I tried to install it again and followed the whole process again from the fist.
Successfully I created both unsigned and signed certificates and the issue still remains same.
Here is my signed certificate:
{"@context": ["https://www.w3.org/2018/credentials/v1", "https://w3id.org/blockcerts/v3"], "type": ["VerifiableCredential", "BlockcertsCredential"], "issuer": "https://raw.githubusercontent.com/sreenumalae/DataStorage/main/testissuer.json", "issuanceDate": "2022-11-03T09:28:54Z", "id": "urn:uuid:004873c9-c21b-4f33-aae6-714eb964f626", "credentialSubject": {"id": "ecdsa-koblitz-pubkey:mkwntSiQmc14H65YxwckLenxY3DsEpvFbe", "alumniOf": {"id": "https://www.human-logic.com/"}}, "nonce": "1", "proof": {"type": "MerkleProof2019", "created": "2022-11-03T10:54:42.597456", "proofValue": "z9nmN4tsD8AYm9oa7cgcUrCN4Lqecj7HMdoAz1UbYbw8PLrmc2GoFJiV5bk9xXcWDbKsidjXSBoBsp7DqZX4WDfPS3sfTyt9vKrCE2NYjxS34TEmBhVW9uirAhM6uLq9QtxjLX8xu3wTaGSZrf8SHiHY9fUEVm9JufBjvD7axpkdGiEc48yQLynnVYEUtBZWTkVmwTkPg2XQWUNE6hPr9CcpmXBF5VBgxqaps9pyZmzaBBrGuiVJ7p3BD5c8d7C4AA2rbVPhPXTjK34ddVzDTy7W2XYfDrFE1jHmF87sYUzeVEWkwTzrNMQ5xWhwjvS9TwUo78272FgeW4TsKjZy7hyQ8tcAfeL5SH23uJetwMSn8qoQCJ9YngcWF3BqKrBGy6FZvjATvLHdGuCBjPcL5BhCPhP", "proofPurpose": "assertionMethod", "verificationMethod": "URL"}}
anchor for an issuance on sepolia
INFO - merkle_json: {‘path’: [{‘right’: ‘94b0236ef84cb4f5a32e5d66b47424d6d068908d3e6bc6eea13c35aaf4211c1b’}], ‘merkleRoot’: ‘a845bf3d74a5aa78b5ade32c44583640645b4459e651b4314830afb5b439dab0’, ‘targetHash’: ‘8885070fede3b20e463cc225436d604d9f312789fbbfe498270e1f130ade74d4’, ‘anchors’: [‘blink:eth:sepolia:0xe7a23bbb0150c8d0594f4241c29fb7da946daad7deac4a9644f1469d51351546’]}
INFO - merkle_json: {‘path’: [{‘left’: ‘8885070fede3b20e463cc225436d604d9f312789fbbfe498270e1f130ade74d4’}], ‘merkleRoot’: ‘a845bf3d74a5aa78b5ade32c44583640645b4459e651b4314830afb5b439dab0’, ‘targetHash’: ‘94b0236ef84cb4f5a32e5d66b47424d6d068908d3e6bc6eea13c35aaf4211c1b’, ‘anchors’: [‘blink:eth:sepolia:0xe7a23bbb0150c8d0594f4241c29fb7da946daad7deac4a9644f1469d51351546’]}
INFO - Broadcast transaction with txid 0xe7a23bbb0150c8d0594f4241c29fb7da946daad7deac4a9644f1469d51351546