyRequest

字段	类型	必需	说明
publicKey	string	是	PEM "PUBLIC KEY" (SPKI), EC JWK JSON, or a bare SEC1 point in hex/base64.
message	string	是	The signed message (or its digest — see messageIsDigest).
signature	string	是	DER or raw r‖s signature in hex, base64 or base64url (auto-detected).
hash	string	否	Digest applied to the message (ignored when messageIsDigest is true). 默认值 "SHA-256" "SHA-256"、"SHA-384"或"SHA-512" 之一
curve	string	否	Force a curve, or auto to infer it from the key. 默认值 "auto" "auto"、"P-256"、"P-384"、"P-521"或"secp256k1" 之一
messageEncoding	string	否	How the message string encodes bytes. 默认值 "utf8" "utf8"、"hex"或"base64" 之一
messageIsDigest	boolean	否	When true, message bytes are used as the digest directly (no hashing). 默认值 false

响应

200Verification outcome.

字段	类型	必需	说明
valid	boolean	是
curve	string \| null	是	Curve the signature verified on (or the single candidate when it did not).
curvesTried	string[]	是	Every curve tried, in order.
keySource	string	是	How the public key was encoded. "pem-spki"、"jwk"或"raw-point" 之一
signatureFormat	string	是	"der"或"raw" 之一
details	object	是
details.r	string	是	r as hex.
details.s	string	是	s as hex.
details.highS	boolean	是	s > n/2 (non-canonical for Bitcoin & co).
notes	string[]	是	Per-curve diagnostics.

响应头： X-Request-Id · X-RateLimit-Limit · X-RateLimit-Remaining · X-RateLimit-Reset · X-Quota-Limit · X-Quota-Remaining · X-Quota-Reset

状态码	含义	错误码
400	Bad request. Input limits: a request body of at most 100 KB (a larger one is answered with 413) and arrays and objects nested at most 64 levels deep, JSON documents inside string fields included.	invalid_json missing_field invalid_input private_key_rejected
401	Unauthorized.	unauthorized
403	Forbidden.	forbidden_scope
404	Not found.	not_found
405	Method not allowed.	method_not_allowed
413	Payload too large.	payload_too_large
429	Too many requests.	rate_limited quota_exceeded
500	Internal server error.	internal_error
503	Service unavailable.	service_unavailable
504	Gateway timeout.	timeout

每个错误响应都带有 JSON 信封；错误表说明了每个错误码的含义和处理方法。

示例

P-256 key as PEM, UTF-8 message, DER signature

curl

curl -sS 'https://ecdsa.com/api/v1/verify' \
  -H 'content-type: application/json' \
  -d '{
  "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE4+8TCP3Hop/Acb8L7reksO9flyt1\nsUhvEqUs7a45RVDRDtAIZdTnOJcAhTCQvdzUBO4KUyxSRcZm6ro+2RGfSQ==\n-----END PUBLIC KEY-----",
  "message": "The quick brown fox jumps over the lazy dog",
  "signature": "3045022100df542bb71e0e3019086f1b1ba51f1aa0ec5e6afca05c3f5a7f4f02f5b7c39d24022030c59f1ac6d8c6893fb2a5ac8dfd9388d31ebd3382510dcfb7f28f9182eb1131"
}'

JavaScript (fetch)

const response = await fetch("https://ecdsa.com/api/v1/verify", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE4+8TCP3Hop/Acb8L7reksO9flyt1\nsUhvEqUs7a45RVDRDtAIZdTnOJcAhTCQvdzUBO4KUyxSRcZm6ro+2RGfSQ==\n-----END PUBLIC KEY-----",
    "message": "The quick brown fox jumps over the lazy dog",
    "signature": "3045022100df542bb71e0e3019086f1b1ba51f1aa0ec5e6afca05c3f5a7f4f02f5b7c39d24022030c59f1ac6d8c6893fb2a5ac8dfd9388d31ebd3382510dcfb7f28f9182eb1131"
  }),
});
console.log(response.status, await response.json());

Python (httpx)

import httpx

response = httpx.post(
    "https://ecdsa.com/api/v1/verify",
    json={
        "publicKey": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE4+8TCP3Hop/Acb8L7reksO9flyt1\nsUhvEqUs7a45RVDRDtAIZdTnOJcAhTCQvdzUBO4KUyxSRcZm6ro+2RGfSQ==\n-----END PUBLIC KEY-----",
        "message": "The quick brown fox jumps over the lazy dog",
        "signature": "3045022100df542bb71e0e3019086f1b1ba51f1aa0ec5e6afca05c3f5a7f4f02f5b7c39d24022030c59f1ac6d8c6893fb2a5ac8dfd9388d31ebd3382510dcfb7f28f9182eb1131",
    },
    timeout=30.0,
)
print(response.status_code, response.json())

响应 200

{
  "valid": true,
  "curve": "P-256",
  "curvesTried": [
    "P-256"
  ],
  "keySource": "pem-spki",
  "signatureFormat": "der",
  "details": {
    "r": "df542bb71e0e3019086f1b1ba51f1aa0ec5e6afca05c3f5a7f4f02f5b7c39d24",
    "s": "30c59f1ac6d8c6893fb2a5ac8dfd9388d31ebd3382510dcfb7f28f9182eb1131",
    "highS": false
  },
  "notes": []
}

这是 API 对此示例的响应，于2026年10月20日为本页生成；其中的相对时间和天数都以当天为准。

错误码

错误码	状态码	含义
invalid_json	400	The body is not valid JSON or not a JSON object; or the input nests arrays and objects more than 64 levels deep (JSON documents inside string fields count too), or is too complex to inspect for private keys.
missing_field	400	A required field is absent or empty.
invalid_input	400	A field could not be parsed — the message explains exactly why.
private_key_rejected	400	The request contains private-key material (a PEM PRIVATE KEY block, an OpenSSH, SSH2 or PuTTY private key, or a JWK with "d"). Never send private keys anywhere.
unauthorized	401	The Authorization or X-API-Key header is malformed, the API key is not valid (wrong checksum, unknown, revoked or expired), or the operation needs a key.
forbidden_scope	403	The API key is valid but lacks a scope this operation requires; the message names it.
not_found	404	No operation exists at this path.
method_not_allowed	405	The path exists but does not accept this HTTP method; see the Allow header.
payload_too_large	413	The body exceeds 100 KB.
rate_limited	429	Too many requests — see Retry-After.
quota_exceeded	429	A daily or monthly quota of the API key's account is used up. X-Quota-Reset (and Retry-After) say when it starts over; retrying earlier cannot succeed.
internal_error	500	Unexpected server error.
service_unavailable	503	API keys cannot be verified right now (the key store is unreachable); retry shortly.
timeout	504	The operation did not finish within its time budget.

Schema

Error

The error envelope of every non-2xx response.

字段	类型	必需	说明
error	object	是
error.code	string	是	Machine-readable error code. Each response lists the codes it can carry; new codes may be added within v1, so treat an unknown code by its HTTP status.
error.message	string	是	Human-readable explanation (English).
error.requestId	string	否	The X-Request-Id of this request — quote it when reporting a problem. Sent since v1.1.
error.detail	object	否	Structured context for the error, such as the offending field; omitted when there is none. 成员名任意
error.docs	string	否	Where the error codes are explained. Sent since v1.1. 格式 uri

所有操作都列在 API 参考中。