Guide XII-014

Zero Balancing

Fritz Frederick Smith1970
Client cardCompare
[source: …] where a claim comes from[uncertain] not confirmed in a primary source[synthesis] the writer's reconstruction

1. Introduction

Version followed: the Zero Balancing Health Association (ZBHA) Core curriculum (Zero Balancing I and II) as ZBHA-certified practitioners, ZBHA faculty and ZBHA-affiliated course listings describe it, framed by the founder's published work (Fritz Frederick Smith, Inner Bridges: A Guide to Energy Movement and Body Structure; The Alchemy of Touch: Moving Towards Mastery Through the Lens of Zero Balancing). The detailed Core protocol (hand positions and full sequence) is taught hands-on in class; its full text is not publicly published [uncertain: not verified].

What it is. Zero Balancing (ZB) is a clothed, table-based, hands-on bodywork method developed in the early 1970s by Fritz Frederick Smith, MD, a physician, osteopath and acupuncturist who studied with the British Five Element acupuncturist J.R. Worsley (travelling to England to do so in 1972) [source: Omega Institute teacher biography; Doucette 2012]. The practitioner uses finger pressure and gentle traction on areas of tension in bone, joints and soft tissue, mainly at the key skeletal joints that carry gravitational, postural and movement forces [source: ABMP practitioner page]. Smith credits his father, a chiropractor, with an early grounding in conscious, compassionate touch [source: Doucette 2012].

How change happens, as ZB holds it. In ZB's own terms the body has both an energy and a structure, and the method works on the relationship between them [source: Heart of Touch; Doucette 2012]. Bones are described as conduits for the body's deepest energies, and the "foundation joints" (spine, pelvis, hips, feet) as key to energy transmission [source: Bodywork Education Project; Doucette 2012]. A fulcrum, a held point of contact or field of tension, is said to give a "point of stillness around which energy and structure can balance" [source: BTAC], letting the body relax and reorganise [source: ABMP]. ZB teachers hold that when energy and structure are balanced, outmoded emotional patterns and imprints of past trauma tend to fall away [source: Bodywork Education Project; BTAC]. Interface touch, contact with structure and energy at the same time, is presented as allowing deep contact while keeping clear boundaries between practitioner and client [source: Bodywork Education Project]. These are the method's own concepts, described here as ZB holds them.

Fit for a psychotherapist. ZB is a touch method. Core courses are open to people familiar with bodywork, but certification (at least as described in 2009) was limited to licensed health-care professionals [source: Ryan 2009]. Whether hands-on work falls within your own licence is a question for your licensing board [synthesis].

Evidence status (one line). Evidence is very limited: one small uncontrolled mixed-methods pilot study reported higher self-rated wellness after a series of four sessions [source: Rhoads et al. 2020, abstract]; no controlled efficacy trials are known [uncertain]. Practitioner sites list reduced pain and stress among benefits [source: ABMP]; these are the practitioners' claims. ZB is complementary and is not a treatment for any physical or mental disorder.

2. Framework

Training and certification route [source: Ryan 2009, unless noted]

  • Core programme: Zero Balancing I and II. After Level I a student can give a full session; after Level II they should understand the protocol, theory and principles. A current Core-level listing teaches the theory and principles, a basic whole-body protocol of about 30 minutes, distinguishing body energy from body structure through touch, energy as a working tool, the energetic anatomy of the skeleton, fulcrums, the body-mind interface, and witnessing, monitoring and responding to the client, with hands-on practice; it welcomes non-health-care providers and gives a certificate for 25 CE hours [source: Omega Institute 2026 workshop].
  • Certification: 100 hours of coursework, case studies, written essays and hands-on evaluations with certified practitioners and faculty; the ZBHA assigns a mentor (a certified Zero Balancer or faculty member) who reviews case studies and essays. Only those who complete certification may use the title "Zero Balancer" or list ZB on printed material. Certification is not required to keep taking classes or to give sessions.
  • Electives: body mechanics; integrating ZB into full-body massage; Chinese roots; work with the skull; children; people with disabilities.
  • Who certifies: in 2009, the ZBHA (head office then in Maryland, with regional hubs; courses taught in the US, Canada, Mexico, Europe and New Zealand) [source: Ryan 2009]. The US Department of Labor's O*NET certification finder now lists the certifying organisation as the Zero Balancing Association (Charlottesville, Virginia), describing a professional continuing-education programme for health-care professionals that includes an oral or written exam [source: O*NET certification record]. Check the association's current requirements before relying on the 2009 figures above. In the UK, accredited ZB teachers run courses in England and Scotland [source: BTAC]; a UK teacher's page directs training enquiries to Zero Balancing UK Ltd and names a Zero Balancing Association (UK) [source: Tree of Life Therapy]; which UK body awards certification is [uncertain].
  • Faculty lineage: Jim McCormick, LAc, trained with Smith from 1974 and became the first Smith-approved teacher in 1979 [source: Bodywork Education Project].

Session structure (as the sources describe it)

  1. Evaluation of the foundation joints: tissue tension, range of motion, joint play, quality of motion and ligament end-feel [source: Doucette 2012].
  2. Fulcrums placed at areas of imbalance, using finger pressure, gentle traction or held stretches, contacting structure and energy field together [source: Doucette 2012; ABMP; BTAC].
  3. Monitoring "working signs" to set the session's pace, rhythm and length [source: Doucette 2012].
  4. Re-evaluation of the joint after the fulcrum [source: Doucette 2012].
  5. Half-moon vectors and closing: the closing sequence and the half-moon vector are taught in Core training, and their technique is not described here [uncertain: not verified].

Format. Fully clothed, on a treatment table [source: ABMP; Heart of Touch]. Typically 30 to 45 minutes of hands-on work [source: Doucette 2012]; the basic whole-body protocol takes about 30 minutes [source: Omega Institute 2026]; practitioners book 60-minute appointments [source: ABMP].

Number of sessions. No fixed course is published. The pilot study gave a series of sessions and measured after the fourth [source: Rhoads et al. 2020]. Practitioners say effects keep building for several days [source: Heart of Touch].

Criteria for moving on. Within a session, a change on re-evaluation (freer motion, better end-feel) shows a fulcrum is done [source: Doucette 2012]; working signs guide when to move to the next area [source: Doucette 2012]. Between sessions, decide jointly with the client, based on their own goals and experience, whether to continue, pause or stop [synthesis].

Combining with psychotherapy. The cited sources give no ZBHA or founder guidance specifically on combining ZB with psychotherapy [uncertain]. One practitioner page calls ZB "like psychotherapy, but without the talking" [source: Heart of Touch]; ZB teachers present it as a tool for personal growth and anxiety and other mind-body issues [source: Bodywork Education Project]; these are practitioner claims. Three formats, in order of preference [synthesis]:

  • Refer to a certified Zero Balancer and keep psychotherapy separate; integrate the experience in talk sessions.
  • Separate, clearly framed ZB sessions by the same clinician, only if trained, within licence scope, with separate written consent.
  • Within a psychotherapy session, only after training, with explicit consent, a clear purpose and an agreed return to talk work; never as a default.

Professional-body positions. No psychotherapy board is known to have published a position specific to ZB [uncertain]. Treat it as therapeutic touch under your board's rules on touch [synthesis].

3. Guiding principles

  • Energy and structure together (ZB concept) [source: Heart of Touch; Doucette 2012]: the practitioner keeps attention on both the physical joint and the client's whole response, not on the joint alone.
  • Interface touch [source: Bodywork Education Project]: contact is clear and definite, so the client can feel where the practitioner ends and they begin. In therapy terms, the touch itself models a boundary.
  • Nothing is forced [source: ABMP]: take tissue to engagement and hold; never push through resistance.
  • Stillness as the lever [source: BTAC; Doucette 2012]: the fulcrum is held still; change is expected from the holding, not from manipulation.
  • Work at bone and foundation joints [source: ABMP; Doucette 2012]: contact goes to skeletal structures and key joints, not to superficial muscle rubbing.
  • Witness, monitor, respond [source: Omega Institute 2026]: observe the client continuously and adjust to what you see.
  • Working signs set the pace [source: Doucette 2012]: breathing changes, eye movements, small reflex movements and gut sounds tell you when to hold, slow or move on.
  • Evaluate, act, re-evaluate [source: Doucette 2012]: every fulcrum is checked against how the joint was before.
  • Protocol first, reasoned deviation [source: Hamwee 2020, abstract]: follow the taught protocol; ZB teachers discuss when exceptions apply and when departing from it serves the client better.
  • Consent before and during; the right to stop [synthesis]: the client can pause, change or end touch at any moment, and you check in during the session, not only at the start.
  • Never sexual [synthesis]: no contact with breasts, genitals or other intimate areas; clothing stays on; no touch is ever framed as sexual or romantic.
  • Attribute, don't promise [synthesis]: speak of energy, interface and fulcrums as ZB's concepts, and make no claim that ZB treats any disorder.
  • Scope and single role [synthesis]: work within your licence and training, and protect the psychotherapy frame from role confusion.

4. Intervention inventory

Items 4.3 to 4.8 are the ZB method as the sources describe it. They need Core training: hand positions, joint-by-joint sequence and the closing are learned hands-on and are not given here [uncertain: not verified]. Items 4.1, 4.2 and 4.9 to 4.14 are the psychotherapist's own frame around the bodywork and are [synthesis] unless tagged otherwise.

4.1 Informed consent for a touch-based complementary method

  • Purpose: make sure the client chooses ZB knowing what it is, what touch it involves, and its evidence status; required before any session [synthesis].
  • Steps:
    1. Explain in plain words: ZB is complementary bodywork developed by Fritz Smith; the client lies clothed on a table; the practitioner uses finger pressure, gentle traction and held stretches mainly at the foundation joints: spine, pelvis, hips and feet [source: ABMP; Doucette 2012].
    2. Name where touch will and will not go: no intimate areas, clothing stays on [synthesis].
    3. Give the evidence status in one sentence (very limited; no controlled trials known) and say it does not treat any disorder [synthesis].
    4. Present ZB's concepts (energy, structure, interface) as the method's own ideas [synthesis].
    5. State the right to stop at any time, and agree a stop signal (word or raised hand) [synthesis].
    6. Offer alternatives: no touch, hands-off grounding, or referral to a separate certified Zero Balancer (4.11, 4.13).
    7. Record written consent, kept separate from general therapy consent [synthesis].
  • Example language (illustrative): "This is a hands-on method. You stay fully dressed on the table, and I'd work with light pressure and gentle stretches around your back, hips and feet. The ideas behind it, like 'energy' and 'structure', are Zero Balancing's own way of describing things; research on it is very limited, and it isn't a treatment for any condition. You can say 'stop' at any point and I'll take my hands away straight away. Would you like time to think about it?"
  • Watch for: compliance without real choice (a client who 'goes along' to please you); a history of abuse or medical conditions affecting joints or bones that needs medical advice first; consent offered mainly to stay in the relationship. Working: the client asks questions, sets limits, and can say no without strain.

4.2 Pre-session screening and check-in

  • Purpose: decide whether to proceed today and set the client's own focus [synthesis].
  • Steps:
    1. Ask about current physical state: recent injury, surgery, pain, pregnancy, joint or bone conditions; if in doubt, ask the client to check with their doctor first [synthesis].
    2. Ask about emotional state and arousal level today; if highly activated, dissociated or in crisis, postpone touch and work verbally [synthesis].
    3. Ask what the client would like from the session, in their own words [synthesis].
    4. Re-confirm consent and the stop signal [synthesis].
  • Example language (illustrative): "Before we start, how is your body today, any new pain or injuries? And how are you feeling in yourself? We can still decide to just talk."
  • Watch for: new medical symptoms (refer to doctor, do not proceed), substance use, acute distress. Working: a brief, clear yes or no, and a client-chosen focus.

4.3 Evaluation of the foundation joints

  • Purpose: find where tension, restriction or imbalance sits before placing any fulcrum [source: Doucette 2012].
  • Steps:
    1. With the client clothed, assess the foundation joints (spine, pelvis, hips, feet) as taught in Core training [source: Doucette 2012].
    2. Note for each: tissue tension, range of motion, joint play, quality of motion, and the end-feel of the ligaments [source: Doucette 2012].
    3. Attend to both levels at once: the structural finding and, in ZB's terms, the energy felt through the contact [source: Omega Institute 2026; Doucette 2012].
    4. Note the areas that will receive fulcrums; keep a baseline for re-evaluation (4.7) [source: Doucette 2012].
  • Example language (illustrative): "I'm going to start by gently checking how your hips and lower back move. I'll tell you before I place my hands each time."
  • Watch for: pain on movement (stop and do not work into pain) [synthesis]; bracing or breath-holding. Working: a clear baseline you can compare against later.

4.4 Interface touch (establishing contact)

  • Purpose: make contact that, in ZB's terms, meets structure and energy together while keeping clear boundaries between practitioner and client [source: Bodywork Education Project; Doucette 2012].
  • Steps:
    1. Announce the contact before you touch [synthesis].
    2. Make definite, clear contact at the bone or joint, not a vague or stroking touch [source: ABMP; Bodywork Education Project].
    3. Feel for the point where the tissue engages (ligament engagement, in Doucette's description), without pushing past it [source: Doucette 2012].
    4. Keep your own attention clear and present, aware of where your contact ends and the client begins [source: Bodywork Education Project].
  • Example language (illustrative): "I'm placing my hands under your lower back now. Let me know if the pressure is too much or not right."
  • Watch for: startle, flinching or pulling away (pause and check); the client 'leaving' (glazed eyes, no response). Working: the client settles and breathing slows.

4.5 Fulcrums (finger pressure, gentle traction, held stretches)

  • Purpose: the core ZB technique: a still point of contact or a held field of tension that, as ZB holds it, lets energy and structure reorganise [source: BTAC; Doucette 2012; ABMP]. Used at areas found on evaluation.
  • Steps:
    1. Go to an area identified in evaluation [source: Doucette 2012].
    2. Make interface contact (4.4) and take up slack until the tissue engages [source: Doucette 2012].
    3. Add specific finger pressure, a gentle traction or a held stretch to create the fulcrum [source: ABMP; BTAC].
    4. Hold still; nothing is forced [source: ABMP; BTAC].
    5. Watch for working signs (4.6); they guide how long to hold and when to move on [source: Doucette 2012].
    6. Release gradually rather than abruptly [synthesis].
    7. Re-evaluate the area (4.7) [source: Doucette 2012].
  • Example language (illustrative): "I'm going to hold here for a little while. You don't need to do anything, just notice what you notice."
  • Watch for: pain (stop), rising distress or dissociation (see 4.10), muscular guarding. Working: working signs appear, tissue softens, and joint motion improves on re-evaluation [source: Doucette 2012].

4.6 Monitoring working signs

  • Purpose: read the client's response moment to moment to set pace, rhythm and session length [source: Doucette 2012; Omega Institute 2026].
  • Steps:
    1. Keep the client's face, breath, hands and feet in view while you work [synthesis].
    2. Note ZB's working signs: rapid eye movement or eye fluttering, changes in breathing, small reflex movements in hands, feet or face, and gut sounds [source: Doucette 2012].
    3. Use them to decide whether to hold a fulcrum, slow down or move on [source: Doucette 2012].
    4. Distinguish settling signs from distress: tearfulness, shaking, held breath, clenching or freezing call for a check-in, not more holding [synthesis].
  • Example language (illustrative): "I notice your breathing has changed. How are you doing right now?"
  • Watch for: reading every sign as positive. Working: you can describe afterwards what the client's body did and how you responded.

4.7 Re-evaluation

  • Purpose: check the effect of each fulcrum against the baseline [source: Doucette 2012].
  • Steps:
    1. Re-test the same joint for motion, play and end-feel [source: Doucette 2012].
    2. If changed, move to the next area; if not, consider another fulcrum or let it be [source: Doucette 2012; synthesis].
    3. Ask the client what they notice, briefly, without interrupting a settled state [synthesis].
  • Example language (illustrative): "I'm just checking that hip again. Anything feel different to you?"
  • Watch for: pressure to find change; repeated fulcrums in one area pushing past comfort. Working: a felt difference for you, the client, or both.

4.8 Half-moon vectors and the closing sequence

  • Purpose: these are taught parts of the ZB Core protocol [uncertain: not verified]. No steps are given; learn them in Core training only.
  • Steps: none given here [uncertain: not verified]. For the transition at the end of any session, see 4.9.
  • Example language (illustrative): "We're coming to the end of the hands-on part now."
  • Watch for: improvising techniques you have not been taught.

4.9 Ending the session and returning to the room

  • Purpose: bring the client from the relaxed or altered state that ZB sessions often produce [source: Doucette 2012; Bodywork Education Project] back to ordinary alertness before they leave or resume talk work [synthesis].
  • Steps [synthesis]:
    1. Tell the client the hands-on part is ending, then remove contact gently.
    2. Invite them to rest briefly, open their eyes, look around, move hands and feet.
    3. Help them sit up slowly at their own pace; check for light-headedness before they stand.
    4. Ask a brief orienting question (where they are, how they feel) before any discussion.
    5. Advise against driving straight away if they feel spacey.
  • Example language (illustrative): "I'm taking my hands away now. Take your time; when you're ready, open your eyes and have a look around the room. Sit up slowly."
  • Watch for: dizziness, persisting spaciness or derealisation, sudden emotion on sitting up. Working: the client is oriented, steady and able to speak about the session.

4.10 Responding to emotion, memory or altered states during the session

  • Purpose: ZB teachers describe the work as facilitating altered and expanded states of consciousness and the release of outmoded emotional patterns and trauma imprints [source: Bodywork Education Project; BTAC]; the founder's writing discusses memory held in the body [source: Redwing Books description of The Alchemy of Touch]. A ZB-published trauma-safety procedure is [uncertain: not verified], so the steps below are the psychotherapist's own [synthesis].
  • Steps [synthesis]:
    1. At the first sign of rising distress (tears, shaking, breath-holding, freezing, flashback language), lighten or pause contact and ask.
    2. Offer choices: continue, take hands off, sit up, open eyes.
    3. Ground in the present: feet on floor, name objects in the room, slow exhale.
    4. Titrate: return to touch only if the client wants it, at a less charged area, for a shorter hold.
    5. Do not push for memories or interpret meaning on the table; note content to explore later in talk sessions.
    6. If dissociation persists, stop bodywork for that session and use your usual stabilisation methods.
  • Example language (illustrative): "Something's coming up. I'm going to take my hands away for a moment. Can you feel your feet? Let's open your eyes and look at the window together."
  • Watch for: freeze or fawn responses that look like calm; abuse survivors who cannot say stop. Working: the client returns to the window of tolerance and feels in control of what happens next.

4.11 Hands-off alternative

  • Purpose: honour a client who declines touch, or a session in which touch is not appropriate [synthesis].
  • Steps [synthesis]:
    1. Offer seated or lying body-awareness work without contact: noticing weight through the bones of the pelvis and feet, breath, and the sense of support.
    2. Invite the client's own hands on their own body (e.g. hands resting on the hips) if they wish.
    3. Be clear that this is the clinician's adaptation, not ZB as taught.
  • Example language (illustrative): "We don't need any touch for this. If you like, let your attention go to where your body meets the chair and just notice the support."
  • Watch for: the client feeling they have 'failed' by declining touch. Working: choice feels real, and the alliance holds.

4.12 Integration in the talk session

  • Purpose: connect body experience with the client's psychotherapy goals [synthesis].
  • Steps [synthesis]:
    1. In the next talk session (or after orienting, if same session), ask what the client noticed during and since.
    2. Explore links to current themes, keeping the client's own meaning central; avoid interpreting sensations for them.
    3. Note any memories, emotions or shifts in self-perception and decide jointly how to work with them.
    4. Review whether bodywork is still serving the agreed goals.
  • Example language (illustrative): "Last time on the table you mentioned your shoulders felt lighter, and then you felt sad. What do you make of that now?"
  • Watch for: a client attributing all change to the bodywork and disengaging from therapy, or dependence on touch for regulation. Working: the client can use the experience in their own words and in daily life.

4.13 Referral to and coordination with a certified Zero Balancer

  • Purpose: the preferred route when you are not trained, or when you want to keep the psychotherapy frame touch-free [synthesis].
  • Steps [synthesis]:
    1. Check that the practitioner is ZBHA-certified (the title "Zero Balancer" is reserved for certified practitioners [source: Ryan 2009]) and licensed in their own field.
    2. With written consent, agree what will be shared and how often.
    3. Ask the client to tell you if anything in the bodywork felt uncomfortable or unsafe.
    4. Keep any physical symptoms routed to the client's doctor.
  • Example language (illustrative): "If you'd like to try Zero Balancing, I can give you the details of certified practitioners. With your permission I'd be glad to talk with them so the two pieces of work fit together."
  • Watch for: financial strain from paying for both; any practitioner making health claims or discouraging medical care. Working: the client feels supported by two coordinated practitioners.

4.14 Documentation and chaperoning

  • Purpose: protect client and clinician when touch is part of psychotherapy [synthesis]. The cited sources contain no professional-body chaperone guidance specific to ZB [uncertain]; follow your own board's rules on touch.
  • Steps [synthesis]:
    1. Record consent, areas touched, the client's responses, any stops, and the end-of-session state.
    2. Offer a chaperone or an open-door arrangement where the client or your board wishes it.
    3. Seek supervision from someone experienced in touch-based work.
  • Example language (illustrative): "Some people like to have someone else present for hands-on work. Would that feel better for you?"
  • Watch for: gaps in notes; unease you notice in yourself. Working: notes would let a colleague see exactly what happened and why.

5. Handling problems

Published ZB guidance on psychotherapy-specific problems is [uncertain: not verified]; apart from the items tagged with a source, the guidance below is [synthesis].

  • Client cannot relax on the table (guarding, chatter, constant checking): slow down, shorten holds, keep eyes-open and talk permitted; let the client choose where to start (feet are often less charged than the back). Working signs appearing is one sign of settling in ZB's terms [source: Doucette 2012]; do not chase them.
  • "Nothing happened": accept it without persuading. Review whether the client's goal fits a body-based method; ZB practitioners say effects can build over several days [source: Heart of Touch], so ask again next session, but do not promise effects.
  • Overwhelm, flashback or dissociation: follow 4.10; stop touch for the session if needed; afterwards review the trauma history, the window of tolerance and whether bodywork should pause until stabilisation work is done.
  • Touch-related rupture (client felt intruded on, confused or uncomfortable): name it, take responsibility, apologise for your part, ask what would have helped, and offer to stop touch entirely. Record it and take it to supervision.
  • Erotic or romantic transference, or the clinician's own arousal or attraction: stop hands-on work; address the feelings in talk or supervision; never continue touch while this is active. Touch is never sexual, and no intimate area is ever contacted.
  • Client wants more touch, or uses sessions mainly for comfort: explore the need (loneliness, self-soothing deficits); build self-regulation skills; consider referral to a separate bodyworker so therapy stays focused.
  • Non-adherence or missed bodywork sessions: explore ambivalence; ZB is optional and complementary, so the client can stop at any time without penalty.
  • Medical red flags (new pain, numbness, unexplained symptoms): stop, and refer to the client's doctor; ZB is not a treatment for physical disease. Practitioner-claimed benefits such as pain relief [source: ABMP] are not grounds to delay medical assessment.
  • Client gives up medical treatment or believes ZB will cure an illness: explore the belief respectfully, give the accurate evidence status, encourage keeping medical care, and with consent contact the doctor.
  • Client wants explanations in energy terms: describe ZB's concepts as ZB holds them (energy and structure, interface, fulcrum) without endorsing or dismissing them.
  • Departing from the protocol: ZB teachers discuss when deviation is appropriate [source: Hamwee 2020, abstract]; outside your training, prefer stopping over improvising.
  • Dual role and conflicts of interest: do not sell ZB packages or courses to therapy clients, and do not recruit clients into training. Keep fees and roles transparent. Check your own profession's ethics code on multiple relationships and conflicts of interest [synthesis].
  • Children, people with disabilities, pregnancy: ZB offers electives on children and on people with disabilities [source: Ryan 2009]; a psychotherapist should not give ZB to children or to people in these groups without that training, guardian consent plus the child's own assent, and any medical clearance needed. Follow safeguarding rules if anything of concern arises.
  • Client in a relationship with a ZB practitioner who makes them uneasy: take the concern seriously; support the client in deciding whether to continue; reporting routes are the practitioner's own licensing board and the certifying association (ZBHA).
  • Scope worries: check with your licensing board and your indemnity insurer before offering hands-on work.

Sources

Web sources:

Books (bibliographic details as listed by booksellers and teachers' pages):

  • Smith, Fritz Frederick. Inner Bridges: A Guide to Energy Movement and Body Structure. [uncertain: year and publisher not verified]
  • Smith, Fritz Frederick. The Alchemy of Touch: Moving Towards Mastery Through the Lens of Zero Balancing. Redwing Books listing, ISBN 978-0-9673034-6-8. [uncertain: year not verified]

Not covered by the sources above [uncertain]: the Zero Balancing Association's current detailed certification rules; which UK body certifies; the Core protocol details for half-moon vectors and closing; publisher and year of Smith's books.