January 2020
Intermediate to advanced
530 pages
11h 11m
English
Content preview from Blockchain Development for Finance Projects
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Creating a method to write the hashes to the blockchain
Next, let's look at the hashFile method. The hashFile method is called after the user submits the directory path to be secured for hashing and writing the directory components and parameters to the blockchain:
- We first capture the local state and methods of the app from the this object. We also fetch the directory path submitted by the user and store it in the DirPath variable:
hashFile = () => { let app = this; var DirPath = this.state.fields.DirPath;
- Next, we call the hashwrite API in our backend server with the directory path (DirPath) as the input parameter:
fetch('http://localhost:3600/api/hashwrite', { method: 'POST', headers: { 'Accept': 'application/json', 'Content-Type': ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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