Analysis
Live data
How to Check If Your Bitcoin Wallet Is Traceable (For Free)
How to Check If Your Bitcoin Wallet Is Traceable (For Free)
Most explainers stop at 'Bitcoin isn't anonymous.' We built a free tool that runs the actual check against our own node, shows the exact formula behind every flag, and never asks for your private key.
BIP69 Was Meant to Hide Your Wallet. It Became a Fingerprint.
A standard designed to remove a privacy leak turned into a signal of its own. What that says about wallet fingerprinting, which tells actually survive good address hygiene, and why our privacy audit deliberately doesn't look for them.
Your Wallet's 'Consolidate UTXOs' Button Can Undo Your Privacy in One Click
Combining unrelated UTXOs into one transaction -- what coin-control tools call consolidation -- can permanently link two exchange withdrawals you never meant to connect. How the heuristic works and how to avoid it.
Bitcoin Address Reuse: The Privacy Mistake Exchanges Make For You
Reusing a Bitcoin address links every payment it ever receives, and the most common culprit isn't a careless user -- it's an exchange assigning you a fixed deposit address. How to check whether your own wallet already fixed this.
Managing Your Bitcoin in Practice: Custody, Inheritance and Taxes in Spain
Managing Your Bitcoin in Practice: Custody, Inheritance and Taxes in Spain
Practical guides for holding Bitcoin in the real world: where to keep custody, what fails without a succession plan, and what tax obligations you have in Spain.
Bitcoin as a Retirement Plan in Spain: What the Public System Can't Promise You
Spain's reduction coefficients already penalize early retirement, demographics are squeezing the system long-term, and self-custodied Bitcoin offers an alternative with no third party able to change the rules -- with its own counterweight of responsibility.
Bitcoin Taxes in Spain: Self-Custody, Modelo 721, and What You Actually Owe
What's taxable when you sell or swap Bitcoin in Spain, what Modelo 721 actually requires, and what an automated tool can -- and cannot -- estimate for you.
How to Leave Your Bitcoin as Inheritance Without Putting Your Seed in a Will
What goes wrong without succession planning for Bitcoin, which technical options exist (redundancy, multisig, timelock), and what should -- and shouldn't -- go in your will.
Bitcoin Custody in Spain: The Rules That Apply If You Live There or Hold Funds There
What Spain's move from the Bank of Spain registry to MiCA/CNMV authorization actually means if you're a resident, expat, or holder with Bitcoin exposure in Spain -- plus an honest, brand-free comparison of self-custody, exchange, and institutional custody.
Bitcoin On-Chain Data Without Paying for Glassnode: What's Free and What Isn't
The Bitcoin Cycle Score Built on a Verifiable Node, Not Borrowed APIs
The Bitcoin Cycle Score Built on a Verifiable Node, Not Borrowed APIs
How the NodeWitness Bitcoin cycle Score combines 10 indicators into one number, why the highest-weighted input comes from our own node instead of a vendor API, what we withhold and why, and how to check the public backtest yourself.
Bitcoin NUPL: Why It Duplicates MVRV, and When to Read It Anyway
NUPL (Net Unrealized Profit/Loss) is mathematically the same signal as MVRV, expressed as a percentage instead of a ratio. How it's calculated, its capitulation and euphoria zones, and why counting both as separate evidence is a mistake.
Auditing the NodeWitness Cycle Score: Where It Failed
Three documented failures from auditing our own Score's track record: a distribution signal that's useless for short-term timing, cycle extremes it never flagged, and a DCA simulator with no proven edge over plain DCA -- unpolished numbers, published on purpose.
Version History of the NodeWitness Cycle Score
The Score's change history, with dates: what launched, what was withheld and why, what's been evaluated to improve it, and what's been adopted -- so no future change goes unrecorded.
Bitcoin DCA Explained: What a Real Backtest Adds Beyond a Calculator
Bitcoin DCA in plain terms -- its real advantages and limits -- and how Score DCA goes further than a static DCA calculator with a live historical backtest.
Bitcoin HODL Waves: Calculated From Our Own Node, Not a Vendor
How NodeWitness calculates Bitcoin HODL waves from our own node's UTXO set every week -- not licensed from a paid vendor -- and how to read the age bands inside the cycle Score.
The Bitcoin Fear & Greed Index Works Backwards, on Purpose
Why NodeWitness reads extreme fear as an accumulation signal and extreme greed as distribution, what the index is made of, and its real limits.
Puell Multiple in Bitcoin: Miner Profitability, the Hash Ribbon, and Cycle Bottoms
What the Puell Multiple measures, why Bitcoin mining economics make it work, what its red and green zones mean, and how we verify the bottom signal with hash ribbon data computed from our own node.
Bitcoin MVRV Ratio: Why Its Cycle Thresholds Keep Shrinking
Where NodeWitness's MVRV figure actually comes from, how it's calculated, how to read its bottom and top zones, and the real numbers behind five straight cycles of shrinking thresholds.
More
We Verified the Coldcard Hacker's Laundering Offer Ourselves. Here's What 'Public' Actually Means Here.
The Coldcard entropy hack is now four waves and ~1,816 BTC, likely multiple attackers, not one. We checked the on-chain laundering offer against mempool.space directly — and it's a case study in why a public address isn't the same as an identified person.
Bitcoin Valuation Without the Hype: MVRV, Puell Multiple, and the 200-Day Average
A fast, no-hype way to check whether Bitcoin is historically cheap or expensive right now: MVRV, the Puell Multiple, and price vs. the 200-day moving average -- how they combine, and what none of them predicts.
Coldcard's Random Number Generator Was Reading the Clock, Not the Chip
A 2021 firmware regression left some Coldcard seeds with roughly 40 bits of entropy instead of 128. What broke, which devices carry it, and why updating the firmware fixes nothing on its own.
BIP-110: The Node Operator's Decision Tree for August 2026
BIP-110's mandatory signaling window hits in August 2026. What actually changes for your node, your keys, and your self-custody setup — and what doesn't.