A centralized log management and SIEM platform built for compliance, auditing, anomaly detection, and infrastructure visibility.
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Wren
YAYZY
Trip to Carbon
Capture
Aerial
Website Carbon Calculator
Cloverly
Treepoints
BlockchainSign
OriginStamp
ScoreDetect
Woleet
Stampery
Bitstamped
Certificado
Proof of existence
BlockchainSign is a blockchain timestamping service for people holding documents they cannot hand over.
Conventional options all require custody: a copyright office wants a deposit copy, a notary wants to see the paper, an e-signature platform wants the file on its servers. BlockchainSign never receives the file at all. The document is hashed with SHA-256 in the user's own browser using the Web Crypto API, and only the resulting hash is written to the Ethereum blockchain.
The result is a certificate file recording the hash, the transaction and the timestamp. Because each certificate is its own Ethereum L1 transaction, with the payload hash readable as UTF-8 on a public block explorer, verification does not run through the vendor's portal: if BlockchainSign shut down, existing certificates would still verify.
There is no subscription and no cryptocurrency wallet involved. Certificates are bought as credits with a card and spent when needed. Credits are valid for 12 months; an issued certificate never expires.
Key points
What it does not do. A timestamp proves that a file existed in that exact form at that time โ existence and integrity. It does not prove authorship or ownership, and it is not a substitute for copyright registration. There is no API or integrations yet, and no eIDAS qualified timestamp.
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Based on our record, Wren seems to be more popular. It has been mentiond 7 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can probably go to fiverr and have someone build you a website - just send them wren.co and ask how expensive it would be to create something similar. Source: over 3 years ago
If you really have it made, like you're upper middle class, you can easily afford to sequester the amount of carbon you emit yearly for not much money. My dog and I emit approx 18tons of carbon a year, which is like 3.5 times the world average. I calculated it with wren.co and I can use them to sequestor that much carbon for 60$ a month. I cant afford to do that at this stage in my life because I should be... Source: over 3 years ago
You could offset part of your past emissions on wren.co. Source: almost 4 years ago
At the end of Veritasium's latest YouTube video, he does an ad spot for Wren (wren.co). Wren is a "Benefit Corporation" (legal mission is both profit and positive impact) that aims to accept your money in exchange for doing something to offset your carbon footprint. Conservation International seems to do the same thing, but they are a 501(c)3 charity (https://www.charitynavigator.org/ein/521497470). Source: about 4 years ago
Http://wren.co (YC S19) is a literal monthly subscription to offset your carbon footprint. - Source: Hacker News / over 4 years ago
YAYZY - Track the carbon footprint of each purchase in real-time
OriginStamp - Blockchain-based, tamper-proof timestamping. Data Integrity as a Service.
Trip to Carbon - A carbon footprint calculation API for travel.
ScoreDetect - ScoreDetect is an innovative platform that serves as a permanence layer for data provenance, enabling systems and authorities to independently verify data authenticity.
Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.
Woleet - Blockchain timestamping and certification Software as a Service , SaaS.