[FEATURE] - Replace EdDSA with ECDSA for vertex cryptographic signing function

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Problem Description

Currently we're using EdDSA (using the ed25519 curve) for vertex signing.

ts-drp/packages/node/src/store/credential.ts

Lines 45 to 51 in a6c4705

	async signWithEd25519(data: string): Promise<Uint8Array> {
	if (!this._ed25519PrivateKey) {
	throw new Error("Private key not found");
	}
	const signature = await this._ed25519PrivateKey.sign(uint8ArrayFromString(data));
	return new Uint8Array(signature);

This signature scheme requires public keys to be known before verification.

Proposed Solution

ECDSA (using the secp256k1 curve) does not have this issue, as the public key can be derived from the signature (vertex.signature), the original data (vertex.hash), and the recovery ID (which is typically embedded in the signature).

The public key then will be verified against vertex.peerId. In order to do that,

ts-drp/packages/network/src/node.ts

Lines 84 to 85 in a6c4705

	const tmp = this._config.private_key_seed.padEnd(32, "0");
	privateKey = await generateKeyPairFromSeed("Ed25519", uint8ArrayFromString(tmp));

should be changed to secp256k1.

Implementation PR

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Reference Issues

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Unresolved questions

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Additional Information

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