PHP Frontend dev for prototype, storing/verifying json hash on MultiChain


I need assistance building an attractive looking prototype to demo for an Academic Institute to store the hash of a json record of an academic record, and its signed hash on the MultiChain blockchain ledger. Any person with the hash of the certificate can verify that the authenticity of the certificate.

The Multichain node has been deployed on GCP and API details are provided below, with sample calls to write/read to the ledger:

Store Certificate Proof on Ledger

Web Form fields:

o Institute Name

o Student

o Course

o Description

o Student Mark

o Certificate Status

o Certificate Date

o Issuer Public Key

o Issuer Private Key

Certificate schema:

o InstituteName

o Student

o Course

o Description

o StudentMark

o CertificateStatus

o CertificateDate

a. Create hash of certificate (e.g. Base-64, MD5).

b. Create JSON Academic Proof token with:

o InstituteName

o Student

o Course

o Description

o Student Mark

o Certificate status (issued or revoked)

o CertificateDate

o Signed certificate hash (one way encryption, using issuers private key)

(e.g. see JWT guide [login to view URL] )

c. Issuer publishes to IssuingInstitute stream: Issuer Name, Public Key

{"method":"publish","params":["IssuingInstitute","BlockchainUniversity",{"json":{"Public Key":"03b4168088e8b3ed36def226b68d8c10976ae0e988b7bec6a8f607a9f476ac8482"}}],"chain_name":"nw-384-256-5"}

d. Issuer publish to Certificates stream:

Hash (as a key), JSON Academic Proof

Sample API call to publish to Certificates stream:

{"method":"publish","params":["Certificates","CertificateHash",{"json":{"InstituteName":"BlockchainUniversity","Student":"Michael Johnson","Course":"Accounting 201","Description":"An introduction to the accounting concepts, principles, and techniques used in recording business transactions.","StudentMark":"78","CertificateStatus":"Issued","CertificateDate":"8 May 2019","SignedHash":"SHash1fey803e32dnou8hjkne2399iji3edd39ejini3e3"}}],"chain_name":"nw-384-256-5"}

e. Display and log the certificate hash, InstituteName, Student to a local text file

Verify Certificate

a. Lookup certificate hash on web form, by looking up latest "hash" Key on Multichain Certificates stream. Return JSON Academic Proof (which includes Issuer Name and signed certificate hash)

Example API call:


Only use the latest transaction for each key (e.g. a Certificate may have been Issued on 1 January but revoked on 22 December). Display the latest/newest transaction for this key and signed hash.

b. Lookup Issuer Name on IssuingInstitute stream. Return Public Key of issuer.

Example API call:


Display public key of issuer.

c. Decrypt the signed certificate hash in the JSON Academic Proof with the IssuingInstitute public key.

If the stream key (hash) matches the decrypted signed hash, then the certificate was validly created (display message stating authenticity verified with issuer. Display issuing Institute name) and signed by the IssuingInstitute.

Multichain node details:

MultiChain node details:

RPC endpoint: [login to view URL]

Username: competent_lamport

Password: jeep roast awaken friend basics policy

Public Key: 03b4168088e8b3ed36de


Private Key: V7uFaibnZG7NkEuesmFFp9jKaT9t7stgApeiJT3QHEnYVbZS2tj8R6N7

To view transactions logged to keys on the streams on Multichain, visit:

[login to view URL]

Also attached is a very basic php script I've created to write and read to Multichain (no hashing / verification logic on this). Multichain JSON-RPC API guide: [login to view URL]

Квалификация: Blockchain, PHP, Rapid Prototyping, Web Development

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О работодателе:
( 11 отзыв(-а, -ов) ) Johannesburg, South Africa

ID проекта: #19474741

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