Blockchain-based electronic and digital signature satisfies the requirements set in Section 8 of ECommerce Act and the Rule 6, Section 2 of the Rules on Electronic Evidence.

Blockchain technology uses public-key cryptography (Elliptical Curve Digital Signature Algorithm or ECDSA) that uses a public key and private key for digitally signing transactions. This falls under the definition of digital signature that is an electronic signature consisting of a transformation of an electronic document or an electronic data message using an asymmetric or public cryptosystem such that a person having the initial untransformed electronic document and the signer's public key can accurately determine: whether the transformation was created using the private key that corresponds to the signer's public key; and whether the initial electronic document had been altered after the transformation was made.

Based on the principle of technology neutrality, a blockchain-based digital signature is legal as long as it satisfies the requirements of the law.

ECA IRR, Sec. 38 (a) states;

Technology Neutrality. - All solutions implemented shall neither favor a particular technology over another nor discriminate against or in favor of particular vendors of technology.

And from DTI-DOST JDAO 02-2001, Sec. 4;

Technology Neutrality. – None of the provisions of these Rules shall be applied so as to exclude, restrict, or deprive of legal effect any method of electronic signature that satisfies the requirements referred to in Section 8 of the ECommerce Act, or in Rule 5 of these Rules which is as reliable as was appropriate for the purpose for which the data message was generated or communicated, in the light of all the circumstances, including any relevant agreement.

ECA IRR = ECommerce Act Implementing Rules and Regulations

DTI-DOST JDAO - Department of Trade and Industry and Department of Science and Technology Join Department Administrative Order